Re: [neonixie-l] ScopeClock with teensy4.0

[Anders Mikkelsen]

To give some more context around some of the design decisions, I'll do a 
quick summary of the power supply design process here:

A main goal was to only use off-the-shelf magnetics. The transformer was 
chosen to have the highest available HV winding magnetizing inductance, to 
limit the reactive power in the Baxandall oscillator. Flyback transformers 
are deliberately wound to have a low magnetizing inductance, so they are 
not perfect for this application, but the chosen part works pretty well.

I originally looked at using the transformer in flyback mode, but this is 
not ideal for running voltage multipliers as the turn-on current in the 
switch (from charging the multiplier stack) is only limited by transformer 
leakage inductance, which interacts badly with peak current mode control. 
There are workarounds like using non-PCMC-controllers (as done in the 
original SCTV design), using fixed-on-time or hysteretic controllers, or 
filtering the current sense signal, but I wanted to explore something 
different. I had worries about startup behavior and control range in a 
self-oscillating design like this, but it behaves very well in my testing 
so far.

A cheap buck pre-regulator is used to control the secondary voltage. This 
part has not been fully tested yet, but the board has provisions for 
mixed-mode feedback to stabilize it if this turns out necessary. 

All voltages are doubler-derived to improve cross-regulation, to minimize 
focus variation when the cathode current (brightness) is adjusted. If a 
single secondary is used, this means more stages are needed for the PDA and 
cathode voltage multipliers, since the deflection voltage is limited to 300 
V in order to manage dissipation in the deflection amplifiers while 
maintaining acceptable slew rate. Luckily the transformer has a tapped 
secondary, so I can get 300 V for acceleration, and 550 V per stage in the 
other multipliers. 

One issue I found in my original design is that focus, brightness and 
astigmatism interact to a large degree. This turned out to have two main 
causes. One was sagging of the anode 2/4 voltage from the screen current, 
here I ended up buffering the astigmatism voltage with an emitter follower 
to make this supply stiffer while not having excessive dissipation in the 
potmeter. The second issue was that the cathode voltage moved around a lot 
relative to VG1 and focus due to the cathode being driven from a resistor 
chain. I originally expected that most of the cathode current would end up 
as beam current, but most of it actually goes to the control grid, as much 
as 90+ percent. This means that the cathode current was about 10 times 
higher than I expected. The trick here is to drive both the cathode and 
control grid from low impedance sources. Here I solved it with deriving the 
control grid voltage from a separate multiplier running off the filament 
supply, instead of the common divider chain that some other designs use.

Filament power is derived from another parallel transformer, I chose a gate 
drive transformer for its good isolation rating and low cost. I went with 
inductive current limiting on the secondary side for a few reasons. 1: it 
provides current limiting behavior during start-up, giving gentle warmup of 
the filament. 2: It allows easy selection of filament voltage by just 
changing the inductance without modifying the transfomers. 3: it allows the 
secondary voltage to be higher than the filament voltage, requiring less 
stages on the voltage multiplier in order to reach the target -Vg1 voltage. 
4: It provides some tank VARs to keep the Baxandall oscillator from 
dropping below the minimum required Q during startup with a cold filament.

The last trick is the -12 for the deflection amplifier constant current 
sinks. I played with different designs for the deflection amps, and found 
the simple long tailed pair with a CCS to work exceedingly well for its 
simplicity. The cheapest way I found of making the required negative rail 
for this was to make a capactive divider as part of the primary tank 
capacitance, and rectifying the voltage across the middle cap, which works 
fine since it's isolated by caps on both sides. It looks a bit funny, but 
works very well.

On Sunday, March 24, 2024 at 7:48:53 PM UTC+1 Anders Mikkelsen wrote:

> I know I'm a bit late in following up on this, but better late than never! 
> I got caught up in life and other projects as usual.
>
> I've put up some more photos and videos, plus some preliminary schematics 
> in this google album: https://photos.app.goo.gl/dzu7QLQbDr4ameMr8
>
>
> Best regards
>
> On Saturday, December 23, 2023 at 2:10:19 AM UTC+1 Max Di Noi wrote:
>
>> Actually, that code works well! I had a typo on a pin config. Seems to 
>> work well! Very pleased. I hope you find that snipped of code useful.
>>
>>
>> On 22 Dec 2023, at 17:58, Max DN  wrote:
>>
>>
>> Jörg,
>>
>> This is the code that I am using with DAC 4822 (similar to 4922 but with 
>> inte

Re: [neonixie-l] ScopeClock with teensy4.0

[Anders Mikkelsen]

I know I'm a bit late in following up on this, but better late than never! 
I got caught up in life and other projects as usual.

I've put up some more photos and videos, plus some preliminary schematics 
in this google album: https://photos.app.goo.gl/dzu7QLQbDr4ameMr8


Best regards

On Saturday, December 23, 2023 at 2:10:19 AM UTC+1 Max Di Noi wrote:

> Actually, that code works well! I had a typo on a pin config. Seems to 
> work well! Very pleased. I hope you find that snipped of code useful.
>
>
> On 22 Dec 2023, at 17:58, Max DN  wrote:
>
>
> Jörg,
>
> This is the code that I am using with DAC 4822 (similar to 4922 but with 
> internal ref.). I can generate some nice sinewaves with 1V or 2V amplitude 
> with the Teensy 4.1 powered by USB data cable and output displayed on my 
> Rigol oscilloscope.
>
> And of course, I can draw a circle.
>
> I think the code is as slim as can be, see below. However when I plug it 
> in the scope clock code, It doesn't seem to work well... I need to figure 
> it out.
>
>
> //code
> #include 
>
> //typedef unsigned int mcp4xxx_register; // 16-bit MCP48XX/MCP49XX 
> register for a single channel and 12-bit data
> //
> //const mcp4xxx_register mcp4xxx_channel_a =  0B; // for 
> all MCP4XXX
> //const mcp4xxx_register mcp4xxx_channel_b =  0B1000; // for 
> MCP4XX2 only
> //const mcp4xxx_register mcp4xxx_buffer_off = 0B; // for 
> all MCP4XXX
> //const mcp4xxx_register mcp4xxx_buffer_on  = 0B0100; // for 
> MCP49XX only
> //const mcp4xxx_register mcp4xxx_gain_two =   0B;
> //const mcp4xxx_register mcp4xxx_gain_one =   0B0010;
> //const mcp4xxx_register mcp4xxx_output_off = 0B;
> //const mcp4xxx_register mcp4xxx_output_on  = 0B0001;
> //
> //
> //const mcp4xxx_register mcp4822_channel_a = mcp4xxx_channel_a | 
> //   mcp4xxx_buffer_off | 
> //   mcp4xxx_gain_one | 
> //   mcp4xxx_output_on;
> //
> //const mcp4xxx_register mcp4822_channel_b = mcp4xxx_channel_b | 
> //   mcp4xxx_buffer_off | 
> //   mcp4xxx_gain_one | 
> //   mcp4xxx_output_on;
>
> const unsigned int  steps = 512;
>
> unsigned int sines_of_steps[steps]; // sine values scaled to 0 ... 4095 
> (2^12 - 1)
>
> const byte  DACCSPin   = 10;
>
> void setup()
> {
>int i;
>
>for (i = 0; i < steps; i++)
>{
>   sines_of_steps[i] = round((sin(TWO_PI / steps * i) + 1) * 2047.5);
>}
>
>pinMode(DACCSPin, OUTPUT);
>digitalWrite(DACCSPin, HIGH);
>
>SPI.begin();
> }
>
> void loop()
> {
>unsigned int  i;
>for (;;)
>{
>  for (i = 0; i < steps; i++)
>  {
> SPI.beginTransaction(SPISettings(2000, MSBFIRST, 
> SPI_MODE2));
>
> digitalWrite(DACCSPin, LOW);
> SPI.transfer16(0B0011 | sines_of_steps[i]);
> // bits: DAC channel A, buffer off, gain 1x 
> (Vout=VRef*D/4096), output on, 12-bit data (D)
> digitalWrite(DACCSPin, HIGH);
> 
> digitalWrite(DACCSPin, LOW);
> SPI.transfer16(0B1011 | sines_of_steps[steps - 1 - 
> i]);
> // bits: DAC channel B, buffer off, gain 1x 
> (Vout=VRef*D/4096), output on, 12-bit data (D)
> digitalWrite(DACCSPin, HIGH);
>
>SPI.endTransaction();
>  }
>
>}
> }
> Il giorno mercoledì 22 novembre 2023 alle 08:55:55 UTC jörg ha scritto:
>
>> Pretty nice photos.
>> I like it too, to disable blanking and to see the painting beam.
>> I did some tests with the MCP4922, too, but it was too slow for me.
>> Mabe you've found a better way (code) driving it. If you don't mind, I'm 
>> intersted in a code snipped and which lib you have used.
>> I ended up in a AD5344, which works pretty well for me on the 
>> teensy40/41). So maybe I will give the 4922 a second try.
>> And I'm curious about your powersupply approach. Especial the +-5V and 
>> noise. I'm using a switched one, which is too noisy.
>> Last, I'm in the same problem, getting a sharp image an tweaking with 
>> focus, astig etc. 
>> So, if you get good results with the emitter follower, please share your 
>> experience.
>> Cheers
>> Jörg
>>
>>
>>
>> On Monday, November 20, 2023 at 9:37:35 PM UTC+1 GDR GDR wrote:
>>
>>> wow! while the technical details are all "greek" to me, the images look 
>>> amazing. I love the "artifacts" in them. I dont know how you took these, 
>>> but it looks awesome! I like it as it is! not sure how this looks like in 
>>> "motion" but looks great in the stills... can you post some more? cheers
>>>
>>> On Sunday, November 19, 2023 at 4:25:50 PM UTC-6 Anders Mikkelsen wrote:
>>>
 I recently started playing with scope clocks again, aft

Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

Actually, that code works well! I had a typo on a pin config. Seems to work 
well! Very pleased. I hope you find that snipped of code useful.


> On 22 Dec 2023, at 17:58, Max DN  wrote:
> 
> 
> Jörg,
> 
> This is the code that I am using with DAC 4822 (similar to 4922 but with 
> internal ref.). I can generate some nice sinewaves with 1V or 2V amplitude 
> with the Teensy 4.1 powered by USB data cable and output displayed on my 
> Rigol oscilloscope.
> 
> And of course, I can draw a circle.
> 
> I think the code is as slim as can be, see below. However when I plug it in 
> the scope clock code, It doesn't seem to work well... I need to figure it out.
> 
> 
> //code
> #include 
> 
> //typedef unsigned int mcp4xxx_register; // 16-bit MCP48XX/MCP49XX register 
> for a single channel and 12-bit data
> //
> //const mcp4xxx_register mcp4xxx_channel_a =  0B; // for all 
> MCP4XXX
> //const mcp4xxx_register mcp4xxx_channel_b =  0B1000; // for 
> MCP4XX2 only
> //const mcp4xxx_register mcp4xxx_buffer_off = 0B; // for all 
> MCP4XXX
> //const mcp4xxx_register mcp4xxx_buffer_on  = 0B0100; // for 
> MCP49XX only
> //const mcp4xxx_register mcp4xxx_gain_two =   0B;
> //const mcp4xxx_register mcp4xxx_gain_one =   0B0010;
> //const mcp4xxx_register mcp4xxx_output_off = 0B;
> //const mcp4xxx_register mcp4xxx_output_on  = 0B0001;
> //
> //
> //const mcp4xxx_register mcp4822_channel_a = mcp4xxx_channel_a | 
> //   mcp4xxx_buffer_off | 
> //   mcp4xxx_gain_one | 
> //   mcp4xxx_output_on;
> //
> //const mcp4xxx_register mcp4822_channel_b = mcp4xxx_channel_b | 
> //   mcp4xxx_buffer_off | 
> //   mcp4xxx_gain_one | 
> //   mcp4xxx_output_on;
> 
> const unsigned int  steps = 512;
> 
> unsigned int sines_of_steps[steps]; // sine values scaled to 0 ... 4095 (2^12 
> - 1)
> 
> const byte  DACCSPin   = 10;
> 
> void setup()
> {
>int i;
> 
>for (i = 0; i < steps; i++)
>{
>   sines_of_steps[i] = round((sin(TWO_PI / steps * i) + 1) * 2047.5);
>}
>
>pinMode(DACCSPin, OUTPUT);
>digitalWrite(DACCSPin, HIGH);
> 
>SPI.begin();
> }
> 
> void loop()
> {
>unsigned int  i;
>for (;;)
>{
>  for (i = 0; i < steps; i++)
>  {
> SPI.beginTransaction(SPISettings(2000, MSBFIRST, SPI_MODE2));
> 
> digitalWrite(DACCSPin, LOW);
> SPI.transfer16(0B0011 | sines_of_steps[i]);
> // bits: DAC channel A, buffer off, gain 1x (Vout=VRef*D/4096), 
> output on, 12-bit data (D)
> digitalWrite(DACCSPin, HIGH);
> 
> digitalWrite(DACCSPin, LOW);
> SPI.transfer16(0B1011 | sines_of_steps[steps - 1 - 
> i]);
> // bits: DAC channel B, buffer off, gain 1x (Vout=VRef*D/4096), 
> output on, 12-bit data (D)
> digitalWrite(DACCSPin, HIGH);
> 
>SPI.endTransaction();
>  }
>
>}
> }
> Il giorno mercoledì 22 novembre 2023 alle 08:55:55 UTC jörg ha scritto:
> Pretty nice photos.
> I like it too, to disable blanking and to see the painting beam.
> I did some tests with the MCP4922, too, but it was too slow for me.
> Mabe you've found a better way (code) driving it. If you don't mind, I'm 
> intersted in a code snipped and which lib you have used.
> I ended up in a AD5344, which works pretty well for me on the teensy40/41). 
> So maybe I will give the 4922 a second try.
> And I'm curious about your powersupply approach. Especial the +-5V and noise. 
> I'm using a switched one, which is too noisy.
> Last, I'm in the same problem, getting a sharp image an tweaking with focus, 
> astig etc. 
> So, if you get good results with the emitter follower, please share your 
> experience.
> Cheers
> Jörg
> 
> 
> 
> On Monday, November 20, 2023 at 9:37:35 PM UTC+1 GDR GDR wrote:
> wow! while the technical details are all "greek" to me, the images look 
> amazing. I love the "artifacts" in them. I dont know how you took these, but 
> it looks awesome! I like it as it is! not sure how this looks like in 
> "motion" but looks great in the stills... can you post some more? cheers
> 
> On Sunday, November 19, 2023 at 4:25:50 PM UTC-6 Anders Mikkelsen wrote:
> I recently started playing with scope clocks again, after seeing David's 
> circle graphics clock the better part of two decades ago and having had it in 
> the back of my mind since. This was prompted by Teensy 4.1 becoming available 
> again on the market, and the official port of the SCTV codebase for this 
> platform. I got it up and running, and explored some aspects around the 
> design, I thought I'd share some info with the group in c

Re: [neonixie-l] ScopeClock with teensy4.0

[Max DN]

Jörg,

This is the code that I am using with DAC 4822 (similar to 4922 but with 
internal ref.). I can generate some nice sinewaves with 1V or 2V amplitude 
with the Teensy 4.1 powered by USB data cable and output displayed on my 
Rigol oscilloscope.

And of course, I can draw a circle.

I think the code is as slim as can be, see below. However when I plug it in 
the scope clock code, It doesn't seem to work well... I need to figure it 
out.


//code
#include 

//typedef unsigned int mcp4xxx_register; // 16-bit MCP48XX/MCP49XX register 
for a single channel and 12-bit data
//
//const mcp4xxx_register mcp4xxx_channel_a =  0B; // for 
all MCP4XXX
//const mcp4xxx_register mcp4xxx_channel_b =  0B1000; // for 
MCP4XX2 only
//const mcp4xxx_register mcp4xxx_buffer_off = 0B; // for 
all MCP4XXX
//const mcp4xxx_register mcp4xxx_buffer_on  = 0B0100; // for 
MCP49XX only
//const mcp4xxx_register mcp4xxx_gain_two =   0B;
//const mcp4xxx_register mcp4xxx_gain_one =   0B0010;
//const mcp4xxx_register mcp4xxx_output_off = 0B;
//const mcp4xxx_register mcp4xxx_output_on  = 0B0001;
//
//
//const mcp4xxx_register mcp4822_channel_a = mcp4xxx_channel_a | 
//   mcp4xxx_buffer_off | 
//   mcp4xxx_gain_one | 
//   mcp4xxx_output_on;
//
//const mcp4xxx_register mcp4822_channel_b = mcp4xxx_channel_b | 
//   mcp4xxx_buffer_off | 
//   mcp4xxx_gain_one | 
//   mcp4xxx_output_on;

const unsigned int  steps = 512;

unsigned int sines_of_steps[steps]; // sine values scaled to 0 ... 4095 
(2^12 - 1)

const byte  DACCSPin   = 10;

void setup()
{
   int i;

   for (i = 0; i < steps; i++)
   {
  sines_of_steps[i] = round((sin(TWO_PI / steps * i) + 1) * 2047.5);
   }
   
   pinMode(DACCSPin, OUTPUT);
   digitalWrite(DACCSPin, HIGH);

   SPI.begin();
}

void loop()
{
   unsigned int  i;
   for (;;)
   {
 for (i = 0; i < steps; i++)
 {
SPI.beginTransaction(SPISettings(2000, MSBFIRST, 
SPI_MODE2));

digitalWrite(DACCSPin, LOW);
SPI.transfer16(0B0011 | sines_of_steps[i]);
// bits: DAC channel A, buffer off, gain 1x (Vout=VRef*D/4096), 
output on, 12-bit data (D)
digitalWrite(DACCSPin, HIGH);

digitalWrite(DACCSPin, LOW);
SPI.transfer16(0B1011 | sines_of_steps[steps - 1 - 
i]);
// bits: DAC channel B, buffer off, gain 1x (Vout=VRef*D/4096), 
output on, 12-bit data (D)
digitalWrite(DACCSPin, HIGH);

   SPI.endTransaction();
 }
   
   }
}
Il giorno mercoledì 22 novembre 2023 alle 08:55:55 UTC jörg ha scritto:

> Pretty nice photos.
> I like it too, to disable blanking and to see the painting beam.
> I did some tests with the MCP4922, too, but it was too slow for me.
> Mabe you've found a better way (code) driving it. If you don't mind, I'm 
> intersted in a code snipped and which lib you have used.
> I ended up in a AD5344, which works pretty well for me on the 
> teensy40/41). So maybe I will give the 4922 a second try.
> And I'm curious about your powersupply approach. Especial the +-5V and 
> noise. I'm using a switched one, which is too noisy.
> Last, I'm in the same problem, getting a sharp image an tweaking with 
> focus, astig etc. 
> So, if you get good results with the emitter follower, please share your 
> experience.
> Cheers
> Jörg
>
>
>
> On Monday, November 20, 2023 at 9:37:35 PM UTC+1 GDR GDR wrote:
>
>> wow! while the technical details are all "greek" to me, the images look 
>> amazing. I love the "artifacts" in them. I dont know how you took these, 
>> but it looks awesome! I like it as it is! not sure how this looks like in 
>> "motion" but looks great in the stills... can you post some more? cheers
>>
>> On Sunday, November 19, 2023 at 4:25:50 PM UTC-6 Anders Mikkelsen wrote:
>>
>>> I recently started playing with scope clocks again, after seeing David's 
>>> circle graphics clock the better part of two decades ago and having had it 
>>> in the back of my mind since. This was prompted by Teensy 4.1 becoming 
>>> available again on the market, and the official port of the SCTV codebase 
>>> for this platform. I got it up and running, and explored some aspects 
>>> around the design, I thought I'd share some info with the group in case 
>>> anybody else can benefit from it.
>>>
>>> Firstly, off-the-shelf flyback transformers for low power auxiliary 
>>> supplies work very well in Baxandall oscillators to make the required 
>>> voltages at minimal cost and complexity, without using any custom parts. I 
>>> used a Wurth 750310787, but many others are available. A buck converter can 

Re: [neonixie-l] ScopeClock with teensy4.0

[jörg]

Pretty nice photos.
I like it too, to disable blanking and to see the painting beam.
I did some tests with the MCP4922, too, but it was too slow for me.
Mabe you've found a better way (code) driving it. If you don't mind, I'm 
intersted in a code snipped and which lib you have used.
I ended up in a AD5344, which works pretty well for me on the teensy40/41). 
So maybe I will give the 4922 a second try.
And I'm curious about your powersupply approach. Especial the +-5V and 
noise. I'm using a switched one, which is too noisy.
Last, I'm in the same problem, getting a sharp image an tweaking with 
focus, astig etc. 
So, if you get good results with the emitter follower, please share your 
experience.
Cheers
Jörg



On Monday, November 20, 2023 at 9:37:35 PM UTC+1 GDR GDR wrote:

> wow! while the technical details are all "greek" to me, the images look 
> amazing. I love the "artifacts" in them. I dont know how you took these, 
> but it looks awesome! I like it as it is! not sure how this looks like in 
> "motion" but looks great in the stills... can you post some more? cheers
>
> On Sunday, November 19, 2023 at 4:25:50 PM UTC-6 Anders Mikkelsen wrote:
>
>> I recently started playing with scope clocks again, after seeing David's 
>> circle graphics clock the better part of two decades ago and having had it 
>> in the back of my mind since. This was prompted by Teensy 4.1 becoming 
>> available again on the market, and the official port of the SCTV codebase 
>> for this platform. I got it up and running, and explored some aspects 
>> around the design, I thought I'd share some info with the group in case 
>> anybody else can benefit from it.
>>
>> Firstly, off-the-shelf flyback transformers for low power auxiliary 
>> supplies work very well in Baxandall oscillators to make the required 
>> voltages at minimal cost and complexity, without using any custom parts. I 
>> used a Wurth 750310787, but many others are available. A buck converter can 
>> be wrapped around the circuit to get good line and load regulation, and the 
>> resulting BOM cost is less than 5 bucks. An off-the-shelf gate drive 
>> transformer can be used to drive the filament, providing the required 
>> isolation and power handling for a few bucks more, making a very simple and 
>> cheap design. 
>>
>> Secondly, the LT DAC in the design can be replaced by a much more 
>> affordable (and easy to solder) MCP4922, without taking a hit on the DAC 
>> update rate. A comparison of the two parts would suggest that the 20 MHz 
>> maximum SPI rate of this part would significantly impact performance, but 
>> in practice it ends up working at around 500 KSPS as well. The issue with 
>> the original part is that it relies on 24 bit SPI transfers, which are 
>> again implemented as an 8 bit and a 16 bit transfer, and the overhead from 
>> reconfiguring the SPI peripheral and waiting for the receive buffer to fill 
>> is significant. The MCP allows native 16 bit operation of the peripheral, 
>> and use of the transmit FIFO to make the transfers without any intervention 
>> from the firmware once a set of XY coordinates are passed. I also 
>> experimented with porting the code to run on an RP2040, which works well so 
>> far. I haven't assembled the RTC part yet, but everything else seems to 
>> work with minimal changes to the code. The biggest effort was figuring out 
>> how to do efficient SPI transfers, which required some raw register access, 
>> and clock tree reconfiguration for synchronous operation of the SPI 
>> peripheral (which is not the case with the Arduino default clock frequency 
>> for this board). 
>>
>> Thirdly, I did struggle a lot with getting a sharp image without having a 
>> lot of interaction between focus, brightness and astigmatism. Part of it 
>> came from feeding the cathode from a high impedance point in the divider, 
>> but a major factor turned out to be the source impedance of the anode 
>> drive. Most circuits I've seen drive the anode from a potentiometer fed 
>> from the deflection design. Most CRTs seem to draw an anode current that's 
>> significantly higher than the screen current, often by an order of 
>> magnitude, and this current causes the anode voltage to drift around as the 
>> brightness is adjusted. I initially used the high value of 1 Mohm for the 
>> pot, which exaggerated this issue a bit as well. In electrostatic CRTs, the 
>> final anode together with the first set of deflection plates forms a 
>> cylindrical lens, that affects both image geometry and beam focus. I looked 
>> at some oscilloscope schematics, and found some that use an emitter 
>> follower to buffer the output of the astigmatism pot to deal with this, and 
>> I'm just waiting for some parts in order to try this out in my design. 
>>
>> I tried it with a range of old CRTs, and most of them struggle with 
>> getting a sharp dot near the edges of the screen. I suspect this is partly 
>> due to my sagging voltages, but I'll see if the improvement

Re: [neonixie-l] ScopeClock with teensy4.0

[GDR GDR]

wow! while the technical details are all "greek" to me, the images look 
amazing. I love the "artifacts" in them. I dont know how you took these, 
but it looks awesome! I like it as it is! not sure how this looks like in 
"motion" but looks great in the stills... can you post some more? cheers

On Sunday, November 19, 2023 at 4:25:50 PM UTC-6 Anders Mikkelsen wrote:

> I recently started playing with scope clocks again, after seeing David's 
> circle graphics clock the better part of two decades ago and having had it 
> in the back of my mind since. This was prompted by Teensy 4.1 becoming 
> available again on the market, and the official port of the SCTV codebase 
> for this platform. I got it up and running, and explored some aspects 
> around the design, I thought I'd share some info with the group in case 
> anybody else can benefit from it.
>
> Firstly, off-the-shelf flyback transformers for low power auxiliary 
> supplies work very well in Baxandall oscillators to make the required 
> voltages at minimal cost and complexity, without using any custom parts. I 
> used a Wurth 750310787, but many others are available. A buck converter can 
> be wrapped around the circuit to get good line and load regulation, and the 
> resulting BOM cost is less than 5 bucks. An off-the-shelf gate drive 
> transformer can be used to drive the filament, providing the required 
> isolation and power handling for a few bucks more, making a very simple and 
> cheap design. 
>
> Secondly, the LT DAC in the design can be replaced by a much more 
> affordable (and easy to solder) MCP4922, without taking a hit on the DAC 
> update rate. A comparison of the two parts would suggest that the 20 MHz 
> maximum SPI rate of this part would significantly impact performance, but 
> in practice it ends up working at around 500 KSPS as well. The issue with 
> the original part is that it relies on 24 bit SPI transfers, which are 
> again implemented as an 8 bit and a 16 bit transfer, and the overhead from 
> reconfiguring the SPI peripheral and waiting for the receive buffer to fill 
> is significant. The MCP allows native 16 bit operation of the peripheral, 
> and use of the transmit FIFO to make the transfers without any intervention 
> from the firmware once a set of XY coordinates are passed. I also 
> experimented with porting the code to run on an RP2040, which works well so 
> far. I haven't assembled the RTC part yet, but everything else seems to 
> work with minimal changes to the code. The biggest effort was figuring out 
> how to do efficient SPI transfers, which required some raw register access, 
> and clock tree reconfiguration for synchronous operation of the SPI 
> peripheral (which is not the case with the Arduino default clock frequency 
> for this board). 
>
> Thirdly, I did struggle a lot with getting a sharp image without having a 
> lot of interaction between focus, brightness and astigmatism. Part of it 
> came from feeding the cathode from a high impedance point in the divider, 
> but a major factor turned out to be the source impedance of the anode 
> drive. Most circuits I've seen drive the anode from a potentiometer fed 
> from the deflection design. Most CRTs seem to draw an anode current that's 
> significantly higher than the screen current, often by an order of 
> magnitude, and this current causes the anode voltage to drift around as the 
> brightness is adjusted. I initially used the high value of 1 Mohm for the 
> pot, which exaggerated this issue a bit as well. In electrostatic CRTs, the 
> final anode together with the first set of deflection plates forms a 
> cylindrical lens, that affects both image geometry and beam focus. I looked 
> at some oscilloscope schematics, and found some that use an emitter 
> follower to buffer the output of the astigmatism pot to deal with this, and 
> I'm just waiting for some parts in order to try this out in my design. 
>
> I tried it with a range of old CRTs, and most of them struggle with 
> getting a sharp dot near the edges of the screen. I suspect this is partly 
> due to my sagging voltages, but I'll see if the improvements address it. 
> Does anybody know what to expect in terms of corner spot size for typical 
> non-PDA electrostatic CRTs in the range of 30 - 100 mm screen diameter? 
> This is at 1200 V, and with enough beam current to make the scope clock 
> image readable in a room with normal indoor lighting.
>
> Some pictures attached in order to compensate for all the words.
>
> AM
>

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Re: [neonixie-l] ScopeClock with teensy4.0

[Max DN]

Just to take a quick victory lap to celebrate how beautiful scope clocks 
can be!

And to thanks all of those who has helped me to get there, especially Jörg 
and Grahame!

https://youtube.com/shorts/cXWgcxxiqfA

Enjoy!


Il giorno mercoledì 30 agosto 2023 alle 14:59:22 UTC+1 Toby Thain ha 
scritto:

> On 2023-08-30 3:30 a.m., jörg wrote:
> > So you got it finally. Congratulation!
> > If you want some chaos on your screen. Drop me a mail, I'll send you the 
> > code.
> > 
> > https://www.youtube.com/watch?v=xHd83pm7ea4
> > 
>
> It's also possible to build an analog computer for the Lorenz attractor. 
> I have built Horowitz' version, e.g. 
> https://www.chaotic-circuits.com/10-creating-lorenz-butterfly/
>
> Video by Horowitz at https://youtu.be/DBteowmSN8g
>
> --Toby
>

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Re: [neonixie-l] ScopeClock with teensy4.0

[Postert]

n <artg...@gmail.com>
  
  Date: 10/06/2023 17:17
    (GMT+00:00) 
  To: neoni...@googlegroups.com
  
  Subject: Re: [neonixie-l]
ScopeClock with teensy4.0 
  
  

I think I have an
  unused teensy 3.6. 
  It may take some time to
track it down but I'd
happily swap it for a 4.1 if
that simplifies things for
you.



  On Sat, Jun 10,
2023 at 5:03 PM David Forbes
<nixie...@gmail.com>
wrote:
  
  

  Here is the schematic
of the SCTV rev E, which
uses the Teensy 4.1. 
  
  
  



  On Sat, Jun
10, 2023 at 8:51 AM Max
Di Noi <flata...@gmail.com>
wrote:
  
  
Thanks for your
  prompt reply David.
  
  
  I have already
printed my board for
a Teensy 3.6. I have
no issues soldering
tiny smd components
assuming that I can
get an LTC22632! I
may design a small
PCB to super-impose
the Teensy 4.1 over
the existing
footprint and
layout. In doing so,
I could add the dual
DAC on this new
adapter board. I can
see CS is connected
to pin10 but where
are CLK and SDI of
the LTC2632
connected? I don’t
see them in the
code. Yes, It would
be great if you
could post diagram
for SCTV-E for
Teensy 4.1 please.
  
  
  Interesting that
you are redesigning
the transformer. I
managed to hand-wire
mine and seems to
work well. The 6.3V

Re: [neonixie-l] ScopeClock with teensy4.0

[jörg]

rt ha 
>>>>> scritto:
>>>>>
>>>>>> Sounds like the CRT-related stuff is fine (congratulations, BTW), and 
>>>>>> you have issues with the DAC. Have you checked the linearity of the DAC 
>>>>>> ? 
>>>>>> The best way to start is to run all DAC codes, starting from 0 and 
>>>>>> incrementing to the top, and verify the waveform is a stair-step. I 
>>>>>> suggest 
>>>>>> leaving each value for about 10usec to allow more than enough time for 
>>>>>> the 
>>>>>> DAC and amplifiers to settle. Which DAC are you using ? My only 
>>>>>> experience 
>>>>>> is with 8-bit parallel-input DACs, and I had no problems with it (ADCs, 
>>>>>> on 
>>>>>> the other hand, are a different story). If you see erratic behavior, 
>>>>>> post the findings and we can figure out next steps. 
>>>>>>
>>>>>> If the DAC is operating correctly, then my first suspect is the 
>>>>>> range/offset of your DAC. You might not be able to drive it rail-to-rail 
>>>>>> due to the design of the level-shifters/deflection amps. In that case, 
>>>>>> try 
>>>>>> to narrow-down the range where the DAC is driving the CRT as-expected.
>>>>>>
>>>>>> On Sunday, July 9, 2023 at 3:42:21 AM UTC-7 Max Di Noi wrote:
>>>>>>
>>>>>>> Hey, Adrian, let me knew if you find that Teensy 3.6. 
>>>>>>>
>>>>>>>
>>>>>>> I'm not having much luck with a teensy 4.1 + external DAC using SPI. 
>>>>>>> Nor I can see any issues at all in the code. 
>>>>>>> The connections are simple enough but it cannot draw a circle (as a 
>>>>>>> test) on my CRT using the open source code that Cathode Corner 
>>>>>>> published. 
>>>>>>> Indeed, when I test the DAC output on the oscilloscope looks irregular, 
>>>>>>> whereas the SPI lines seems to behave as expected. Odd. 
>>>>>>>
>>>>>>> If I input two sine waves into the deflection amplifiers using my 
>>>>>>> signal generator, then I can get a circle on the CRT, that proves that 
>>>>>>> power supply, level shifters and deflection amplifiers should be fine. 
>>>>>>>
>>>>>>>  Original message 
>>>>>>> From: Adrian Godwin  
>>>>>>> Date: 10/06/2023 17:17 (GMT+00:00) 
>>>>>>> To: neoni...@googlegroups.com 
>>>>>>> Subject: Re: [neonixie-l] ScopeClock with teensy4.0 
>>>>>>>
>>>>>>> I think I have an unused teensy 3.6.  
>>>>>>> It may take some time to track it down but I'd happily swap it for a 
>>>>>>> 4.1 if that simplifies things for you.
>>>>>>>
>>>>>>> On Sat, Jun 10, 2023 at 5:03 PM David Forbes  
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Here is the schematic of the SCTV rev E, which uses the Teensy 4.1. 
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi  
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Thanks for your prompt reply David. 
>>>>>>>>>
>>>>>>>>> I have already printed my board for a Teensy 3.6. I have no issues 
>>>>>>>>> soldering tiny smd components assuming that I can get an LTC22632! I 
>>>>>>>>> may 
>>>>>>>>> design a small PCB to super-impose the Teensy 4.1 over the existing 
>>>>>>>>> footprint and layout. In doing so, I could add the dual DAC on this 
>>>>>>>>> new 
>>>>>>>>> adapter board. I can see CS is connected to pin10 but where are CLK 
>>>>>>>>> and SDI 
>>>>>>>>> of the LTC2632 connected? I don’t see them in the code. Yes, It would 
>>>>>>>>> be 
>>>>>>>>> great if you could post diagram for SCTV-E for Teensy 4.1 please.
>>>>>>>>>
>>>>>>>>> Interesting that you are redesigning the transformer. I managed to 
>>>&g

Re: [neonixie-l] ScopeClock with teensy4.0

['Grahame' via neonixie-l]

ular, whereas
the SPI lines seems to behave as expected. Odd.

If I input two sine waves into the deflection amplifiers
using my signal generator, then I can get a circle on the
CRT, that proves that power supply, level shifters and
deflection amplifiers should be fine.

 Original message 
From: Adrian Godwin 
Date: 10/06/2023 17:17 (GMT+00:00)
To: neoni...@googlegroups.com
Subject: Re: [neonixie-l] ScopeClock with teensy4.0

I think I have an unused teensy 3.6.
It may take some time to track it down but I'd happily
swap it for a 4.1 if that simplifies things for you.

On Sat, Jun 10, 2023 at 5:03 PM David Forbes
 wrote:

Here is the schematic of the SCTV rev E, which uses
the Teensy 4.1.


On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi
 wrote:

Thanks for your prompt reply David.

I have already printed my board for a Teensy 3.6.
I have no issues soldering tiny smd components
assuming that I can get an LTC22632! I may design
a small PCB to super-impose the Teensy 4.1 over
the existing footprint and layout. In doing so, I
could add the dual DAC on this new adapter board.
I can see CS is connected to pin10 but where are
CLK and SDI of the LTC2632 connected? I don’t see
them in the code. Yes, It would be great if you
could post diagram for SCTV-E for Teensy 4.1 please.

Interesting that you are redesigning the
transformer. I managed to hand-wire mine and
seems to work well. The 6.3V for the heater is
the one that I’m not too sure how to calibrate
exactly, since the SMPS… It shines a bit too
bright at the moment and voltage drops to 2V, so
that’s not healthy for the heater filament. I can
remove a few turns but not sure what is the
‘exact’ RMS V I’m looking for given the spikes of
the SMPS at 100Khz, I’ll continue to experiment
on that using a 6.2V 500mA lightbulb to avoid
damaging the CRT.

Thanks again for updating the schematic when you
get a chance, it’ll save me so much time to
experiment.




On 10 Jun 2023, at 16:41, David Forbes
 wrote:

Hi. The SCTV with the Teensy 4.0 uses an LTC2632
dual DAC. This uses SPI to load the X and Y
values. It's about half the update rate of the
built-in DACs in the previous Teensy 3.6, so I
had to change the step size in the drawing
routines.
Unfortunately this chip is tiny, so it's hard to
solder.
I am in the process of redesigning the
transformer and circuit board to be more
friendly for kit and DIY use. I want to make the
PC board with through hole parts, since people
enjoy soldering those together.
I will see if I can post the latest SCTV
schematic diagram to my website today. I've been
traveling a lot lately.


On Sat, Jun 10, 2023, 6:33 AM Max DN
 wrote:

True, but the schematic is SCTV rev. C which
is for Teensy 3.6. Does anyone have the
schematic for using Teensy 4.1? Just
designed a clock based on SCTV-rev and
custom transformer but of course I have now
realised that Teensy 3.6 is impossible to get...

Il giorno sabato 11 marzo 2023 alle 18:41:05
UTC SD ha scritto:

David Forbes has the schematic on his
website, and the firmware on Github.  I
did not see that Jörg was making kits,
in fact he said he didn't want to make
kits, but perhaps make a PCB available,
so I do not know why people are asking
for kits.

On Friday, March 10, 2023 at 3:42:49 PM
UTC-5 liam bartosiewicz wrote:

The schematic and 

Re: [neonixie-l] ScopeClock with teensy4.0

['Grahame' via neonixie-l]

Hi

Is that image of the face - showing the image offset twice in the X 
direction only - what you see with your eyes or is it a camera artefact?


If it is real, what happens when you rotate the tube?

It is interesting that it seems to occur in the X direction only. If you 
feed the X and Y data from the DACs into a scope in XY mode do you see a 
good image or this offset one.


Do you have any strong alternating magnetic fields near by? example 
soldering iron base station...


Grahame

On 27/08/2023 01:31, Max DN wrote:

Ok, I'm back. Been busy with work.

I managed to purchase a Teensy 3.6 and I have the scope clock running. 
For some reason, I am not able to get a crisp picture, no matter how 
much I try to balance focus vs astigmatism vs brightness.


Could it be that my hand-wound transformer is creating some noise? 
It's quite a complex transformer (at least for me). I guess I could 
check the voltages with the oscilloscope but I worry that I 
accidentally put 1200V on the oscilloscope.  I'm using the schematic 
published by David at Cathode Corner, I built the transformer by trial 
and error. For the heather I'm using a stabilised 6.4VDC using a 
buck-converter, which I thought should help, but no!


Any suggestions on how to stability the picture? Attached a couple of 
photos.


Il giorno lunedì 10 luglio 2023 alle 16:54:15 UTC+1 gregebert ha scritto:

Sounds like the CRT-related stuff is fine (congratulations, BTW),
and you have issues with the DAC. Have you checked the linearity
of the DAC ? The best way to start is to run all DAC codes,
starting from 0 and incrementing to the top, and verify the
waveform is a stair-step. I suggest leaving each value for about
10usec to allow more than enough time for the DAC and amplifiers
to settle. Which DAC are you using ? My only experience is with
8-bit parallel-input DACs, and I had no problems with it (ADCs, on
the other hand, are a different story). If you see erratic
behavior, post the findings and we can figure out next steps.

If the DAC is operating correctly, then my first suspect is the
range/offset of your DAC. You might not be able to drive it
rail-to-rail due to the design of the level-shifters/deflection
amps. In that case, try to narrow-down the range where the DAC is
driving the CRT as-expected.

On Sunday, July 9, 2023 at 3:42:21 AM UTC-7 Max Di Noi wrote:

Hey, Adrian, let me knew if you find that Teensy 3.6.


I'm not having much luck with a teensy 4.1 + external DAC
using SPI. Nor I can see any issues at all in the code.
The connections are simple enough but it cannot draw a circle
(as a test) on my CRT using the open source code that Cathode
Corner published. Indeed, when I test the DAC output on the
oscilloscope looks irregular, whereas the SPI lines seems to
behave as expected. Odd.

If I input two sine waves into the deflection amplifiers using
my signal generator, then I can get a circle on the CRT, that
proves that power supply, level shifters and deflection
amplifiers should be fine.

 Original message 
From: Adrian Godwin 
Date: 10/06/2023 17:17 (GMT+00:00)
To: neoni...@googlegroups.com
    Subject: Re: [neonixie-l] ScopeClock with teensy4.0

I think I have an unused teensy 3.6.
It may take some time to track it down but I'd happily swap it
for a 4.1 if that simplifies things for you.

On Sat, Jun 10, 2023 at 5:03 PM David Forbes
 wrote:

Here is the schematic of the SCTV rev E, which uses the
Teensy 4.1.


On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi
 wrote:

Thanks for your prompt reply David.

I have already printed my board for a Teensy 3.6. I
have no issues soldering tiny smd components assuming
that I can get an LTC22632! I may design a small PCB
to super-impose the Teensy 4.1 over the existing
footprint and layout. In doing so, I could add the
dual DAC on this new adapter board. I can see CS is
connected to pin10 but where are CLK and SDI of the
LTC2632 connected? I don’t see them in the code. Yes,
It would be great if you could post diagram for SCTV-E
for Teensy 4.1 please.

Interesting that you are redesigning the transformer.
I managed to hand-wire mine and seems to work well.
The 6.3V for the heater is the one that I’m not too
sure how to calibrate exactly, since the SMPS… It
shines a bit too bright at the moment and voltage
drops to 2V, so that’s not healthy for the heater
filament. I can remove

Re: [neonixie-l] ScopeClock with teensy4.0

[gregebert]

Sounds like the CRT-related stuff is fine (congratulations, BTW), and you 
have issues with the DAC. Have you checked the linearity of the DAC ? The 
best way to start is to run all DAC codes, starting from 0 and incrementing 
to the top, and verify the waveform is a stair-step. I suggest leaving each 
value for about 10usec to allow more than enough time for the DAC and 
amplifiers to settle. Which DAC are you using ? My only experience is with 
8-bit parallel-input DACs, and I had no problems with it (ADCs, on the 
other hand, are a different story). If you see erratic behavior, post 
the findings and we can figure out next steps.

If the DAC is operating correctly, then my first suspect is the 
range/offset of your DAC. You might not be able to drive it rail-to-rail 
due to the design of the level-shifters/deflection amps. In that case, try 
to narrow-down the range where the DAC is driving the CRT as-expected.

On Sunday, July 9, 2023 at 3:42:21 AM UTC-7 Max Di Noi wrote:

> Hey, Adrian, let me knew if you find that Teensy 3.6.
>
>
> I'm not having much luck with a teensy 4.1 + external DAC using SPI. Nor I 
> can see any issues at all in the code. 
> The connections are simple enough but it cannot draw a circle (as a test) 
> on my CRT using the open source code that Cathode Corner published. Indeed, 
> when I test the DAC output on the oscilloscope looks irregular, whereas the 
> SPI lines seems to behave as expected. Odd. 
>
> If I input two sine waves into the deflection amplifiers using my signal 
> generator, then I can get a circle on the CRT, that proves that power 
> supply, level shifters and deflection amplifiers should be fine. 
>
>  Original message 
> From: Adrian Godwin  
> Date: 10/06/2023 17:17 (GMT+00:00) 
> To: neoni...@googlegroups.com 
> Subject: Re: [neonixie-l] ScopeClock with teensy4.0 
>
> I think I have an unused teensy 3.6. 
> It may take some time to track it down but I'd happily swap it for a 4.1 
> if that simplifies things for you.
>
> On Sat, Jun 10, 2023 at 5:03 PM David Forbes  wrote:
>
>> Here is the schematic of the SCTV rev E, which uses the Teensy 4.1. 
>>
>>
>> On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi  wrote:
>>
>>> Thanks for your prompt reply David.
>>>
>>> I have already printed my board for a Teensy 3.6. I have no issues 
>>> soldering tiny smd components assuming that I can get an LTC22632! I may 
>>> design a small PCB to super-impose the Teensy 4.1 over the existing 
>>> footprint and layout. In doing so, I could add the dual DAC on this new 
>>> adapter board. I can see CS is connected to pin10 but where are CLK and SDI 
>>> of the LTC2632 connected? I don’t see them in the code. Yes, It would be 
>>> great if you could post diagram for SCTV-E for Teensy 4.1 please.
>>>
>>> Interesting that you are redesigning the transformer. I managed to 
>>> hand-wire mine and seems to work well. The 6.3V for the heater is the one 
>>> that I’m not too sure how to calibrate exactly, since the SMPS… It shines a 
>>> bit too bright at the moment and voltage drops to 2V, so that’s not healthy 
>>> for the heater filament. I can remove a few turns but not sure what is the 
>>> ‘exact’ RMS V I’m looking for given the spikes of the SMPS at 100Khz, I’ll 
>>> continue to experiment on that using a 6.2V 500mA lightbulb to avoid 
>>> damaging the CRT.
>>>
>>> Thanks again for updating the schematic when you get a chance, it’ll 
>>> save me so much time to experiment.
>>>
>>>
>>>
>>> On 10 Jun 2023, at 16:41, David Forbes  wrote:
>>>
>>> Hi. The SCTV with the Teensy 4.0 uses an LTC2632 dual DAC. This uses SPI 
>>> to load the X and Y values. It's about half the update rate of the built-in 
>>> DACs in the previous Teensy 3.6, so I had to change the step size in the 
>>> drawing routines.
>>> Unfortunately this chip is tiny, so it's hard to solder. 
>>> I am in the process of redesigning the transformer and circuit board to 
>>> be more friendly for kit and DIY use. I want to make the PC board with 
>>> through hole parts, since people enjoy soldering those together.
>>> I will see if I can post the latest SCTV schematic diagram to my website 
>>> today. I've been traveling a lot lately. 
>>>
>>>
>>> On Sat, Jun 10, 2023, 6:33 AM Max DN  wrote:
>>>
>>>> True, but the schematic is SCTV rev. C which is for Teensy 3.6. Does 
>>>> anyone have the schematic for using Teensy 4.1? Just designed a clock 
>>>> based 
>>>> on SCTV-rev and

Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

Hey, Adrian, let me knew if you find that Teensy 3.6.I'm not having much luck 
with a teensy 4.1 + external DAC using SPI. Nor I can see any issues at all in 
the code. The connections are simple enough but it cannot draw a circle (as a 
test) on my CRT using the open source code that Cathode Corner published. 
Indeed, when I test the DAC output on the oscilloscope looks irregular, whereas 
the SPI lines seems to behave as expected. Odd. If I input two sine waves into 
the deflection amplifiers using my signal generator, then I can get a circle on 
the CRT, that proves that power supply, level shifters and deflection 
amplifiers should be fine. 
 Original message From: Adrian Godwin  
Date: 10/06/2023  17:17  (GMT+00:00) To: neonixie-l@googlegroups.com Subject: 
Re: [neonixie-l] ScopeClock with teensy4.0 I think I have an unused teensy 3.6. 
It may take some time to track it down but I'd happily swap it for a 4.1 if 
that simplifies things for you.On Sat, Jun 10, 2023 at 5:03 PM David Forbes 
 wrote:Here is the schematic of the SCTV rev E, which 
uses the Teensy 4.1. On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi 
 wrote:Thanks for your prompt reply David.I have already 
printed my board for a Teensy 3.6. I have no issues soldering tiny smd 
components assuming that I can get an LTC22632! I may design a small PCB to 
super-impose the Teensy 4.1 over the existing footprint and layout. In doing 
so, I could add the dual DAC on this new adapter board. I can see CS is 
connected to pin10 but where are CLK and SDI of the LTC2632 connected? I don’t 
see them in the code. Yes, It would be great if you could post diagram for 
SCTV-E for Teensy 4.1 please.Interesting that you are redesigning the 
transformer. I managed to hand-wire mine and seems to work well. The 6.3V for 
the heater is the one that I’m not too sure how to calibrate exactly, since the 
SMPS… It shines a bit too bright at the moment and voltage drops to 2V, so 
that’s not healthy for the heater filament. I can remove a few turns but not 
sure what is the ‘exact’ RMS V I’m looking for given the spikes of the SMPS at 
100Khz, I’ll continue to experiment on that using a 6.2V 500mA lightbulb to 
avoid damaging the CRT.Thanks again for updating the schematic when you get a 
chance, it’ll save me so much time to experiment.On 10 Jun 2023, at 16:41, 
David Forbes  wrote:Hi. The SCTV with the Teensy 4.0 uses 
an LTC2632 dual DAC. This uses SPI to load the X and Y values. It's about half 
the update rate of the built-in DACs in the previous Teensy 3.6, so I had to 
change the step size in the drawing routines.Unfortunately this chip is tiny, 
so it's hard to solder. I am in the process of redesigning the transformer and 
circuit board to be more friendly for kit and DIY use. I want to make the PC 
board with through hole parts, since people enjoy soldering those together.I 
will see if I can post the latest SCTV schematic diagram to my website today. 
I've been traveling a lot lately. On Sat, Jun 10, 2023, 6:33 AM Max DN 
 wrote:True, but the schematic is SCTV rev. C which is 
for Teensy 3.6. Does anyone have the schematic for using Teensy 4.1? Just 
designed a clock based on SCTV-rev and custom transformer but of course I have 
now realised that Teensy 3.6 is impossible to get...Il giorno sabato 11 marzo 
2023 alle 18:41:05 UTC SD ha scritto:David Forbes has the schematic on his 
website, and the firmware on Github.  I did not see that Jörg was making kits, 
in fact he said he didn't want to make kits, but perhaps make a PCB available, 
so I do not know why people are asking for kits.  On Friday, March 10, 2023 at 
3:42:49 PM UTC-5 liam bartosiewicz wrote:The schematic and software would be 
good enough for me, personally On Mar 10, 2023, at 10:15 AM, Darrin Weiss 
 wrote:I also have some interest in a kit On Friday, March 
10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:Yep... put me down too for a 
Scope Clock kit of parts :-)  Making the H/W & S/W open source would be cool 
too!I think selling PCB's & parts in kit form without enclosure, places FCC 
requirements on the user to not cause RF interference.  Isn't that how SparkFun 
and Adafruit can sell assembled PCBs without FCC certification?On Thursday, 
March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:Do you plan on publishing 
the software (on GitHub for example)?On Mar 8, 2023, at 5:36 PM, jörg 
 wrote:The tube is a RFT B7 S4-01It‘s from an EO174A 
Oscilloscope.Nice green and pretty good to focus and linearity to the edges.The 
tube and first version of PCB could be viewed at 
https://m.youtube.com/watch?v=zTyXJE2faXwI do not plan a kit or selling like 
david forbes do. First of all, it is initially his design and software. Second, 
I do not have the will and time to go through all the regulations EU/Germany 
has for selling such electronics.I could share the PCB if I order the next  
batch, but it is not finished, yet.I plan to ad

Re: [neonixie-l] ScopeClock with teensy4.0

[jörg]

gt;>>>
>>>>>>> Yep... put me down too for a Scope Clock kit of parts :-)  Making 
>>>>>>> the H/W & S/W open source would be cool too!
>>>>>>>
>>>>>>> I think selling PCB's & parts in kit form without enclosure, places 
>>>>>>> FCC requirements on the user to not cause RF interference.  
>>>>>>>
>>>>>>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without 
>>>>>>> FCC certification?
>>>>>>>
>>>>>>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>>>>>>>
>>>>>>>> Do you plan on publishing the software (on GitHub for example)?
>>>>>>>>
>>>>>>>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>>>>>>>
>>>>>>>> 
>>>>>>>>
>>>>>>>> The tube is a RFT B7 S4-01
>>>>>>>> It‘s from an EO174A Oscilloscope.
>>>>>>>> Nice green and pretty good to focus and linearity to the edges.
>>>>>>>> The tube and first version of PCB could be viewed at 
>>>>>>>> https://m.youtube.com/watch?v=zTyXJE2faXw 
>>>>>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>>>>>>
>>>>>>>> I do not plan a kit or selling like david forbes do. 
>>>>>>>> First of all, it is initially his design and software. Second, I do 
>>>>>>>> not have the will and time to go through all the regulations 
>>>>>>>> EU/Germany has 
>>>>>>>> for selling such electronics.
>>>>>>>> I could share the PCB if I order the next  batch, but it is not 
>>>>>>>> finished, yet.
>>>>>>>> I plan to add ESP32 for NTP and web config.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>>>>>>
>>>>>>>>> Definitely not off-topic! I think everyone on this forum 
>>>>>>>>> appreciates that post, well done. I really like the starfield effect. 
>>>>>>>>> What 
>>>>>>>>> tube were you using? Looks like it has very good linearity across the 
>>>>>>>>> whole 
>>>>>>>>> screen
>>>>>>>>>
>>>>>>>>> Cheers,
>>>>>>>>>
>>>>>>>>> Nick
>>>>>>>>>
>>>>>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>>>>>>
>>>>>>>>>> Hi !
>>>>>>>>>> Really interesting and great work. Looks really good and its a 
>>>>>>>>>> „want to have“.
>>>>>>>>>> Would be interested in pcb and code too , if possible a kit too.
>>>>>>>>>> Thank you.
>>>>>>>>>>
>>>>>>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>>>>>>>
>>>>>>>>>>> I am very interested as well.
>>>>>>>>>>>
>>>>>>>>>>>  
>>>>>>>>>>>
>>>>>>>>>>> Would love to have the code and pcb design and even a kit.
>>>>>>>>>>>
>>>>>>>>>>>  
>>>>>>>>>>>
>>>>>>>>>>> I read through the posts, but didn’t see anything other than the 
>>>>>>>>>>> video.   Thumbs up on it too.   😊
>>>>>>>>>>>
>>>>>>>>>>>  
>>>>>>>>>>>
>>>>>>>>>>> Michail Wilson
>>>>>>>>>>>
>>>>>&g

Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

gt;>>> The tube and first version of PCB could be viewed at 
>>>> https://m.youtube.com/watch?v=zTyXJE2faXw 
>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>> 
>>>> I do not plan a kit or selling like david forbes do. 
>>>> First of all, it is initially his design and software. Second, I do not 
>>>> have the will and time to go through all the regulations EU/Germany has 
>>>> for selling such electronics.
>>>> I could share the PCB if I order the next  batch, but it is not finished, 
>>>> yet.
>>>> I plan to add ESP32 for NTP and web config.
>>>> 
>>>> 
>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>> Definitely not off-topic! I think everyone on this forum appreciates that 
>>>> post, well done. I really like the starfield effect. What tube were you 
>>>> using? Looks like it has very good linearity across the whole screen
>>>> 
>>>> Cheers,
>>>> 
>>>> Nick
>>>> 
>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu > wrote:
>>>> Hi !
>>>> Really interesting and great work. Looks really good and its a „want to 
>>>> have“.
>>>> Would be interested in pcb and code too , if possible a kit too.
>>>> Thank you.
>>>> 
>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>> I am very interested as well.
>>>> 
>>>>  
>>>> 
>>>> Would love to have the code and pcb design and even a kit.
>>>> 
>>>>  
>>>> 
>>>> I read through the posts, but didn’t see anything other than the video.   
>>>> Thumbs up on it too.   😊
>>>> 
>>>>  
>>>> 
>>>> Michail Wilson
>>>> 
>>>> 206-920-6312 
>>>>  
>>>> 
>>>> From: neoni...@googlegroups.com <> > On 
>>>> Behalf Of jörg
>>>> Sent: Saturday, March 4, 2023 7:14 AM
>>>> To: neonixie-l >
>>>> Subject: Re: [neonixie-l] ScopeClock with teensy4.0
>>>> 
>>>>  
>>>> 
>>>> @Jon,
>>>> 
>>>> 
>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>>> hardware, too.
>>>> Do yo you have build the hardware already?
>>>> 
>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>> 
>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
>>>> latest version. I had to reduce the DAC rate by half. It looks just as 
>>>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>>> 
>>>>  
>>>> 
>>>>  
>>>> 
>>>>  
>>>> 
>>>> On Thu, Mar 2, 2023, 7:17 AM jörg > wrote:
>>>> 
>>>> Hi, maybe a bit offtopic.
>>>> 
>>>> I've put some effort in using the teensy4.x to run the scope clock based 
>>>> on david forbes one.
>>>> The teensy3.6 based one is running on my own hardware for a while.
>>>> 
>>>> But because of CPU shortage and the use of the teensy3.6 internal DAC's, I 
>>>> was curious to get the stuff up and running on the faster teensy 4.x CPU.
>>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>>>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>>>> teensy4.x.
>>>> Anyway, this works and I like it.
>>>> 
>>>> Video: https://youtu.be/HYwgyYnQUxw <https://youtu.be/HYwgyYnQUxw>
>>>> 
>>>> 
>>>> -- 
>>>> You received this message because you are subscribed to the Google Groups 
>>>> "neonixie-l" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send an 
>>>> email to neonixie-l+...@googlegroups.com <>.
>&

Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

4%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>> 
>>>> I do not plan a kit or selling like david forbes do. 
>>>> First of all, it is initially his design and software. Second, I do not 
>>>> have the will and time to go through all the regulations EU/Germany has 
>>>> for selling such electronics.
>>>> I could share the PCB if I order the next  batch, but it is not finished, 
>>>> yet.
>>>> I plan to add ESP32 for NTP and web config.
>>>> 
>>>> 
>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>> Definitely not off-topic! I think everyone on this forum appreciates that 
>>>> post, well done. I really like the starfield effect. What tube were you 
>>>> using? Looks like it has very good linearity across the whole screen
>>>> 
>>>> Cheers,
>>>> 
>>>> Nick
>>>> 
>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu > wrote:
>>>> Hi !
>>>> Really interesting and great work. Looks really good and its a „want to 
>>>> have“.
>>>> Would be interested in pcb and code too , if possible a kit too.
>>>> Thank you.
>>>> 
>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>> I am very interested as well.
>>>> 
>>>>  
>>>> 
>>>> Would love to have the code and pcb design and even a kit.
>>>> 
>>>>  
>>>> 
>>>> I read through the posts, but didn’t see anything other than the video.   
>>>> Thumbs up on it too.   😊
>>>> 
>>>>  
>>>> 
>>>> Michail Wilson
>>>> 
>>>> 206-920-6312 
>>>>  
>>>> 
>>>> From: neoni...@googlegroups.com <> > On 
>>>> Behalf Of jörg
>>>> Sent: Saturday, March 4, 2023 7:14 AM
>>>> To: neonixie-l >
>>>> Subject: Re: [neonixie-l] ScopeClock with teensy4.0
>>>> 
>>>>  
>>>> 
>>>> @Jon,
>>>> 
>>>> 
>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>>> hardware, too.
>>>> Do yo you have build the hardware already?
>>>> 
>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>> 
>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
>>>> latest version. I had to reduce the DAC rate by half. It looks just as 
>>>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>>> 
>>>>  
>>>> 
>>>>  
>>>> 
>>>>  
>>>> 
>>>> On Thu, Mar 2, 2023, 7:17 AM jörg > wrote:
>>>> 
>>>> Hi, maybe a bit offtopic.
>>>> 
>>>> I've put some effort in using the teensy4.x to run the scope clock based 
>>>> on david forbes one.
>>>> The teensy3.6 based one is running on my own hardware for a while.
>>>> 
>>>> But because of CPU shortage and the use of the teensy3.6 internal DAC's, I 
>>>> was curious to get the stuff up and running on the faster teensy 4.x CPU.
>>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>>>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>>>> teensy4.x.
>>>> Anyway, this works and I like it.
>>>> 
>>>> Video: https://youtu.be/HYwgyYnQUxw <https://youtu.be/HYwgyYnQUxw>
>>>> 
>>>> 
>>>> -- 
>>>> You received this message because you are subscribed to the Google Groups 
>>>> "neonixie-l" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send an 
>>>> email to neonixie-l+...@googlegroups.com <>.
>>>> To view this discussion on the web, visit 
>>>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>>>>  
>>>> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer>.
>>>> 
>>>&g

Re: [neonixie-l] ScopeClock with teensy4.0

[Adrian Godwin]

t;> Nice green and pretty good to focus and linearity to the edges.
>>>>>>> The tube and first version of PCB could be viewed at
>>>>>>> https://m.youtube.com/watch?v=zTyXJE2faXw
>>>>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>>>>>
>>>>>>> I do not plan a kit or selling like david forbes do.
>>>>>>> First of all, it is initially his design and software. Second, I do
>>>>>>> not have the will and time to go through all the regulations EU/Germany 
>>>>>>> has
>>>>>>> for selling such electronics.
>>>>>>> I could share the PCB if I order the next  batch, but it is not
>>>>>>> finished, yet.
>>>>>>> I plan to add ESP32 for NTP and web config.
>>>>>>>
>>>>>>>
>>>>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>>>>>
>>>>>>>> Definitely not off-topic! I think everyone on this forum
>>>>>>>> appreciates that post, well done. I really like the starfield effect. 
>>>>>>>> What
>>>>>>>> tube were you using? Looks like it has very good linearity across the 
>>>>>>>> whole
>>>>>>>> screen
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>> Nick
>>>>>>>>
>>>>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>>>>>
>>>>>>>>> Hi !
>>>>>>>>> Really interesting and great work. Looks really good and its a
>>>>>>>>> „want to have“.
>>>>>>>>> Would be interested in pcb and code too , if possible a kit too.
>>>>>>>>> Thank you.
>>>>>>>>>
>>>>>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>>>>>>
>>>>>>>>>> I am very interested as well.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Would love to have the code and pcb design and even a kit.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I read through the posts, but didn’t see anything other than the
>>>>>>>>>> video.   Thumbs up on it too.   😊
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Michail Wilson
>>>>>>>>>>
>>>>>>>>>> 206-920-6312 <(206)%20920-6312>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> *From:* neoni...@googlegroups.com  *On
>>>>>>>>>> Behalf Of *jörg
>>>>>>>>>> *Sent:* Saturday, March 4, 2023 7:14 AM
>>>>>>>>>> *To:* neonixie-l 
>>>>>>>>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> @Jon,
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> yes, I will share the code. I have moved it to the VS Code IDE
>>>>>>>>>> with PlatformIO. I do not like the Arduino IDE much. It should run on
>>>>>>>>>> david's hardware, too.
>>>>>>>>>> Do yo you have build the hardware already?
>>>>>>>>>>
>>>>>>>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>>>>>>>>
>>>>>>>>>>

Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>> Definitely not off-topic! I think everyone on this forum appreciates that 
>>> post, well done. I really like the starfield effect. What tube were you 
>>> using? Looks like it has very good linearity across the whole screen
>>> 
>>> Cheers,
>>> 
>>> Nick
>>> 
>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu > wrote:
>>> Hi !
>>> Really interesting and great work. Looks really good and its a „want to 
>>> have“.
>>> Would be interested in pcb and code too , if possible a kit too.
>>> Thank you.
>>> 
>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>> I am very interested as well.
>>> 
>>>  
>>> 
>>> Would love to have the code and pcb design and even a kit.
>>> 
>>>  
>>> 
>>> I read through the posts, but didn’t see anything other than the video.   
>>> Thumbs up on it too.   😊
>>> 
>>>  
>>> 
>>> Michail Wilson
>>> 
>>> 206-920-6312 
>>>  
>>> 
>>> From: neoni...@googlegroups.com <> > On Behalf 
>>> Of jörg
>>> Sent: Saturday, March 4, 2023 7:14 AM
>>> To: neonixie-l >
>>> Subject: Re: [neonixie-l] ScopeClock with teensy4.0
>>> 
>>>  
>>> 
>>> @Jon,
>>> 
>>> 
>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>> hardware, too.
>>> Do yo you have build the hardware already?
>>> 
>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>> 
>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
>>> latest version. I had to reduce the DAC rate by half. It looks just as good 
>>> as the old version. Of course, the DAC I chise is already unobtanium.
>>> 
>>>  
>>> 
>>>  
>>> 
>>>  
>>> 
>>> On Thu, Mar 2, 2023, 7:17 AM jörg > wrote:
>>> 
>>> Hi, maybe a bit offtopic.
>>> 
>>> I've put some effort in using the teensy4.x to run the scope clock based on 
>>> david forbes one.
>>> The teensy3.6 based one is running on my own hardware for a while.
>>> 
>>> But because of CPU shortage and the use of the teensy3.6 internal DAC's, I 
>>> was curious to get the stuff up and running on the faster teensy 4.x CPU.
>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>>> teensy4.x.
>>> Anyway, this works and I like it.
>>> 
>>> Video: https://youtu.be/HYwgyYnQUxw <https://youtu.be/HYwgyYnQUxw>
>>> 
>>> 
>>> -- 
>>> You received this message because you are subscribed to the Google Groups 
>>> "neonixie-l" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an 
>>> email to neonixie-l+...@googlegroups.com <>.
>>> To view this discussion on the web, visit 
>>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>>>  
>>> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer>.
>>> 
>>> -- 
>>> You received this message because you are subscribed to the Google Groups 
>>> "neonixie-l" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an 
>>> email to neonixie-l+...@googlegroups.com <>.
>>> 
>>> To view this discussion on the web, visit 
>>> https://groups.google.com/d/msgid/neonixie-l/bc1f2bea-aa6f-4890-bcc9-4b3104b444c7n%40googlegroups.com
>>>  
>>> <https://groups.google.com/d/msgid/neonixie-l/bc1f2bea-aa6f-4890-bcc9-4b3104b444c7n%40googlegroups.com?utm_medium=email&utm_source=footer>.
>>> 
>>> 
>>> -- 
>>> You received this message because you are subscribed to the Google Groups 
>>> "neonixie-l" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an 
>>> email to neonixie-l+...@googlegroups.com <>.
>>> To view this discussion on the web, visit 
>>> https://groups.google.com/d/msgid/neonixie-l/48106ee0-dc58-429b-a701

Re: [neonixie-l] ScopeClock with teensy4.0

[David Forbes]

Hi. The SCTV with the Teensy 4.0 uses an LTC2632 dual DAC. This uses SPI to
load the X and Y values. It's about half the update rate of the built-in
DACs in the previous Teensy 3.6, so I had to change the step size in the
drawing routines.
Unfortunately this chip is tiny, so it's hard to solder.
I am in the process of redesigning the transformer and circuit board to be
more friendly for kit and DIY use. I want to make the PC board with through
hole parts, since people enjoy soldering those together.
I will see if I can post the latest SCTV schematic diagram to my website
today. I've been traveling a lot lately.


On Sat, Jun 10, 2023, 6:33 AM Max DN  wrote:

> True, but the schematic is SCTV rev. C which is for Teensy 3.6. Does
> anyone have the schematic for using Teensy 4.1? Just designed a clock based
> on SCTV-rev and custom transformer but of course I have now realised that
> Teensy 3.6 is impossible to get...
>
> Il giorno sabato 11 marzo 2023 alle 18:41:05 UTC SD ha scritto:
>
>> David Forbes has the schematic on his website, and the firmware on
>> Github.  I did not see that Jörg was making kits, in fact he said he didn't
>> want to make kits, but perhaps make a PCB available, so I do not know why
>> people are asking for kits.
>>
>> On Friday, March 10, 2023 at 3:42:49 PM UTC-5 liam bartosiewicz wrote:
>>
>>> The schematic and software would be good enough for me, personally
>>>
>>> On Mar 10, 2023, at 10:15 AM, Darrin Weiss  wrote:
>>>
>>> I also have some interest in a kit
>>>
>>>
>>>
>>> On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:
>>>
>>>> Yep... put me down too for a Scope Clock kit of parts :-)  Making the
>>>> H/W & S/W open source would be cool too!
>>>>
>>>> I think selling PCB's & parts in kit form without enclosure, places FCC
>>>> requirements on the user to not cause RF interference.
>>>>
>>>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without
>>>> FCC certification?
>>>>
>>>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>>>>
>>>>> Do you plan on publishing the software (on GitHub for example)?
>>>>>
>>>>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>>>>
>>>>> 
>>>>>
>>>>> The tube is a RFT B7 S4-01
>>>>>
>>>>> It‘s from an EO174A Oscilloscope.
>>>>>
>>>>> Nice green and pretty good to focus and linearity to the edges.
>>>>>
>>>>> The tube and first version of PCB could be viewed at
>>>>> https://m.youtube.com/watch?v=zTyXJE2faXw
>>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>>>
>>>>>
>>>>> I do not plan a kit or selling like david forbes do.
>>>>> First of all, it is initially his design and software. Second, I do
>>>>> not have the will and time to go through all the regulations EU/Germany 
>>>>> has
>>>>> for selling such electronics.
>>>>>
>>>>> I could share the PCB if I order the next  batch, but it is not
>>>>> finished, yet.
>>>>>
>>>>> I plan to add ESP32 for NTP and web config.
>>>>>
>>>>>
>>>>>
>>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>>>
>>>>>> Definitely not off-topic! I think everyone on this forum appreciates
>>>>>> that post, well done. I really like the starfield effect. What tube were
>>>>>> you using? Looks like it has very good linearity across the whole 
>>>>>> screen
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Nick
>>>>>>
>>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>>>
>>>>>>> Hi !
>>>>>>> Really interesting and great work. Looks really good and its a „want
>>>>>>> to have“.
>>>>>>> Would be interes

Re: [neonixie-l] ScopeClock with teensy4.0

[Max DN]

True, but the schematic is SCTV rev. C which is for Teensy 3.6. Does anyone 
have the schematic for using Teensy 4.1? Just designed a clock based on 
SCTV-rev and custom transformer but of course I have now realised that 
Teensy 3.6 is impossible to get...

Il giorno sabato 11 marzo 2023 alle 18:41:05 UTC SD ha scritto:

> David Forbes has the schematic on his website, and the firmware on 
> Github.  I did not see that Jörg was making kits, in fact he said he didn't 
> want to make kits, but perhaps make a PCB available, so I do not know why 
> people are asking for kits.  
>
> On Friday, March 10, 2023 at 3:42:49 PM UTC-5 liam bartosiewicz wrote:
>
>> The schematic and software would be good enough for me, personally 
>>
>> On Mar 10, 2023, at 10:15 AM, Darrin Weiss  wrote:
>>
>> I also have some interest in a kit 
>>
>>
>>
>> On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:
>>
>>> Yep... put me down too for a Scope Clock kit of parts :-)  Making the 
>>> H/W & S/W open source would be cool too!
>>>
>>> I think selling PCB's & parts in kit form without enclosure, places FCC 
>>> requirements on the user to not cause RF interference.  
>>>
>>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without FCC 
>>> certification?
>>>
>>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>>>
>>>> Do you plan on publishing the software (on GitHub for example)?
>>>>
>>>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>>>
>>>> 
>>>>
>>>> The tube is a RFT B7 S4-01
>>>>
>>>> It‘s from an EO174A Oscilloscope.
>>>>
>>>> Nice green and pretty good to focus and linearity to the edges.
>>>>
>>>> The tube and first version of PCB could be viewed at 
>>>> https://m.youtube.com/watch?v=zTyXJE2faXw 
>>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>>
>>>>
>>>> I do not plan a kit or selling like david forbes do. 
>>>> First of all, it is initially his design and software. Second, I do not 
>>>> have the will and time to go through all the regulations EU/Germany has 
>>>> for 
>>>> selling such electronics.
>>>>
>>>> I could share the PCB if I order the next  batch, but it is not 
>>>> finished, yet.
>>>>
>>>> I plan to add ESP32 for NTP and web config.
>>>>
>>>>
>>>>
>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>>
>>>>> Definitely not off-topic! I think everyone on this forum appreciates 
>>>>> that post, well done. I really like the starfield effect. What tube were 
>>>>> you using? Looks like it has very good linearity across the whole 
>>>>> screen
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Nick
>>>>>
>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>>
>>>>>> Hi !
>>>>>> Really interesting and great work. Looks really good and its a „want 
>>>>>> to have“.
>>>>>> Would be interested in pcb and code too , if possible a kit too.
>>>>>> Thank you.
>>>>>>
>>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>>>
>>>>>>> I am very interested as well.
>>>>>>>
>>>>>>>  
>>>>>>>
>>>>>>> Would love to have the code and pcb design and even a kit.
>>>>>>>
>>>>>>>  
>>>>>>>
>>>>>>> I read through the posts, but didn’t see anything other than the 
>>>>>>> video.   Thumbs up on it too.   😊
>>>>>>>
>>>>>>>  
>>>>>>>
>>>>>>> Michail Wilson
>>>>>>>
>>>>>>> 206-920-6312 <(206)%20920-6312>
>>>>>>>
>>>>>&

Re: [neonixie-l] ScopeClock with teensy4.0

[SD]

David Forbes has the schematic on his website, and the firmware on Github.  
I did not see that Jörg was making kits, in fact he said he didn't want to 
make kits, but perhaps make a PCB available, so I do not know why people 
are asking for kits.  

On Friday, March 10, 2023 at 3:42:49 PM UTC-5 liam bartosiewicz wrote:

> The schematic and software would be good enough for me, personally 
>
> On Mar 10, 2023, at 10:15 AM, Darrin Weiss  wrote:
>
> I also have some interest in a kit 
>
>
>
> On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:
>
>> Yep... put me down too for a Scope Clock kit of parts :-)  Making the H/W 
>> & S/W open source would be cool too!
>>
>> I think selling PCB's & parts in kit form without enclosure, places FCC 
>> requirements on the user to not cause RF interference.  
>>
>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without FCC 
>> certification?
>>
>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>>
>>> Do you plan on publishing the software (on GitHub for example)?
>>>
>>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>>
>>> 
>>>
>>> The tube is a RFT B7 S4-01
>>>
>>> It‘s from an EO174A Oscilloscope.
>>>
>>> Nice green and pretty good to focus and linearity to the edges.
>>>
>>> The tube and first version of PCB could be viewed at 
>>> https://m.youtube.com/watch?v=zTyXJE2faXw 
>>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>>
>>>
>>> I do not plan a kit or selling like david forbes do. 
>>> First of all, it is initially his design and software. Second, I do not 
>>> have the will and time to go through all the regulations EU/Germany has for 
>>> selling such electronics.
>>>
>>> I could share the PCB if I order the next  batch, but it is not 
>>> finished, yet.
>>>
>>> I plan to add ESP32 for NTP and web config.
>>>
>>>
>>>
>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>
>>>> Definitely not off-topic! I think everyone on this forum appreciates 
>>>> that post, well done. I really like the starfield effect. What tube were 
>>>> you using? Looks like it has very good linearity across the whole 
>>>> screen
>>>>
>>>> Cheers,
>>>>
>>>> Nick
>>>>
>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>
>>>>> Hi !
>>>>> Really interesting and great work. Looks really good and its a „want 
>>>>> to have“.
>>>>> Would be interested in pcb and code too , if possible a kit too.
>>>>> Thank you.
>>>>>
>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>>
>>>>>> I am very interested as well.
>>>>>>
>>>>>>  
>>>>>>
>>>>>> Would love to have the code and pcb design and even a kit.
>>>>>>
>>>>>>  
>>>>>>
>>>>>> I read through the posts, but didn’t see anything other than the 
>>>>>> video.   Thumbs up on it too.   😊
>>>>>>
>>>>>>  
>>>>>>
>>>>>> Michail Wilson
>>>>>>
>>>>>> 206-920-6312 <(206)%20920-6312>
>>>>>>
>>>>>>  
>>>>>>
>>>>>> *From:* neoni...@googlegroups.com  *On 
>>>>>> Behalf Of *jörg
>>>>>> *Sent:* Saturday, March 4, 2023 7:14 AM
>>>>>> *To:* neonixie-l 
>>>>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>>>>>
>>>>>>  
>>>>>>
>>>>>> @Jon,
>>>>>>
>>>>>>
>>>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>>>>> hardware, too.
>>

Re: [neonixie-l] ScopeClock with teensy4.0

[liam bartosiewicz]

The schematic and software would be good enough for me, personally 

> On Mar 10, 2023, at 10:15 AM, Darrin Weiss  wrote:
> 
> I also have some interest in a kit 
> 
>> On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:
>> Yep... put me down too for a Scope Clock kit of parts :-)  Making the H/W & 
>> S/W open source would be cool too!
>> 
>> I think selling PCB's & parts in kit form without enclosure, places FCC 
>> requirements on the user to not cause RF interference.  
>> 
>> Isn't that how SparkFun and Adafruit can sell assembled PCBs without FCC 
>> certification?
>> 
>>> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>>> Do you plan on publishing the software (on GitHub for example)?
>>> 
>>>>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>>>> 
>>>> 
>>> 
>>>> The tube is a RFT B7 S4-01
>>>> It‘s from an EO174A Oscilloscope.
>>>> Nice green and pretty good to focus and linearity to the edges.
>>>> The tube and first version of PCB could be viewed at 
>>>> https://m.youtube.com/watch?v=zTyXJE2faXw
>>>> 
>>>> I do not plan a kit or selling like david forbes do. 
>>>> First of all, it is initially his design and software. Second, I do not 
>>>> have the will and time to go through all the regulations EU/Germany has 
>>>> for selling such electronics.
>>>> I could share the PCB if I order the next  batch, but it is not finished, 
>>>> yet.
>>>> I plan to add ESP32 for NTP and web config.
>>>> 
>>>> 
>>>>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>>>> Definitely not off-topic! I think everyone on this forum appreciates that 
>>>>> post, well done. I really like the starfield effect. What tube were you 
>>>>> using? Looks like it has very good linearity across the whole screen
>>>>> 
>>>>> Cheers,
>>>>> 
>>>>> Nick
>>>>> 
>>>>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>>>> Hi !
>>>>>> Really interesting and great work. Looks really good and its a „want to 
>>>>>> have“.
>>>>>> Would be interested in pcb and code too , if possible a kit too.
>>>>>> Thank you.
>>>>>> 
>>>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>>>> I am very interested as well.
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>> Would love to have the code and pcb design and even a kit.
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>> I read through the posts, but didn’t see anything other than the video. 
>>>>>>>   Thumbs up on it too.   😊
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>> Michail Wilson
>>>>>>> 
>>>>>>> 206-920-6312
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>> From: neoni...@googlegroups.com  On Behalf 
>>>>>>> Of jörg
>>>>>>> Sent: Saturday, March 4, 2023 7:14 AM
>>>>>>> To: neonixie-l 
>>>>>>> Subject: Re: [neonixie-l] ScopeClock with teensy4.0
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>> @Jon,
>>>>>>> 
>>>>>>> 
>>>>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>>>>> PlatformIO. I do not like the Arduino IDE much. It should run on 
>>>>>>> david's hardware, too.
>>>>>>> Do yo you have build the hardware already?
>>>>>>> 
>>>>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>>>>> 
>>>>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in 
>>>>>>> my latest version. I had to reduce the DAC rate by half. It looks just 
>>>>>>> as good as the old version. Of course, the DAC I chise is already 
>>>>>>> unobtanium.
>>>>>>> 
>>>>>>>  
>>>>>>> 
>>>>>>>  
>>

Re: [neonixie-l] ScopeClock with teensy4.0

[Darrin Weiss]

I also have some interest in a kit 

On Friday, March 10, 2023 at 10:00:11 AM UTC-5 Richard Arndt wrote:

> Yep... put me down too for a Scope Clock kit of parts :-)  Making the H/W 
> & S/W open source would be cool too!
>
> I think selling PCB's & parts in kit form without enclosure, places FCC 
> requirements on the user to not cause RF interference.  
>
> Isn't that how SparkFun and Adafruit can sell assembled PCBs without FCC 
> certification?
>
> On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:
>
>> Do you plan on publishing the software (on GitHub for example)?
>>
>> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>>
>> 
>>
>> The tube is a RFT B7 S4-01
>>
>> It‘s from an EO174A Oscilloscope.
>>
>> Nice green and pretty good to focus and linearity to the edges.
>>
>> The tube and first version of PCB could be viewed at 
>> https://m.youtube.com/watch?v=zTyXJE2faXw 
>> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>>
>>
>> I do not plan a kit or selling like david forbes do. 
>> First of all, it is initially his design and software. Second, I do not 
>> have the will and time to go through all the regulations EU/Germany has for 
>> selling such electronics.
>>
>> I could share the PCB if I order the next  batch, but it is not 
>> finished, yet.
>>
>> I plan to add ESP32 for NTP and web config.
>>
>>
>>
>> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>>
>>> Definitely not off-topic! I think everyone on this forum appreciates 
>>> that post, well done. I really like the starfield effect. What tube were 
>>> you using? Looks like it has very good linearity across the whole screen
>>>
>>> Cheers,
>>>
>>> Nick
>>>
>>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>>
>>>> Hi !
>>>> Really interesting and great work. Looks really good and its a „want to 
>>>> have“.
>>>> Would be interested in pcb and code too , if possible a kit too.
>>>> Thank you.
>>>>
>>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>>
>>>>> I am very interested as well.
>>>>>
>>>>>  
>>>>>
>>>>> Would love to have the code and pcb design and even a kit.
>>>>>
>>>>>  
>>>>>
>>>>> I read through the posts, but didn’t see anything other than the 
>>>>> video.   Thumbs up on it too.   😊
>>>>>
>>>>>  
>>>>>
>>>>> Michail Wilson
>>>>>
>>>>> 206-920-6312 <(206)%20920-6312>
>>>>>
>>>>>  
>>>>>
>>>>> *From:* neoni...@googlegroups.com  *On 
>>>>> Behalf Of *jörg
>>>>> *Sent:* Saturday, March 4, 2023 7:14 AM
>>>>> *To:* neonixie-l 
>>>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>>>>
>>>>>  
>>>>>
>>>>> @Jon,
>>>>>
>>>>>
>>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>>>> hardware, too.
>>>>> Do yo you have build the hardware already?
>>>>>
>>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>>>
>>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC 
>>>>> in my latest version. I had to reduce the DAC rate by half. It looks just 
>>>>> as good as the old version. Of course, the DAC I chise is already 
>>>>> unobtanium.
>>>>>
>>>>>  
>>>>>
>>>>>  
>>>>>
>>>>>  
>>>>>
>>>>> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>>>>>
>>>>> Hi, maybe a bit offtopic.
>>>>>
>>>>> I've put some effort in using the teensy4.x to run the scope

Re: [neonixie-l] ScopeClock with teensy4.0

[Richard Arndt]

Yep... put me down too for a Scope Clock kit of parts :-)  Making the H/W & 
S/W open source would be cool too!

I think selling PCB's & parts in kit form without enclosure, places FCC 
requirements on the user to not cause RF interference.  

Isn't that how SparkFun and Adafruit can sell assembled PCBs without FCC 
certification?

On Thursday, March 9, 2023 at 9:19:56 AM UTC-5 Paul Andrews wrote:

> Do you plan on publishing the software (on GitHub for example)?
>
> On Mar 8, 2023, at 5:36 PM, jörg  wrote:
>
> 
>
> The tube is a RFT B7 S4-01
>
> It‘s from an EO174A Oscilloscope.
>
> Nice green and pretty good to focus and linearity to the edges.
>
> The tube and first version of PCB could be viewed at 
> https://m.youtube.com/watch?v=zTyXJE2faXw 
> <https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
>
>
> I do not plan a kit or selling like david forbes do. 
> First of all, it is initially his design and software. Second, I do not 
> have the will and time to go through all the regulations EU/Germany has for 
> selling such electronics.
>
> I could share the PCB if I order the next  batch, but it is not finished, 
> yet.
>
> I plan to add ESP32 for NTP and web config.
>
>
>
> On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:
>
>> Definitely not off-topic! I think everyone on this forum appreciates that 
>> post, well done. I really like the starfield effect. What tube were you 
>> using? Looks like it has very good linearity across the whole screen
>>
>> Cheers,
>>
>> Nick
>>
>> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>>
>>> Hi !
>>> Really interesting and great work. Looks really good and its a „want to 
>>> have“.
>>> Would be interested in pcb and code too , if possible a kit too.
>>> Thank you.
>>>
>>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>>
>>>> I am very interested as well.
>>>>
>>>>  
>>>>
>>>> Would love to have the code and pcb design and even a kit.
>>>>
>>>>  
>>>>
>>>> I read through the posts, but didn’t see anything other than the 
>>>> video.   Thumbs up on it too.   😊
>>>>
>>>>  
>>>>
>>>> Michail Wilson
>>>>
>>>> 206-920-6312 <(206)%20920-6312>
>>>>
>>>>  
>>>>
>>>> *From:* neoni...@googlegroups.com  *On 
>>>> Behalf Of *jörg
>>>> *Sent:* Saturday, March 4, 2023 7:14 AM
>>>> *To:* neonixie-l 
>>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>>>
>>>>  
>>>>
>>>> @Jon,
>>>>
>>>>
>>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>>> hardware, too.
>>>> Do yo you have build the hardware already?
>>>>
>>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>>
>>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in 
>>>> my latest version. I had to reduce the DAC rate by half. It looks just as 
>>>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>>>
>>>>  
>>>>
>>>>  
>>>>
>>>>  
>>>>
>>>> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>>>>
>>>> Hi, maybe a bit offtopic.
>>>>
>>>> I've put some effort in using the teensy4.x to run the scope clock 
>>>> based on david forbes one.
>>>> The teensy3.6 based one is running on my own hardware for a while.
>>>>
>>>> But because of CPU shortage and the use of the teensy3.6 internal 
>>>> DAC's, I was curious to get the stuff up and running on the faster teensy 
>>>> 4.x CPU.
>>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>>>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>>>> teensy4.x.
&g

Re: [neonixie-l] ScopeClock with teensy4.0

[Paul Andrews]

Do you plan on publishing the software (on GitHub for example)?On Mar 8, 2023, at 5:36 PM, jörg  wrote:The tube is a RFT B7 S4-01It‘s from an EO174A Oscilloscope.Nice green and pretty good to focus and linearity to the edges.The tube and first version of PCB could be viewed at https://m.youtube.com/watch?v=zTyXJE2faXwI do not plan a kit or selling like david forbes do. First of all, it is initially his design and software. Second, I do not have the will and time to go through all the regulations EU/Germany has for selling such electronics.I could share the PCB if I order the next  batch, but it is not finished, yet.I plan to add ESP32 for NTP and web config.On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:Definitely not off-topic! I think everyone on this forum appreciates that post, well done. I really like the starfield effect. What tube were you using? Looks like it has very good linearity across the whole screenCheers,NickOn Sat, Mar 4, 2023 at 11:55 PM Wo Tu <wtu...@gmail.com> wrote:Hi !Really interesting and great work. Looks really good and its a „want to have“.Would be interested in pcb and code too , if possible a kit too.Thank you.Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:







I am very interested as well.
 
Would love to have the code and pcb design and even a kit.
 
I read through the posts, but didn’t see anything other than the video.   Thumbs up on it too.  
😊
 
Michail Wilson
206-920-6312
 

From: neoni...@googlegroups.com <neoni...@googlegroups.com>
On Behalf Of jörg
Sent: Saturday, March 4, 2023 7:14 AM
To: neonixie-l <neoni...@googlegroups.com>
Subject: Re: [neonixie-l] ScopeClock with teensy4.0

 
@Jon,
yes, I will share the code. I have moved it to the VS Code IDE with PlatformIO. I do not like the Arduino IDE much. It should run on david's hardware, too.
Do yo you have build the hardware already?


On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:



I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my latest version. I had to reduce the DAC rate by half. It looks just as good as the old version. Of course, the DAC I chise is already unobtanium.

 

 



 


On Thu, Mar 2, 2023, 7:17 AM jörg <pos...@gmail.com> wrote:




Hi, maybe a bit offtopic.

I've put some effort in using the teensy4.x to run the scope clock based on david forbes one.
The teensy3.6 based one is running on my own hardware for a while.

But because of CPU shortage and the use of the teensy3.6 internal DAC's, I was curious to get the stuff up and running on the faster teensy 4.x CPU.
In this approach I'm using a parallel driven 12 bit 4 channels DAC. The usage of a serial DAC was too slow and I did not get DMA up and running on teensy4.x.
Anyway, this works and I like it.

Video: https://youtu.be/HYwgyYnQUxw







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Re: [neonixie-l] ScopeClock with teensy4.0

[jörg]

The tube is a RFT B7 S4-01

It‘s from an EO174A Oscilloscope.

Nice green and pretty good to focus and linearity to the edges.

The tube and first version of PCB could be viewed at 
https://m.youtube.com/watch?v=zTyXJE2faXw 
<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>


I do not plan a kit or selling like david forbes do. 
First of all, it is initially his design and software. Second, I do not 
have the will and time to go through all the regulations EU/Germany has for 
selling such electronics.

I could share the PCB if I order the next  batch, but it is not finished, 
yet.

I plan to add ESP32 for NTP and web config.



On Sunday, March 5, 2023 at 8:02:28 PM UTC+1 Nicholas Stock wrote:

> Definitely not off-topic! I think everyone on this forum appreciates that 
> post, well done. I really like the starfield effect. What tube were you 
> using? Looks like it has very good linearity across the whole screen
>
> Cheers,
>
> Nick
>
> On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:
>
>> Hi !
>> Really interesting and great work. Looks really good and its a „want to 
>> have“.
>> Would be interested in pcb and code too , if possible a kit too.
>> Thank you.
>>
>> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>>
>>> I am very interested as well.
>>>
>>>  
>>>
>>> Would love to have the code and pcb design and even a kit.
>>>
>>>  
>>>
>>> I read through the posts, but didn’t see anything other than the 
>>> video.   Thumbs up on it too.   😊
>>>
>>>  
>>>
>>> Michail Wilson
>>>
>>> 206-920-6312 <(206)%20920-6312>
>>>
>>>  
>>>
>>> *From:* neoni...@googlegroups.com  *On 
>>> Behalf Of *jörg
>>> *Sent:* Saturday, March 4, 2023 7:14 AM
>>> *To:* neonixie-l 
>>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>>
>>>  
>>>
>>> @Jon,
>>>
>>>
>>> yes, I will share the code. I have moved it to the VS Code IDE with 
>>> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
>>> hardware, too.
>>> Do yo you have build the hardware already?
>>>
>>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>>
>>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in 
>>> my latest version. I had to reduce the DAC rate by half. It looks just as 
>>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>>
>>>  
>>>
>>>  
>>>
>>>  
>>>
>>> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>>>
>>> Hi, maybe a bit offtopic.
>>>
>>> I've put some effort in using the teensy4.x to run the scope clock based 
>>> on david forbes one.
>>> The teensy3.6 based one is running on my own hardware for a while.
>>>
>>> But because of CPU shortage and the use of the teensy3.6 internal DAC's, 
>>> I was curious to get the stuff up and running on the faster teensy 4.x CPU.
>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>>> teensy4.x.
>>> Anyway, this works and I like it.
>>>
>>> Video: https://youtu.be/HYwgyYnQUxw
>>>
>>>
>>> -- 
>>> You received this message because you are subscribed to the Google 
>>> Groups "neonixie-l" group.
>>> To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to neonixie-l+...@googlegroups.com.
>>> To view this discussion on the web, visit 
>>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>>>  
>>> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>>> -- 
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Re: [neonixie-l] ScopeClock with teensy4.0

[Nicholas Stock]

Definitely not off-topic! I think everyone on this forum appreciates that
post, well done. I really like the starfield effect. What tube were you
using? Looks like it has very good linearity across the whole screen

Cheers,

Nick

On Sat, Mar 4, 2023 at 11:55 PM Wo Tu  wrote:

> Hi !
> Really interesting and great work. Looks really good and its a „want to
> have“.
> Would be interested in pcb and code too , if possible a kit too.
> Thank you.
>
> Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:
>
>> I am very interested as well.
>>
>>
>>
>> Would love to have the code and pcb design and even a kit.
>>
>>
>>
>> I read through the posts, but didn’t see anything other than the video.
>> Thumbs up on it too.   😊
>>
>>
>>
>> Michail Wilson
>>
>> 206-920-6312 <(206)%20920-6312>
>>
>>
>>
>> *From:* neoni...@googlegroups.com  *On Behalf
>> Of *jörg
>> *Sent:* Saturday, March 4, 2023 7:14 AM
>> *To:* neonixie-l 
>> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>>
>>
>>
>> @Jon,
>>
>>
>> yes, I will share the code. I have moved it to the VS Code IDE with
>> PlatformIO. I do not like the Arduino IDE much. It should run on david's
>> hardware, too.
>> Do yo you have build the hardware already?
>>
>> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>>
>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in
>> my latest version. I had to reduce the DAC rate by half. It looks just as
>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>
>>
>>
>>
>>
>>
>>
>> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>>
>> Hi, maybe a bit offtopic.
>>
>> I've put some effort in using the teensy4.x to run the scope clock based
>> on david forbes one.
>> The teensy3.6 based one is running on my own hardware for a while.
>>
>> But because of CPU shortage and the use of the teensy3.6 internal DAC's,
>> I was curious to get the stuff up and running on the faster teensy 4.x CPU.
>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The
>> usage of a serial DAC was too slow and I did not get DMA up and running on
>> teensy4.x.
>> Anyway, this works and I like it.
>>
>> Video: https://youtu.be/HYwgyYnQUxw
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "neonixie-l" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to neonixie-l+...@googlegroups.com.
>> To view this discussion on the web, visit
>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
>> --
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>> "neonixie-l" group.
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>> email to neonixie-l+...@googlegroups.com.
>>
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>> <https://groups.google.com/d/msgid/neonixie-l/bc1f2bea-aa6f-4890-bcc9-4b3104b444c7n%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
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Re: [neonixie-l] ScopeClock with teensy4.0

[Wo Tu]

Hi !
Really interesting and great work. Looks really good and its a „want to 
have“.
Would be interested in pcb and code too , if possible a kit too.
Thank you.

Michail Wilson schrieb am Samstag, 4. März 2023 um 15:11:01 UTC+1:

> I am very interested as well.
>
>  
>
> Would love to have the code and pcb design and even a kit.
>
>  
>
> I read through the posts, but didn’t see anything other than the video.   
> Thumbs up on it too.   😊
>
>  
>
> Michail Wilson
>
> 206-920-6312 <(206)%20920-6312>
>
>  
>
> *From:* neoni...@googlegroups.com  *On Behalf 
> Of *jörg
> *Sent:* Saturday, March 4, 2023 7:14 AM
> *To:* neonixie-l 
> *Subject:* Re: [neonixie-l] ScopeClock with teensy4.0
>
>  
>
> @Jon,
>
>
> yes, I will share the code. I have moved it to the VS Code IDE with 
> PlatformIO. I do not like the Arduino IDE much. It should run on david's 
> hardware, too.
> Do yo you have build the hardware already?
>
> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>
> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
> latest version. I had to reduce the DAC rate by half. It looks just as good 
> as the old version. Of course, the DAC I chise is already unobtanium.
>
>  
>
>  
>
>  
>
> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>
> Hi, maybe a bit offtopic.
>
> I've put some effort in using the teensy4.x to run the scope clock based 
> on david forbes one.
> The teensy3.6 based one is running on my own hardware for a while.
>
> But because of CPU shortage and the use of the teensy3.6 internal DAC's, I 
> was curious to get the stuff up and running on the faster teensy 4.x CPU.
> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
> usage of a serial DAC was too slow and I did not get DMA up and running on 
> teensy4.x.
> Anyway, this works and I like it.
>
> Video: https://youtu.be/HYwgyYnQUxw
>
>
> -- 
> You received this message because you are subscribed to the Google Groups 
> "neonixie-l" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to neonixie-l+...@googlegroups.com.
> To view this discussion on the web, visit 
> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>  
> <https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
> -- 
> You received this message because you are subscribed to the Google Groups 
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>  
> <https://groups.google.com/d/msgid/neonixie-l/bc1f2bea-aa6f-4890-bcc9-4b3104b444c7n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>

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RE: [neonixie-l] ScopeClock with teensy4.0

[Michail Wilson]

I am very interested as well.

Would love to have the code and pcb design and even a kit.

I read through the posts, but didn’t see anything other than the video.   
Thumbs up on it too.   😊

Michail Wilson
206-920-6312

From: neonixie-l@googlegroups.com  On Behalf Of 
jörg
Sent: Saturday, March 4, 2023 7:14 AM
To: neonixie-l 
Subject: Re: [neonixie-l] ScopeClock with teensy4.0

@Jon,
yes, I will share the code. I have moved it to the VS Code IDE with PlatformIO. 
I do not like the Arduino IDE much. It should run on david's hardware, too.
Do yo you have build the hardware already?
On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
latest version. I had to reduce the DAC rate by half. It looks just as good as 
the old version. Of course, the DAC I chise is already unobtanium.



On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
Hi, maybe a bit offtopic.

I've put some effort in using the teensy4.x to run the scope clock based on 
david forbes one.
The teensy3.6 based one is running on my own hardware for a while.

But because of CPU shortage and the use of the teensy3.6 internal DAC's, I was 
curious to get the stuff up and running on the faster teensy 4.x CPU.
In this approach I'm using a parallel driven 12 bit 4 channels DAC. The usage 
of a serial DAC was too slow and I did not get DMA up and running on teensy4.x.
Anyway, this works and I like it.

Video: https://youtu.be/HYwgyYnQUxw


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Re: [neonixie-l] ScopeClock with teensy4.0

[Jon Jackson]

@jörg,
No, I have not yet built anything. Just "scoping" out where this will take
me.

On Sat, Mar 4, 2023 at 5:14 AM jörg  wrote:

> @Jon,
> yes, I will share the code. I have moved it to the VS Code IDE with
> PlatformIO. I do not like the Arduino IDE much. It should run on david's
> hardware, too.
> Do yo you have build the hardware already?
>
> On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:
>
>> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in
>> my latest version. I had to reduce the DAC rate by half. It looks just as
>> good as the old version. Of course, the DAC I chise is already unobtanium.
>>
>>
>>
>> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>>
>>> Hi, maybe a bit offtopic.
>>>
>>> I've put some effort in using the teensy4.x to run the scope clock based
>>> on david forbes one.
>>> The teensy3.6 based one is running on my own hardware for a while.
>>>
>>> But because of CPU shortage and the use of the teensy3.6 internal DAC's,
>>> I was curious to get the stuff up and running on the faster teensy 4.x CPU.
>>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The
>>> usage of a serial DAC was too slow and I did not get DMA up and running on
>>> teensy4.x.
>>> Anyway, this works and I like it.
>>>
>>> Video: https://youtu.be/HYwgyYnQUxw
>>>
>>>
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "neonixie-l" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to neonixie-l+...@googlegroups.com.
>>> To view this discussion on the web, visit
>>> https://groups.google.com/d/msgid/neonixie-l/a2701743-2b9b-4543-a0c0-32b8b90da85an%40googlegroups.com
>>> 
>>> .
>>>
>> --
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> .
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Re: [neonixie-l] ScopeClock with teensy4.0

[Max Di Noi]

Hello, what transformer do you use for the power supply? I'm about to build 
that clock and I was thinking of winding my own transformer but if an off the 
shelf version can be used that's easier. Thank you. 
 Original message From: jörg  Date: 
04/03/2023  12:14  (GMT+00:00) To: neonixie-l  
Subject: Re: [neonixie-l] ScopeClock with teensy4.0 @Jon,yes, I will share the 
code. I have moved it to the VS Code IDE with PlatformIO. I do not like the 
Arduino IDE much. It should run on david's hardware, too.Do yo you have build 
the hardware already?On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes 
wrote:I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in 
my latest version. I had to reduce the DAC rate by half. It looks just as good 
as the old version. Of course, the DAC I chise is already unobtanium.On Thu, 
Mar 2, 2023, 7:17 AM jörg  wrote:Hi, maybe a bit 
offtopic.I've put some effort in using the teensy4.x to run the scope clock 
based on david forbes one.The teensy3.6 based one is running on my own hardware 
for a while.But because of CPU shortage and the use of the teensy3.6 internal 
DAC's, I was curious to get the stuff up and running on the faster teensy 4.x 
CPU.In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
usage of a serial DAC was too slow and I did not get DMA up and running on 
teensy4.x.Anyway, this works and I like it.Video: https://youtu.be/HYwgyYnQUxw



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Re: [neonixie-l] ScopeClock with teensy4.0

[jörg]

@Jon,
yes, I will share the code. I have moved it to the VS Code IDE with 
PlatformIO. I do not like the Arduino IDE much. It should run on david's 
hardware, too.
Do yo you have build the hardware already?

On Friday, March 3, 2023 at 5:12:46 AM UTC+1 David Forbes wrote:

> I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my 
> latest version. I had to reduce the DAC rate by half. It looks just as good 
> as the old version. Of course, the DAC I chise is already unobtanium.
>
>
>
> On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:
>
>> Hi, maybe a bit offtopic.
>>
>> I've put some effort in using the teensy4.x to run the scope clock based 
>> on david forbes one.
>> The teensy3.6 based one is running on my own hardware for a while.
>>
>> But because of CPU shortage and the use of the teensy3.6 internal DAC's, 
>> I was curious to get the stuff up and running on the faster teensy 4.x CPU.
>> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
>> usage of a serial DAC was too slow and I did not get DMA up and running on 
>> teensy4.x.
>> Anyway, this works and I like it.
>>
>> Video: https://youtu.be/HYwgyYnQUxw
>>
>>
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
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Re: [neonixie-l] ScopeClock with teensy4.0

[David Forbes]

I was able to change to a Teensy 4.1 with a 2 channel 12 bit SPI DAC in my
latest version. I had to reduce the DAC rate by half. It looks just as good
as the old version. Of course, the DAC I chise is already unobtanium.



On Thu, Mar 2, 2023, 7:17 AM jörg  wrote:

> Hi, maybe a bit offtopic.
>
> I've put some effort in using the teensy4.x to run the scope clock based
> on david forbes one.
> The teensy3.6 based one is running on my own hardware for a while.
>
> But because of CPU shortage and the use of the teensy3.6 internal DAC's, I
> was curious to get the stuff up and running on the faster teensy 4.x CPU.
> In this approach I'm using a parallel driven 12 bit 4 channels DAC. The
> usage of a serial DAC was too slow and I did not get DMA up and running on
> teensy4.x.
> Anyway, this works and I like it.
>
> Video: https://youtu.be/HYwgyYnQUxw
>
>
>
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> 
> .
>

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[neonixie-l] ScopeClock with teensy4.0

[jörg]

Hi, maybe a bit offtopic.

I've put some effort in using the teensy4.x to run the scope clock based on 
david forbes one.
The teensy3.6 based one is running on my own hardware for a while.

But because of CPU shortage and the use of the teensy3.6 internal DAC's, I 
was curious to get the stuff up and running on the faster teensy 4.x CPU.
In this approach I'm using a parallel driven 12 bit 4 channels DAC. The 
usage of a serial DAC was too slow and I did not get DMA up and running on 
teensy4.x.
Anyway, this works and I like it.

Video: https://youtu.be/HYwgyYnQUxw



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