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 <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 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
<nixie...@gmail.com> 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
<flata...@gmail.com> 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 <hip...@gmail.com> 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 <pos...@gmail.com> 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
<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
<tel:(206)%20920-6312>
*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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