Re: [neonixie-l] NIMO

[Anthony]

Ah! I have been following your channel for some time, and just made the 
connection today that you are active on the Google group as well! I was 
very excited for you when I saw the box of NIMOs! 

On Monday, October 5, 2020 at 10:42:41 AM UTC-4 astroschmidt wrote:

> Hi Martin,
>
> here´s another YouTube video where I unbox the Ebay-auction package (if 
> you haven´t already found it):
> https://youtu.be/7Mprac_anEA
>
> If I find the time I will scan the documents that were included in the 
> Ebay-auction and share them here.
> .
> The five tube mounting bracket is ATM under use in the prototype.
> I will take photos of the bracket and the bezel, when I am ready with the 
> clock enclosure.
>
> Best regards
> Roger 
>
> Dekatron42 schrieb am Montag, 5. Oktober 2020 um 14:33:00 UTC+2:
>
>> Would it be possible for you to share the circuit diagrams that you got 
>> in the box with the tubes, I haven't seen some of them, just the datasheet.
>>
>> Also, can you share some photos of the mechanical pieces in the package, 
>> like photos of the five tube mounting bracket and of the power supply (saw 
>> some photos in the video)?
>>
>> /Martin
>>
>> On Monday, 5 October 2020 14:09:07 UTC+2, astroschmidt wrote:
>>>
>>> Hi Jörg,
>>>
>>> as I lately got 10 NIMOs in an Ebay auction and am currently also 
>>> working on a 6 tube NIMO-clock I can sell you a tube from my spares.
>>> YouTube NIMO-Clock Update#2 
>>> YouTube NIMO-Clock Update#1 
>>>
>>> Please PM me.
>>> Roger
>>> jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2:
>>>
 So, if there is someone in the group, who is willing to sell a nimo 
 which might join the other five, pls. pm me.

 jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2:

> Martin, you are right.
> I've checked the getter flash and it is gone. Only a white shadow left.
> So, sadly, the tube has sucked air and is cracked somewhere at the 
> pins.
> Unfortunately, I don't have a plasma ball.
>
> Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2:
>
>> Have you got a Plasma ball to hold it to? If air has entered in you 
>> might see a very faint blueish glow if you turn off the surrounding 
>> light.
>>
>> What does the getter flash look like, like a mirror or is it gone 
>> completely, or has it gone white?
>>
>> I have seen a few Nixies where the Anode wire has come lose at a 
>> welding spot, can you see if something similar has happened to your Nimo 
>> with any of the wires or the Anode connection - if so you might smack it 
>> gently against your palm to see if the wire reconnects enough for it to 
>> work again?
>>
>> /Martin
>>
>> On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote:
>>>
>>> Hi Gregebert, yes, I've checked the tube several times. The cold 
>>> resistance is about 2,1 ohm, which is identical to the other tubes.
>>> Just swapped the tube with a running one on the same driver board. 
>>> Sadly, no function at all. Under a microscope, no crack is visible.
>>>
>>> I've made a short video to show the difference between a neon-nixie 
>>> and a nimo crt-tube and a neodym magnet (very small one.)
>>> https://www.youtube.com/watch?v=JJytnrvTy3Q
>>>
>>> gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2:
>>>
 Jorg - Regarding the dead tube, have you compared the filament 
 resistance of the bad tube to the others ?

 NIMO tubes have 2 parallel filaments, so if one is open, the 
 resistance will be TWICE the value of a good tube.
 I think the cold resistance is around 3 ohms.

 If 1 filament is out, you can still get 5 numerals to work.

 I would be surprised if both filaments are burned-out, unless 
 someone put way too much voltage on it, or the tube is cracked around 
 the 
 pins.

 If the filaments are OK, power-up the tube and make sure you get 
 around 180mA of current.
 Then try varying the voltage between the filament and the logic 
 driving the grids. If a grid is about 6 V more positive than the 
 filament, 
 you should get a numeral to turn on.

 On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote:

> Short update of my nimo project.
> I've got 5 tubes running. The sixt is unfortunately DOA.
> The tubes filaments are driven with three power supplies, with 
> soft start IC (load switch).
> So the filament gets started very smooth.
> I've made some experiments with multiplexing the tubes. 
> Which work nice, using the method described in the manual. The 
> bias voltage is changed for every tube, that should be on/off.
> In the actual approch, I'm 

Re: [neonixie-l] New clock project with R|Z568M nixies

[gregebert]

2 meters of cat6 cable (AGW 23) is about 0.16 ohms, plus any connectors. 
Since you are drawing 300mA or less, the voltage drop will be  50mV or less.

On Monday, October 5, 2020 at 3:42:48 PM UTC-7 newxito wrote:

> Forgot to mention that I will use the pairs as sugggested by Greg

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Re: [neonixie-l] New clock project with R|Z568M nixies

[newxito]

Forgot to mention that I will use the pairs as sugggested by Greg

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Re: [neonixie-l] NIMO

[Nicholas Stock]

Ahso it was you that bought those NIMO's. :)

On Mon, Oct 5, 2020 at 7:42 AM astroschmidt 
wrote:

> Hi Martin,
>
> here´s another YouTube video where I unbox the Ebay-auction package (if
> you haven´t already found it):
> https://youtu.be/7Mprac_anEA
>
> If I find the time I will scan the documents that were included in the
> Ebay-auction and share them here.
> .
> The five tube mounting bracket is ATM under use in the prototype.
> I will take photos of the bracket and the bezel, when I am ready with the
> clock enclosure.
>
> Best regards
> Roger
>
> Dekatron42 schrieb am Montag, 5. Oktober 2020 um 14:33:00 UTC+2:
>
>> Would it be possible for you to share the circuit diagrams that you got
>> in the box with the tubes, I haven't seen some of them, just the datasheet.
>>
>> Also, can you share some photos of the mechanical pieces in the package,
>> like photos of the five tube mounting bracket and of the power supply (saw
>> some photos in the video)?
>>
>> /Martin
>>
>> On Monday, 5 October 2020 14:09:07 UTC+2, astroschmidt wrote:
>>>
>>> Hi Jörg,
>>>
>>> as I lately got 10 NIMOs in an Ebay auction and am currently also
>>> working on a 6 tube NIMO-clock I can sell you a tube from my spares.
>>> YouTube NIMO-Clock Update#2 
>>> YouTube NIMO-Clock Update#1 
>>>
>>> Please PM me.
>>> Roger
>>> jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2:
>>>
 So, if there is someone in the group, who is willing to sell a nimo
 which might join the other five, pls. pm me.

 jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2:

> Martin, you are right.
> I've checked the getter flash and it is gone. Only a white shadow left.
> So, sadly, the tube has sucked air and is cracked somewhere at the
> pins.
> Unfortunately, I don't have a plasma ball.
>
> Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2:
>
>> Have you got a Plasma ball to hold it to? If air has entered in you
>> might see a very faint blueish glow if you turn off the surrounding 
>> light.
>>
>> What does the getter flash look like, like a mirror or is it gone
>> completely, or has it gone white?
>>
>> I have seen a few Nixies where the Anode wire has come lose at a
>> welding spot, can you see if something similar has happened to your Nimo
>> with any of the wires or the Anode connection - if so you might smack it
>> gently against your palm to see if the wire reconnects enough for it to
>> work again?
>>
>> /Martin
>>
>> On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote:
>>>
>>> Hi Gregebert, yes, I've checked the tube several times. The cold
>>> resistance is about 2,1 ohm, which is identical to the other tubes.
>>> Just swapped the tube with a running one on the same driver board.
>>> Sadly, no function at all. Under a microscope, no crack is visible.
>>>
>>> I've made a short video to show the difference between a neon-nixie
>>> and a nimo crt-tube and a neodym magnet (very small one.)
>>> https://www.youtube.com/watch?v=JJytnrvTy3Q
>>>
>>> gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2:
>>>
 Jorg - Regarding the dead tube, have you compared the filament
 resistance of the bad tube to the others ?

 NIMO tubes have 2 parallel filaments, so if one is open, the
 resistance will be TWICE the value of a good tube.
 I think the cold resistance is around 3 ohms.

 If 1 filament is out, you can still get 5 numerals to work.

 I would be surprised if both filaments are burned-out, unless
 someone put way too much voltage on it, or the tube is cracked around 
 the
 pins.

 If the filaments are OK, power-up the tube and make sure you get
 around 180mA of current.
 Then try varying the voltage between the filament and the logic
 driving the grids. If a grid is about 6 V more positive than the 
 filament,
 you should get a numeral to turn on.

 On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote:

> Short update of my nimo project.
> I've got 5 tubes running. The sixt is unfortunately DOA.
> The tubes filaments are driven with three power supplies, with
> soft start IC (load switch).
> So the filament gets started very smooth.
> I've made some experiments with multiplexing the tubes.
> Which work nice, using the method described in the manual. The
> bias voltage is changed for every tube, that should be on/off.
> In the actual approch, I'm using direct driving the tubes via
> 74HC595 shift registers. Got a plenty of problems at the beginning.
> The power and signal lines for the 595 were messed with switching

Re: [neonixie-l] New clock project with R|Z568M nixies

[newxito]

That’s a lot of useful information, thanks Nick, thanks Greg. 
I will follow your advices in order to avoid problems with the ground. I 
will give CAT6 a try but first I will make some tests and measure the 
voltage drop, the wires are very thin and I expect a total cable length of 
2m.  
On the 170V pair I expect 6W and about 1.5W on the 5V pair.

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Re: [neonixie-l] New clock project with R|Z568M nixies

[gregebert]

CAT6 is a good idea; use pairs for 

   - +170VDC/GND
   - VCC/GND
   - SCL/VCC
   - SDA/VCC


If you recall, I2C uses pullup resistors, which is why you use VCC as the 
other signal in the pair. For SCL, put the termination resistor at the 
receiving end. Even though the termination resistance (typically 1K)  does 
not match the impedance of the twisted-pair (100 ohms), the reflections 
shouldn't be severe as long as the driving device doesn't have fast rise & 
fall times. I2C is rather slow (400kbit/sec), so rise/fall times will be 
much longer than the delay along your cable. If you do see reflections on a 
scope, you can try lowering the termination resistance, but that will put 
more load on the driving device. SDA is a bit trickier because it's 
bidirectional; I'm tempted to say start-out with 2K at each end and see 
what happens.

Next, be careful about ground loops. Dont connect the metal enclosure 
directly to your circuit ground; use a 1Meg resistor. As much as possible, 
follow guidelines for PCB layout to minimize ground loops, and you should 
be OK when you connect them together thru the cable. 

As long as you filter-out the high-frequency noise on the +170V, there wont 
be any radiated noise. And if you use a twisted pair, it's even lower. I 
would put 0.01uF caps at each end of the cable. Same for the lower voltage 
supply.

I have a multi-board RZ568m clock I'm building, and it's also using a 
serial protocol for displaying info on the tubes, reading pushbutton 
switches, controlling panel lamps, etc. We'll see how well it works out. 
Normally I dont use so many serial-connected devices but this saved me a 
lot of pins on the FPGA so I decided to give it a try.

On Monday, October 5, 2020 at 3:00:21 AM UTC-7 newxito wrote:

> I’m a little bit concerned about generating a lot of EMI in this project. 
> I’ve added an image, so you can see what I’m trying to do. The controller 
> will be hidden in the base of this old lamp. I will need 5 wires going all 
> the way up into a horizontal tube. The nixies will be mounted with the 
> sockets on top of the horizontal tube. 
> The 5 wires are +170V, +5V, ground, SDA and SCL.
>  I’m concerned about the long 170V wire. Will this act as an antenna? 
> The wires will run inside metal tubes. Will this attenuate the EMI?   
> Should I twist all the wires together? Only SDA and SCL? 
> I was considering using a Cat6 cable and use one of the 4 twisted pairs 
> for the 170V, one for 5V, one for ground and one for SDA and SCL but I’m 
> not sure if that is a good idea.
> Probably I should buy some kind of EMI meter and stop asking questions :-)
>
>

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Re: [neonixie-l] NIMO

[astroschmidt]

 Hi Martin,

here´s another YouTube video where I unbox the Ebay-auction package (if you 
haven´t already found it):
https://youtu.be/7Mprac_anEA

If I find the time I will scan the documents that were included in the 
Ebay-auction and share them here.
.
The five tube mounting bracket is ATM under use in the prototype.
I will take photos of the bracket and the bezel, when I am ready with the 
clock enclosure.

Best regards
Roger 

Dekatron42 schrieb am Montag, 5. Oktober 2020 um 14:33:00 UTC+2:

> Would it be possible for you to share the circuit diagrams that you got in 
> the box with the tubes, I haven't seen some of them, just the datasheet.
>
> Also, can you share some photos of the mechanical pieces in the package, 
> like photos of the five tube mounting bracket and of the power supply (saw 
> some photos in the video)?
>
> /Martin
>
> On Monday, 5 October 2020 14:09:07 UTC+2, astroschmidt wrote:
>>
>> Hi Jörg,
>>
>> as I lately got 10 NIMOs in an Ebay auction and am currently also working 
>> on a 6 tube NIMO-clock I can sell you a tube from my spares.
>> YouTube NIMO-Clock Update#2 
>> YouTube NIMO-Clock Update#1 
>>
>> Please PM me.
>> Roger
>> jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2:
>>
>>> So, if there is someone in the group, who is willing to sell a nimo 
>>> which might join the other five, pls. pm me.
>>>
>>> jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2:
>>>
 Martin, you are right.
 I've checked the getter flash and it is gone. Only a white shadow left.
 So, sadly, the tube has sucked air and is cracked somewhere at the pins.
 Unfortunately, I don't have a plasma ball.

 Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2:

> Have you got a Plasma ball to hold it to? If air has entered in you 
> might see a very faint blueish glow if you turn off the surrounding light.
>
> What does the getter flash look like, like a mirror or is it gone 
> completely, or has it gone white?
>
> I have seen a few Nixies where the Anode wire has come lose at a 
> welding spot, can you see if something similar has happened to your Nimo 
> with any of the wires or the Anode connection - if so you might smack it 
> gently against your palm to see if the wire reconnects enough for it to 
> work again?
>
> /Martin
>
> On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote:
>>
>> Hi Gregebert, yes, I've checked the tube several times. The cold 
>> resistance is about 2,1 ohm, which is identical to the other tubes.
>> Just swapped the tube with a running one on the same driver board. 
>> Sadly, no function at all. Under a microscope, no crack is visible.
>>
>> I've made a short video to show the difference between a neon-nixie 
>> and a nimo crt-tube and a neodym magnet (very small one.)
>> https://www.youtube.com/watch?v=JJytnrvTy3Q
>>
>> gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2:
>>
>>> Jorg - Regarding the dead tube, have you compared the filament 
>>> resistance of the bad tube to the others ?
>>>
>>> NIMO tubes have 2 parallel filaments, so if one is open, the 
>>> resistance will be TWICE the value of a good tube.
>>> I think the cold resistance is around 3 ohms.
>>>
>>> If 1 filament is out, you can still get 5 numerals to work.
>>>
>>> I would be surprised if both filaments are burned-out, unless 
>>> someone put way too much voltage on it, or the tube is cracked around 
>>> the 
>>> pins.
>>>
>>> If the filaments are OK, power-up the tube and make sure you get 
>>> around 180mA of current.
>>> Then try varying the voltage between the filament and the logic 
>>> driving the grids. If a grid is about 6 V more positive than the 
>>> filament, 
>>> you should get a numeral to turn on.
>>>
>>> On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote:
>>>
 Short update of my nimo project.
 I've got 5 tubes running. The sixt is unfortunately DOA.
 The tubes filaments are driven with three power supplies, with soft 
 start IC (load switch).
 So the filament gets started very smooth.
 I've made some experiments with multiplexing the tubes. 
 Which work nice, using the method described in the manual. The bias 
 voltage is changed for every tube, that should be on/off.
 In the actual approch, I'm using direct driving the tubes via 
 74HC595 shift registers. Got a plenty of problems at the beginning.
 The power and signal lines for the 595 were messed with switching 
 noise. Some caps did the trick.
 Really nice to view the working tubes.

 Video: https://www.youtube.com/watch?v=JbwfZhYhnlo

 jörg schrieb am Mittwoch, 15. Juli 2020 

Re: [neonixie-l] NIMO

[Dekatron42]

Would it be possible for you to share the circuit diagrams that you got in 
the box with the tubes, I haven't seen some of them, just the datasheet.

Also, can you share some photos of the mechanical pieces in the package, 
like photos of the five tube mounting bracket and of the power supply (saw 
some photos in the video)?

/Martin

On Monday, 5 October 2020 14:09:07 UTC+2, astroschmidt wrote:
>
> Hi Jörg,
>
> as I lately got 10 NIMOs in an Ebay auction and am currently also working 
> on a 6 tube NIMO-clock I can sell you a tube from my spares.
> YouTube NIMO-Clock Update#2 
> YouTube NIMO-Clock Update#1 
>
> Please PM me.
> Roger
> jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2:
>
>> So, if there is someone in the group, who is willing to sell a nimo which 
>> might join the other five, pls. pm me.
>>
>> jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2:
>>
>>> Martin, you are right.
>>> I've checked the getter flash and it is gone. Only a white shadow left.
>>> So, sadly, the tube has sucked air and is cracked somewhere at the pins.
>>> Unfortunately, I don't have a plasma ball.
>>>
>>> Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2:
>>>
 Have you got a Plasma ball to hold it to? If air has entered in you 
 might see a very faint blueish glow if you turn off the surrounding light.

 What does the getter flash look like, like a mirror or is it gone 
 completely, or has it gone white?

 I have seen a few Nixies where the Anode wire has come lose at a 
 welding spot, can you see if something similar has happened to your Nimo 
 with any of the wires or the Anode connection - if so you might smack it 
 gently against your palm to see if the wire reconnects enough for it to 
 work again?

 /Martin

 On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote:
>
> Hi Gregebert, yes, I've checked the tube several times. The cold 
> resistance is about 2,1 ohm, which is identical to the other tubes.
> Just swapped the tube with a running one on the same driver board. 
> Sadly, no function at all. Under a microscope, no crack is visible.
>
> I've made a short video to show the difference between a neon-nixie 
> and a nimo crt-tube and a neodym magnet (very small one.)
> https://www.youtube.com/watch?v=JJytnrvTy3Q
>
> gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2:
>
>> Jorg - Regarding the dead tube, have you compared the filament 
>> resistance of the bad tube to the others ?
>>
>> NIMO tubes have 2 parallel filaments, so if one is open, the 
>> resistance will be TWICE the value of a good tube.
>> I think the cold resistance is around 3 ohms.
>>
>> If 1 filament is out, you can still get 5 numerals to work.
>>
>> I would be surprised if both filaments are burned-out, unless someone 
>> put way too much voltage on it, or the tube is cracked around the pins.
>>
>> If the filaments are OK, power-up the tube and make sure you get 
>> around 180mA of current.
>> Then try varying the voltage between the filament and the logic 
>> driving the grids. If a grid is about 6 V more positive than the 
>> filament, 
>> you should get a numeral to turn on.
>>
>> On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote:
>>
>>> Short update of my nimo project.
>>> I've got 5 tubes running. The sixt is unfortunately DOA.
>>> The tubes filaments are driven with three power supplies, with soft 
>>> start IC (load switch).
>>> So the filament gets started very smooth.
>>> I've made some experiments with multiplexing the tubes. 
>>> Which work nice, using the method described in the manual. The bias 
>>> voltage is changed for every tube, that should be on/off.
>>> In the actual approch, I'm using direct driving the tubes via 
>>> 74HC595 shift registers. Got a plenty of problems at the beginning.
>>> The power and signal lines for the 595 were messed with switching 
>>> noise. Some caps did the trick.
>>> Really nice to view the working tubes.
>>>
>>> Video: https://www.youtube.com/watch?v=JbwfZhYhnlo
>>>
>>> jörg schrieb am Mittwoch, 15. Juli 2020 um 18:01:18 UTC+2:
>>>
 I‘m using Eagle to layout. 
 It takes time for me to feel comfortable with it. 
 And Fusion360. 



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Re: [neonixie-l] NIMO

[astroschmidt]

Hi Jörg,

as I lately got 10 NIMOs in an Ebay auction and am currently also working 
on a 6 tube NIMO-clock I can sell you a tube from my spares.
YouTube NIMO-Clock Update#2 
YouTube NIMO-Clock Update#1 

Please PM me.
Roger
jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2:

> So, if there is someone in the group, who is willing to sell a nimo which 
> might join the other five, pls. pm me.
>
> jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2:
>
>> Martin, you are right.
>> I've checked the getter flash and it is gone. Only a white shadow left.
>> So, sadly, the tube has sucked air and is cracked somewhere at the pins.
>> Unfortunately, I don't have a plasma ball.
>>
>> Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2:
>>
>>> Have you got a Plasma ball to hold it to? If air has entered in you 
>>> might see a very faint blueish glow if you turn off the surrounding light.
>>>
>>> What does the getter flash look like, like a mirror or is it gone 
>>> completely, or has it gone white?
>>>
>>> I have seen a few Nixies where the Anode wire has come lose at a welding 
>>> spot, can you see if something similar has happened to your Nimo with any 
>>> of the wires or the Anode connection - if so you might smack it gently 
>>> against your palm to see if the wire reconnects enough for it to work again?
>>>
>>> /Martin
>>>
>>> On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote:

 Hi Gregebert, yes, I've checked the tube several times. The cold 
 resistance is about 2,1 ohm, which is identical to the other tubes.
 Just swapped the tube with a running one on the same driver board. 
 Sadly, no function at all. Under a microscope, no crack is visible.

 I've made a short video to show the difference between a neon-nixie and 
 a nimo crt-tube and a neodym magnet (very small one.)
 https://www.youtube.com/watch?v=JJytnrvTy3Q

 gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2:

> Jorg - Regarding the dead tube, have you compared the filament 
> resistance of the bad tube to the others ?
>
> NIMO tubes have 2 parallel filaments, so if one is open, the 
> resistance will be TWICE the value of a good tube.
> I think the cold resistance is around 3 ohms.
>
> If 1 filament is out, you can still get 5 numerals to work.
>
> I would be surprised if both filaments are burned-out, unless someone 
> put way too much voltage on it, or the tube is cracked around the pins.
>
> If the filaments are OK, power-up the tube and make sure you get 
> around 180mA of current.
> Then try varying the voltage between the filament and the logic 
> driving the grids. If a grid is about 6 V more positive than the 
> filament, 
> you should get a numeral to turn on.
>
> On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote:
>
>> Short update of my nimo project.
>> I've got 5 tubes running. The sixt is unfortunately DOA.
>> The tubes filaments are driven with three power supplies, with soft 
>> start IC (load switch).
>> So the filament gets started very smooth.
>> I've made some experiments with multiplexing the tubes. 
>> Which work nice, using the method described in the manual. The bias 
>> voltage is changed for every tube, that should be on/off.
>> In the actual approch, I'm using direct driving the tubes via 74HC595 
>> shift registers. Got a plenty of problems at the beginning.
>> The power and signal lines for the 595 were messed with switching 
>> noise. Some caps did the trick.
>> Really nice to view the working tubes.
>>
>> Video: https://www.youtube.com/watch?v=JbwfZhYhnlo
>>
>> jörg schrieb am Mittwoch, 15. Juli 2020 um 18:01:18 UTC+2:
>>
>>> I‘m using Eagle to layout. 
>>> It takes time for me to feel comfortable with it. 
>>> And Fusion360. 
>>>
>>>

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Re: [neonixie-l] New clock project with R|Z568M nixies

[Nick Sargeant]

You seem to have already taken care of the normal recommendations. So, 
first make sure the metal tube is grounded at the base. Second, make sure 
that it doesn't connect to the ground at the far end of the tube near the 
nixies - that way, you will avoid signal currents using the tube itself as 
a return path. Third, switching of the HV for the tubes is at confined at 
the top, so no emissions issues there. There is a slight risk that the 
switching to create the 170v will leak on to the supply rail, but given you 
are carrying that inside the tube, really you've done as much as you need 
to already. I remember when TV sets had tubes, huge voltages and currents 
switching, with little more than a hardboard cover. 

On Monday, 5 October 2020 at 11:00:21 UTC+1 newxito wrote:

> I’m a little bit concerned about generating a lot of EMI in this project. 
> I’ve added an image, so you can see what I’m trying to do. The controller 
> will be hidden in the base of this old lamp. I will need 5 wires going all 
> the way up into a horizontal tube. The nixies will be mounted with the 
> sockets on top of the horizontal tube. 
> The 5 wires are +170V, +5V, ground, SDA and SCL.
>  I’m concerned about the long 170V wire. Will this act as an antenna? 
> The wires will run inside metal tubes. Will this attenuate the EMI?   
> Should I twist all the wires together? Only SDA and SCL? 
> I was considering using a Cat6 cable and use one of the 4 twisted pairs 
> for the 170V, one for 5V, one for ground and one for SDA and SCL but I’m 
> not sure if that is a good idea.
> Probably I should buy some kind of EMI meter and stop asking questions :-)
>
>

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Re: [neonixie-l] New clock project with R|Z568M nixies

[newxito]

I’m a little bit concerned about generating a lot of EMI in this project. 
I’ve added an image, so you can see what I’m trying to do. The controller 
will be hidden in the base of this old lamp. I will need 5 wires going all 
the way up into a horizontal tube. The nixies will be mounted with the 
sockets on top of the horizontal tube. 
The 5 wires are +170V, +5V, ground, SDA and SCL.
 I’m concerned about the long 170V wire. Will this act as an antenna? 
The wires will run inside metal tubes. Will this attenuate the EMI?   
Should I twist all the wires together? Only SDA and SCL? 
I was considering using a Cat6 cable and use one of the 4 twisted pairs for 
the 170V, one for 5V, one for ground and one for SDA and SCL but I’m not 
sure if that is a good idea.
Probably I should buy some kind of EMI meter and stop asking questions :-)

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Re: [neonixie-l] New clock project with R|Z568M nixies

[newxito]

Spinning nixies? That's cool, I hope that one day you will build this 
project!

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