Nixie 7977

[Pierre-Yves Clerson]

Hi,

I'm new to the Nixie world and I'm trying to setup what's explained here:

https://www.instructables.com/How-to-Control-a-Nixie-Tube-with-an-Arduino/

I fail right at the begining, being unable to test the Nixies. I have 4 model 7977, it doesn't work with any. I have the 12vdc Power Supply, the 12vdc to 180vdc converter, and I connect the anode to the ground.

You can see my setup on the attached pict.

Any help would be truly appreciated.

Many thx!

[Nicholas Stock]

Pierre, you'll need a resistor in line with the anode otherwise you'll fry the cathode. Try 10K or so to test the tube. Do you know that you have 170V on the output of the supply? That tube looks like an IN-1.

Welcome aboard!

Nick

Sent from my iPhone

On Mar 2, 2021, at 07:03, Pierre-Yves Clerson <pierreyv...@gmail.com> wrote:



<IMG_4072.jpg>

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[Paolo Cravero]

Not only you need the 10k resistor, but you need to ground a cathode. In ASCII drawing:

+HV ----- 10k -----[Anode || Desired Cathode] ---- GND

In your picture it looks reversed, whch is good since you didn't put the resistor.

Paolo

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[Pierre-Yves Clerson]

Hi Nick,

Thank you for your quick reply.

Is that mean I destroyed the cathodes while testing the tubes?

Pierre

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[Nicholas Stock]

Hi Pierre, did you see any light at all from the tube? You may be OK.....see Paolo's astute observation from his email.

Do you have a multimeter? Have you checked that you have 170V DC (or thereabouts) coming from the little power supply? 

Note, that the IN-1 tubes have a notoriously short life-span.....

Best,

Nick

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[Pierre-Yves Clerson]

Hi everybody,

Many thx for your quick replies, and sorry for my late one. Things are going fast here, except for that Nixie project.

I checked the Paolo schema, and woul dlike to check if I understood correctly. Could you just confirm my setup is OK on the attached picture?

My multimeter seems to malfunction, I'll check this out, the transformer I use is supposed to output 180V.

Thx again,

Pierre

[Richard Scales]

You only need a single 10k resistor in that circuit. 

In your picture, remove the one at the top with the yellow wires, you would be connecting the desired cathode directly to ground. 

Additionally, you have the tube connected back to front.

The circuit you need is as follows:

HV output to 10k resistor

10K resistor to Anode

Cathode to Ground

- Richard

[Pierre-Yves Clerson]

Hi Richard, many thx for your reply.

I assume if there is no result, the Nixie is burnt, right?

Pierre

[newxito]

Hi Pierre

You may need to check that the enable pin on your HV power supply is set to the correct level (depends on the model). 

[Michail Wilson]

Or simply check if there is 170volt coming from it with a volt meter.

 

Also, if you have swapped anode/cathode, something should still light up without damage.  There would be a glow.

 

Since you have it wired correctly (with a resistor) on the correct pins, even if the polarity is reversed, and you have 170volts output, then the tube is bad.  There is no harm trying other tubes to see.

 

Michail Wilson

206-920-6312

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[Pierre-Yves Clerson]

Hi Michael,

You mean with this screw, right?

BTW, I have 4 nixies, and no one respond, maybe they are all burnt (maybe they were already burnt when the were shipped :o/

Thx again!

[Aiden Fang]

The power module you bought is a counterfeit one! Mr. Zeyuan Yan is the designer, who is also on this board.

The NCH6100HV has been replaced by a newer model, NCH6300HV, last December. Please see the link below for the genuine one.

https://omnixie.com/products/nch6300hv-nixie-hv-power-module

[Michail Wilson]

How could you tell it was fake?   Ummm, hehe.

 

It’s not like the word Nixie was misspelled or anything.  LOL

Ohhhh, it was!

 

Michail Wilson

206-920-6312

 

From: neoni...@googlegroups.com <neoni...@googlegroups.com> On Behalf Of Aiden Fang
Sent: Monday, March 22, 2021 9:24 AM
To: neonixie-l <neoni...@googlegroups.com>
Subject: Re: [neonixie-l] Nixie 7977

 

The power module you bought is a counterfeit one! Mr. Zeyuan Yan is the designer, who is also on this board.

 

The NCH6100HV has been replaced by a newer model, NCH6300HV, last December. Please see the link below for the genuine one.

 

https://omnixie.com/products/nch6300hv-nixie-hv-power-module

 

 

 

 

 

On Monday, March 22, 2021 at 7:43:03 AM UTC-7 pierreyv...@gmail.com wrote:

Hi Michael,

 

You mean with this screw, right?

 

BTW, I have 4 nixies, and no one respond, maybe they are all burnt (maybe they were already burnt when the were shipped :o/

 

Thx again!

 

 

Le dimanche 14 mars 2021 à 13 h 06 min 32 s UTC-4, M1 a écrit :

Or simply check if there is 170volt coming from it with a volt meter.

 

Also, if you have swapped anode/cathode, something should still light up without damage.  There would be a glow.

 

Since you have it wired correctly (with a resistor) on the correct pins, even if the polarity is reversed, and you have 170volts output, then the tube is bad.  There is no harm trying other tubes to see.

 

Michail Wilson

206-920-6312

 

From: neoni...@googlegroups.com <neoni...@googlegroups.com> On Behalf Of newxito
Sent: Sunday, March 14, 2021 8:45 AM
To: neonixie-l <neoni...@googlegroups.com>
Subject: Re: [neonixie-l] Nixie 7977

 

Hi Pierre

You may need to check that the enable pin on your HV power supply is set to the correct level (depends on the model). 

 

 

 

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[Michail Wilson]

From the picture, I can’t tell how you have it wired.  It appears you don’t even have the outputs connected to anything.

 

You should have 12volt+ going to the input side.  If it were a legit power supply, you wouldn’t need to connect anything to the shunt (disable).  Since it’s a clone, I can’t be sure.

 

On the output side (the contacts at the bottom of the picture), you should use a DMM (multimeter) to see if you’re getting 170v from the unit.  If you are, then the power supply should be fine.

 

Now, with those two wires from the unit, you connect to your tube.  Anode to anode and cathode to any of the cathodes of the tube, BUT, use a resistor.

 

My suggestion is to test with a DMM first, and then take a picture of your connections prior to powering up so that any of us can take a look and reply.

 

Michail Wilson

206-920-6312

 

From: neoni...@googlegroups.com <neoni...@googlegroups.com> On Behalf Of Pierre-Yves Clerson
Sent: Monday, March 22, 2021 7:43 AM
To: neonixie-l <neoni...@googlegroups.com>
Subject: Re: [neonixie-l] Nixie 7977

 

Hi Michael,

 

You mean with this screw, right?

 

BTW, I have 4 nixies, and no one respond, maybe they are all burnt (maybe they were already burnt when the were shipped :o/

 

Thx again!

 

 

Le dimanche 14 mars 2021 à 13 h 06 min 32 s UTC-4, M1 a écrit :

Or simply check if there is 170volt coming from it with a volt meter.

 

Also, if you have swapped anode/cathode, something should still light up without damage.  There would be a glow.

 

Since you have it wired correctly (with a resistor) on the correct pins, even if the polarity is reversed, and you have 170volts output, then the tube is bad.  There is no harm trying other tubes to see.

 

Michail Wilson

206-920-6312

 

From: neoni...@googlegroups.com <neoni...@googlegroups.com> On Behalf Of newxito
Sent: Sunday, March 14, 2021 8:45 AM
To: neonixie-l <neoni...@googlegroups.com>
Subject: Re: [neonixie-l] Nixie 7977

 

Hi Pierre

You may need to check that the enable pin on your HV power supply is set to the correct level (depends on the model). 

 

 

 

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[Yohan Park]

Who sold you these tubes as 7977?
They're IN-1 tubes from Russia, not Burroughs 7977

[Pierre-Yves Clerson]

Hi everybody,

Many thx for your help. Sorry for late reply, I don't know why, my email software doesn't show up your replies.

w30, my son bought it 2 years ago on ebay, I had to investigate to identify the model. Obviously I was wrong.

I'm sorry I bought a counterfeit model. Maybe it just doesn't work at all. I'm able to light up a led on the output, but it fired 2 multimeters.

I will buy the one from Mr. Zeyuan Yan.

Thx again!