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Old 04-16-2012, 10:47 PM #1
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Default DIY HeNe PSU?

Hey everyone - I recently got a little tiny 5" HeNe tube, and I am looking to make the smallest possible PSU to go with it (planning it for a handheld).

Anyone have any ideas on how I can drive this? I am looking for schematics, but I can't seem to find any except on Sam's Laser FAQ and his schematics are very difficult for me to read.

Anyway, I'm thinking something along the lines of a boost driver up to around 50V or something (I know some simple boost drivers can do that), followed by a voltage multiplier and then a ballast resistor, and I can add a pulse at start up with a 555 timer or something along those lines.

Does it sound like it could work?


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Old 04-16-2012, 11:00 PM #2
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Default Re: DIY HeNe PSU?

HeNe tubes like 1000-1750V @ >3mA, even for small ones. You would need one hell of a voltage multiplier to get from 50V to 1250V, and lose a LOT of current in doing so.

I've never built one but I've seen it done by making a flyback driver and running it at the lowest voltage it will go and then filtering the output with HV capacitors and using a Zener Diode string (with lots of 100V zeners) to regulate the voltage and a HV resistor to limit current to the required level. It was NOT tiny nor cheap.

A simple low (or even operational level) voltage pulse is not enough to ignite the tube, typically you need either RF freqiencies at a couple of watts or a very high voltage pulse (>6000V) to start even a small tube.

IMO just buy a power supply, you can get a nice JDSU 12V brick for less than $40.
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Old 04-16-2012, 11:05 PM #3
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Default Re: DIY HeNe PSU?

I know - I figured I would construct the voltage multiplier such that it would have additional stages for said pulse - the 555 timer would simply be a trigger is all.

Anyway, I think I will undertake this project. I think the first place to start would be to obtain the smallest transformer I can for the highest turn ratio.
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Old 04-16-2012, 11:42 PM #4
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Default Re: DIY HeNe PSU?

It might be easier to rectify, filter, zener regulate, and current limit a small SMPS Neon Sign Power supply or small NST.

Heck, you could do it with a MOT but that is the antithesis of "small".
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Old 04-16-2012, 11:45 PM #5
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Default Re: DIY HeNe PSU?

If I could find a small enough neon sign power supply, that would be awesome ^_^
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Old 04-16-2012, 11:54 PM #6
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Default Re: DIY HeNe PSU?

How about this?
Neon Power Drive Supply "Transformer Solid State" NEW Marshall Electric | eBay


Then of course, there is always: http://www.ebay.com/itm/HELIUM-NEON-...item1c2522251f
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Old 04-17-2012, 01:22 AM #7
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Default Re: DIY HeNe PSU?

Both of those are too big
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Old 04-17-2012, 01:30 AM #8
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Default Re: DIY HeNe PSU?

How small is still too big? What are the dimensions you are looking for?

how does this sound?
NEONX8 - 4Kv open circuit at 15 ma short circuit, requiring 12 vdc at 1 amp. Open frame. 4-1/4" x 1" x 1-3/8". Easily generates 20 kv at 1 ma with our five stage multiplier. UL approved unit.
http://www.amazing1.com/profneon.htm

PDF instructions including "multiplier circuit" http://www.amazing1.com/download/MINIMAX4-NEONX8INS.pdf
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Old 04-17-2012, 01:32 AM #9
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Default Re: DIY HeNe PSU?

I'm looking for something that is about as big as the tube itself. Possible 4-5 inches long at most and fitting in a tube about an inch in diameter.
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Old 04-17-2012, 01:50 AM #10
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Default Re: DIY HeNe PSU?

Finding something that will fit inside a 1" tube might be challenging. Here is something on a board that you might be able to reconfigure to meet your needs.
3,000 volts, 10 milliamps 2.5 " x 1 " x 1.25"

NEW NEON TRANSFORMER 3,000v 3KV clock speaker etc. | eBay

What output voltage and current do you need?
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Old 04-17-2012, 02:19 AM #11
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Default Re: DIY HeNe PSU?

Need about 1kV at 4.5mA for continuous and about an 8kV trigger. I'll take a look at that though... that looks small.
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Old 04-17-2012, 02:27 AM #12
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Default Re: DIY HeNe PSU?

I think you could wind a transformer for that. Have a 12v input and wind 10:1000 or 20:2000. You could use a 555 plus transistor to drive the transformer then have a 3 stage multiplier to provide the trigger.
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Old 04-17-2012, 03:03 AM #13
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Default Re: DIY HeNe PSU?

Here's another brick style but cheaper. eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

They not that big and work great.
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Old 04-17-2012, 03:13 AM #14
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Default Re: DIY HeNe PSU?

I have some flybacks here if you need em. Dont know much about hene's but I have both DC and AC flybacks. Let me know if you need one. All of my flybacks are NEW and never used.
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Old 04-17-2012, 03:15 AM #15
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Default Re: DIY HeNe PSU?

Only problem is that flybacks are huge :P
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Old 04-17-2012, 03:20 AM #16
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Default Re: DIY HeNe PSU?

The AC flyback Is probably MUCH larger than you want. However the DC flybacks i have are not too large. If you change your mind just hit up my pm box . Btw didnt forget about the xmas gift . Its on my giant list of things to do
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