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Forums
4hv.org :: Forums :: Tesla Coils
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Random Idea

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EvilTesla-RG
Fri Jul 03 2009, 01:48AM Print
EvilTesla-RG Registered Member #1523 Joined: Sat Jun 07 2008, 02:05PM
Location:
Posts: 97
I was working on minturizing a flash circuit for a Coil Gun I am building when I had an idea.

First off, is the type of Neon Bulb used in a Flash circuit any differnt (except for size) than a flashy store sign type Neon bulb?

Becouse, I have learned (as many of you probably already know) that the type of neon bulb in a flash circuit works much the same as a SCR.

This gave me an idea, why couldn't we replace spark gaps with Neon Bulbs?

This may sound wierd, but it might work. (becouse Neon bulbs arn't naturaly conductive) ANd the bulbs are much more effeicent than a spark gap.

Only one possible issue I can think of, that is the quenching ability of a neon bulb.


By some random chance has anyone tried this? Or does anyone know how well a Neon Bulb quenches?
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Bjørn
Fri Jul 03 2009, 02:15AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The gas would be different, Xenon instead of Neon.

What is the purpose of a flash tube? To convert as much energy as possible into visible light, so you should not expect very high efficiency when used as a switch. Most of them are also made for low duty cycle and will heat up and crack after a short while.
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EvilTesla-RG
Fri Jul 03 2009, 02:37AM
EvilTesla-RG Registered Member #1523 Joined: Sat Jun 07 2008, 02:05PM
Location:
Posts: 97
hmm...

they would still be more effeint than a spark gap

A fan could be used to cool it down...maby
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Arcstarter
Fri Jul 03 2009, 03:06AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
They would not be more efficient, as a ton of the energy will be converted to light, and still tons of heat.

They would crack even with low power after long i would also think, even if kept cool.

Also, are you talking about the thing that makes the really bright flash, or the orange dim glowing one? The light meant for the flash is xenon, and the orange dim one is neon. They would both suffer from the above mentioned things.
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TheBoozer
Fri Jul 03 2009, 08:49AM
TheBoozer Registered Member #1535 Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
Gas tubes designed for power discharge are manufactured. Here's an example:

Link2

I've seen them used in plasma cutters. In this application, a super miniature Tesla coil circuit is used to produce a 1/2 inch arc or so.

Using these to produce a small Tesla coil has been discussed somewhere here before, but I don't know if anyone built one.

As others mentioned in this thread, neon, and xenon tubes are probably a poor choice for a spark gap...

Rich
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EvilTesla-RG
Fri Jul 03 2009, 10:53PM
EvilTesla-RG Registered Member #1523 Joined: Sat Jun 07 2008, 02:05PM
Location:
Posts: 97
hmm...

alright, thanks anyway.
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TheBoozer
Fri Jul 03 2009, 11:59PM
TheBoozer Registered Member #1535 Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
Never give up on pondering... Your idea was sound. Without an occasional epiphany, our world would never have advanced to it's present technological level. Never stop with the "what if"....


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Proud Mary
Sat Jul 04 2009, 12:12AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
EvilTesla-RG wrote ...

This may sound wierd, but it might work. (becouse Neon bulbs arn't naturaly conductive) ANd the bulbs are much more effeicent than a spark gap.

Only one possible issue I can think of, that is the quenching ability of a neon bulb.


By some random chance has anyone tried this? Or does anyone know how well a Neon Bulb quenches?

It's not wierd at all. You have just re-discovered the thyratron, the triggered gas discharge valve.

Neon, however is not employed . Argon, and Argon-Mercury are used in 'slow' thyratrons, while hydrogen is the fill gas in fast devices for picosecond switching applications

Thyratrons are one of the few inventions of the thermionic age that have survived into the present. In some applications, where very large currents must be switched in picoseconds, thyratrons have yet to be replaced.

Thyratrons usually work into Rayleigh lines, where even quite small devices are able to switch 10kW peak power. Large thyratrons are able to produce megawatt pulses.

You stand a good chance of being killed outright by misuse of even one of the smaller devices.




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EvilTesla-RG
Sat Jul 04 2009, 02:20AM
EvilTesla-RG Registered Member #1523 Joined: Sat Jun 07 2008, 02:05PM
Location:
Posts: 97
thats interesting, thanks
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