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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
1) Put two zener diodes in "anti-series" and connect in parallel with the gate. 2) this means 1 microfarad film or foil capacitor (non-polar). 3) try 20 turns at first. Oscilloscope is essential to check if the waveform on the gates is close to square wave. 4) Someone saved my circuit before I fixed it it is the same, I was just renaming "Vs" do "Vd" because for MOSFETs it is Vd. It's the same supply voltage. Check here. 5) I would say around 10000uF/25V if your suply is not smoothed, less if it is (probably will work down to 1000uF or less with low-ESR caps) 6) breakdown voltage of 55-100 volts (lower is better) and current rating of ~50A or more, they are pretty cheap.
Registered Member #1940
Joined: Tue Jan 27 2009, 02:34PM
Location: Netherlands
Posts: 34
Ok, I’m a noob A colleague explained to mo how zenerdiodes work. After that explanation I draw this circuit. I think this is what you are trying to tell me.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Put two of them in series "back to back", because the signal from the GDT is symmetric. The way you drew it, it would short the negative signal and damage the driver.
Registered Member #1940
Joined: Tue Jan 27 2009, 02:34PM
Location: Netherlands
Posts: 34
Ok. That sounds logical to me. Back to back… I still don’t understand it. What is the “back†of a zenerdiode? I made another drawing. I have drawn two options. Which one is the one that you are trying to tell me? Is there a difference between them anyway (the way I placed the zenerdiodes).
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
You got it it doesn't matter which way you put them. Both are correct.
Edit: This circuit can become quite explosive if not set up and tuned properly. I'd say it's NOT a project for a beginner, and if you have any problems with the circuit, you probably will need an oscilloscope.
Registered Member #1940
Joined: Tue Jan 27 2009, 02:34PM
Location: Netherlands
Posts: 34
I’m going to buy an oscilloscope anyhow. It is very annoying if you can’t measure signals. Then you will never understand how it all works and whats going on.
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Questions about plasma speaker circuit
it is the same, I was just renaming "Vs" do "Vd" because for MOSFETs it is Vd. It's the same supply voltage. Check here. 
