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Registered Member #1728
Joined: Wed Oct 01 2008, 07:52PM
Location: Italy (MI)
Posts: 13
Hi all! I have 12 doorknob ceramic capacitors for impulsive purposes:
Each are 20KV and 680pF (+/- 20%). I would like to use them in a marx generator, with a flyback transformer (driven by a zvs royer) as power supply. But i have no idea about the output high voltage of the flyback transformer (if >20KV or not) and i don't want to destroy my capacitors. What configuration might i use? Should be used two capacitors in series for each stage or i can use only one (and makes more stages)?
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Very nice caps . I have been wishing i had some like that, or some more of the 20kv 650pf caps i had. (i have only 4)
Using the royer circuit, with 12v in, should give you about 20kv. That is what it gave me. Then, if the spark gaps are set at 20kv, the voltage should not get any higher, even if the other gaps don't fire right away, because the cap would start discharging through the resistors into the spark gap.
For a good example of the voltages/spark lengths to look for, here is my video with a setup very similar to what you want. It is the same driver, a random LOPT, and 4 stages with some nice HV resistors from PFC capacitors.
Registered Member #1728
Joined: Wed Oct 01 2008, 07:52PM
Location: Italy (MI)
Posts: 13
Thanks Proud Mary for the correction .
Okay, so there are no risks to destroy them using a royer circuit. Arcstarter might you link here your video about your marx generator ? I'm curious to see your work and i want to take it as example.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
SimonTesla wrote ...
Thanks Proud Mary for the correction .
Okay, so there are no risks to destroy them using a royer circuit. Arcstarter might you link here your video about your marx generator ? I'm curious to see your work and i want to take it as example.
Crap, i watched my own video, but did not even link it! D'oh!
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
I had the exact same caps a couple years back and i built a 6 stage marx powered using a zvs. The caps are very robust, I was running about 3 to 4 bang per second and they never even got more than a little warm. I can tell you right now that it is going to be loud.
Registered Member #1728
Joined: Wed Oct 01 2008, 07:52PM
Location: Italy (MI)
Posts: 13
Nice video Arcstarter! How many long are the sparks? But in particular... where did you buy that HV resistors ? I think to use 3 normal resistors in series... but i don't think that it is the best choice! Electroholic, do you have a video about your marx generator?
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Doorknob capacitors for a Marx generator
. I have been wishing i had some like that, or some more of the 20kv 650pf caps i had. (i have only 4)
? I think to use 3 normal resistors in series... but i don't think that it is the best choice!