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Registered Member #2470
Joined: Tue Nov 17 2009, 05:47AM
Location: Simi Valley, CA
Posts: 43
Hey Guys, I have two 15kv 60mA transformers that i'm running in parallel. I was planning on a bank of 32 Cornell Dublier 942C20P15K-F 8 per string, 4 strings. giving me 16kV and .075 uF. I only need .0553 uF though. Do you guys think it would be better to do 10 per string and 4 strings? That would give me 20kV and .06 uF. I guess my real question here is what are the real limits as to how close the actual capacitor specifications are to the calculated specs. I am leaning towards doing the 10 x 4 array. (The 9 x 4 array seems illogical, because for only 12 dollars more why not make it a bit better) Specs on the 9 x 4 were .0666 uF 18kV. I would greatly appreciate your opinions as this is my first ever tesla coil and i dont want to have to make 10 capacitor orders, lol. Sorry if i was a retarded writer, its real late here. Thanks, William
Registered Member #2470
Joined: Tue Nov 17 2009, 05:47AM
Location: Simi Valley, CA
Posts: 43
Any ideas guys? Its a pretty simple question. Do you lose performance if your actual capacitance is greater than your calculated capacitance? I think that on a 15kV xformer, a 20kV cap bank will suffice (im not an expert, though).
Registered Member #2298
Joined: Sat Aug 15 2009, 08:16PM
Location: ex UK, now Santa Cruz, CA
Posts: 35
The voltage rating is fine. The capacitance should also be fine, of course you would need fewer primary turns than you would have with the lower value of capacitance (or a larger topload). That could have indirect effects on performance through greater gap losses. I wouldn't lose too much sleep over it. After it's built you can always try bypassing some capacitors to lower the overall value.
Registered Member #2298
Joined: Sat Aug 15 2009, 08:16PM
Location: ex UK, now Santa Cruz, CA
Posts: 35
The 942 series are very nice capacitors, extremely robust and with self-healing properties. People have run them successfully at more than twice the voltage stress you will be putting on them.
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Capacitor Question
