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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
At $8 a cap you can buy 950C or 942C or 943C caps from CDE.
EDIT: I just looked at the datasheet a little closer and they are indeed not suited for tesla coil operation. The peak current rating is only a couple of amps. Where most of the CDE 940C series are hundreds of amps.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Shady -
Absolutely not, those caps use a polyester (aka Mylar) dielectric that has a high loss factor at high frequency. They will quickly overheat and fail internally.
Common low-loss dielectrics include mica or polypropylene. For MMC use, film/foil capacitors using self-healing "hybrid" construction (film/foil/metallized film) have been proven to be the best choice for spark-gap Tesla coil use. If you can't find peak and RMS current ratings for the capacitor you are considering, forget it.
The most widely-used and well-proven MMC caps are the Cornell-Dubilier 942C series.
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MMC cap.
