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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
shady -
OK, I'll try to make it simple.
The Cornell-Dubilier 942C20P15K capacitor (.15uF at 2000v) has a peak current rating of over 430 amps. This capacitor is well-proven in spark-gap Tesla coil applications.
If you can find another brand or type of capacitor that incorporates polypropylene dielectric, is specifically designed for high-current pulse/snubber use, uses special "self-healing" construction, and has a peak current rating of several hundred amps, then you might consider using it.
Otherwise, you're wasting your time. Many, many people have tried to find a "cheaper" alternative to the C-D caps, but with limited success.
Given a conservative MMC design, the GE 42L series and the Arcotronics C4 series (both metallized film construction) have also been used, as well as the Atcotronics A72 series (film/foil). Various IGBT snubber capacitors also have voltage and peak current ratings that look good, but these are usually more expensive than the C-D 942C caps even if purchased as used surplus.
Registered Member #3597
Joined: Mon Jan 10 2011, 01:38PM
Location:
Posts: 19
Herr Zapp
thanQ a lot for ur help.I do appreciate that. the only prob. that i live in EGYPT and in our market they dont sell capacitors by serial no. but according to its capacity and voltage rating.So i cant go to an electronic component shop and ask him about Cornell-Dubilier 942C20P15K capacitor !! I can just say (do u have (.15uF at 2000v) cap. ) . add to that in Egypt almost no one is familiar with Tesla coil (i didnt meet anyone yet knows wat is TESLA COIL ) So i have no reference but this forum and you,thats why i am asking too many questions. any way i will go again to market and ask for another type of capacitors . I hope i can find a good type that time.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Shady -
Since you are apparently shopping on for capacitors on eBay, just keep looking for the Cornell-Dubilier 942 series caps. These are frequently listed by severel different edBay sellers under "MMC", "Tesla coil capacitors", "Cornell-Dubilier", etc.
Is it any easier to get capacitors shipped into Egypt from a private eBay seller in the US than it is to purchase C-D capacitors directly from a C-D distributor in the US or the UK? Richardson Electronics, Allied Electronics and DigiKey Electronics are currently showing stock of the 942C20P15K-F model.
(Incidentally, the "942C20P15K-F" designation is not a "serial number", it's a model number. There are dozens of different capacitor models in C-D's 942 series, with different voltage and capacitance ratings. The 942C20P15K-F is the model most frequently used in Tesla coil MMC construction.)
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MMC cap.
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