Author Topic: Is this a pulse cap  (Read 279 times)

Offline 55#sofcopper

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Is this a pulse cap
« on: October 03, 2022, 07:36:49 PM »
Is this a pulse cap that's good to use for my tesla coil. I'm running 12000v at 300ma. It's a 6 in coil but considering upgrading to a 10 in secondary. My topload is 8in minor × 30in major. Super deal on this cap if it's what I'm told it is. Please need help identifying asap while I can still purchase. It says it 30kv and 80nf which is right in the ballpark of what I need
« Last Edit: October 03, 2022, 07:39:49 PM by 55#sofcopper »

Offline klugesmith

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Re: Is this a pulse cap
« Reply #1 on: October 03, 2022, 08:18:40 PM »
Let's wait for experienced coilers to reply.

I would guess that "pulse cap" is not a special requirement for coils.
Pulse caps are specified for infrequent discharges (not thousands per second), with details like ESL and peak current (often in kiloamperes) for some number of shots.
For Tesla coil use, I guess what matters is tolerable RF current (for billions of oscillations), dielectric loss, etc.
« Last Edit: October 03, 2022, 08:24:14 PM by klugesmith »

Offline MRMILSTAR

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Re: Is this a pulse cap
« Reply #2 on: October 03, 2022, 10:22:59 PM »
The more correct terminology is "energy discharge capacitor". I can't see what that specification label says. Its difficult to determine the internal construction just from external appearance. You need to see specs like maximum current, ESL, maximum PPS (pulses per second), lifetime shots, etc. Maxwell and and few others cite such specs on their energy discharge capacitors. Most energy discharge capacitors are only rated for 1 PPS or a little higher thus they would be unsuitable for SGTC duty. You need one rated for hundreds of PPS.

Even if this is an energy discharge capacitor, a 30 KV rating isn't high enough. Your 12 KV RMS transformer puts out a peak voltage of 17 KV. I would use a factor of at least 2.5 for the capacitor voltage rating if you want any measure of reliability. That would indicate a required voltage rating of about 40 KV.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline 55#sofcopper

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Re: Is this a pulse cap
« Reply #3 on: October 04, 2022, 04:39:00 PM »
Here is a better picture of the label. I can't find a datasheet on it. Any help would be appreciated. I need to make a move but if it's no good for my coil I don't want to spend the money. Right now I have a mmc of 942C20s47K-F at 32nf but they have been in use on several coils and they are really starting to show their age. And it's been a rough life they have had.

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Re: Is this a pulse cap
« Reply #3 on: October 04, 2022, 04:39:00 PM »

 


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