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Re: [TCML] 1,000uF 250V pulse cap needed



Gary,

It is for a tank cap, though is a solid state design so only low voltage needed. They must be able to pulse at least 300amps, though this also relates to about 12A/uS at least also. It is not much of a goal, though looking though digikey's pulse caps, most do not list the figures I am looking for. Some list like 20V/uS and 4amp pulses, though its not very helpful.

A good cap would 250VDC , 100A/uS , 100V/uS. I probably won't be running more than 100V, though the extra headroom is always good.

I suppose it would help if they were screw terminals. The problem I have now is 200 caps all in parallel and unsoldering them all to find the duff one is not an easy task :-( Though I guess I will be stuck with solder types again. A much higher value like 10uF sounds a lot better

4.7uF 212 caps is what I have now! (1,000uf) 10uF 100 caps, somehow think 50uF is a better choice but not many caps that size. Also trying to keep cost low too, its why I brought 4.7uF's as they were cheap, though in doing that its complicated the repair on the thing. So can't really "win" :-(

Chris




----- Original Message ----- From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 07, 2008 6:25 PM
Subject: RE: [TCML] 1,000uF 250V pulse cap needed


250V seems like an unusually low voltage for a pulse cap, so it's unclear what application you have in mind, and exactly what the component requirements are. Just saying that they need to "withstand pulses" is pretty vague. How high is "up"?

Regards, Gary Lau
MA, USA

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Chris Swinson
Sent: Thursday, August 07, 2008 1:14 PM
To: Tesla Coil Mailing List
Subject: [TCML] 1,000uF 250V pulse cap needed

Hi all,

My array of 470nF caps seems to have died. Had these all in parallel and
going to be near impossible to separate them.

So does anyone know anywhere to obtain any higher value caps than 470nF at
250VDC ? I need to make up to 1,000uF. The caps I am using are cheap ones
form rapid, though seem to be really crap anyway. So as I am going to have
to dismantle and rebuild, then wonder if there is a low cost source of caps
that I can just replace the entire bank with. These have to be able to
withstand pulses so unfortunately I don't think electrolytic are up to the
job.

cheers,
Chris

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