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




----- Original Message ----- From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 07, 2008 7:27 PM
Subject: Re: [TCML] 1,000uF 250V pulse cap needed


Chris Swinson wrote:
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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Hi Chris,

Check out DC Link type film capacitors. CDE has a couple of lines (947C and UNL series) that use metalized polypropylene film. These provide high capacity at moderate voltage and self-healing. Using a number of lower capacity units in parallel should allow you to meet just about any peak current requirement. See:

http://www.cde.com/catalogs/947C.pdf
http://www.cde.com/catalogs/UNL.pdf

With a bit more digging, you'll find there are other sources as well for film DC-Link caps, such as Epco:

http://www.epcos.com/inf/20/20/ds/b32674_8.pdf

Good luck,

Bert



Thanks Bert, will check those out!

Chris


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