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

[Bert Hickman]

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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> Tesla at www.pupman.com
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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
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