RE: [TCML] Chinese made polystyrene caps

["Lau, Gary" <Gary.Lau@xxxxxx>]

Hi Dave,

My thoughts mirror yours - too small to be capable of what we require.  Even the stated application looks dodgy:  "Electronic filtering in DC impulse Circuit Voltage Multiplier in DC impulse Circuit etc."

I think it's probable that a suitable Chinese-made replacement for CDE942 can't be too far off, but this isn't it.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of David Rieben
> Sent: Tuesday, May 12, 2009 8:48 AM
> To: Tesla Coil Mailing List
> Subject: [TCML] Chinese made polystyrene caps
> 
> Hey guys,
> 
> I was just wondering if anyone has any experience
> with these Chinese made capacitor types that are
> absolutely flooding eBay these days:
> 
> http://cgi.ebay.com/30kV-0-2-F-High-Voltage-Polystyrene-capacitor-HAM-
> audio_W0QQitemZ360120565659QQcmdZViewItemQQptZLH_DefaultDomain_0?
> hash=item53d8dbbf9b&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A1%7
> C293%3A6%7C294%3A30
> 
> My guess is that since this particular one is only
> 80 mm x 120 mm long or appr. 3 1/8" x 6" long,
> and yet it has a very significant energy capacity (90 J),
> there is no way that its internal construction could
> render it competant to withstand the high RMS cur-
> rents and tremendous peak currents encountered
> in larger SG driven Tesla coil circuits, even though
> polystyrene is a good, low loss dielectric. Likely of
> very fragile metallized film construction. What are
> your thoughts?
> 
> David Rieben
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