Re: capacitor identification

• To: tesla-at-pupman-dot-com
• Subject: Re: capacitor identification
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 23 May 1999 22:11:29 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: Bert Hickman <bert.hickman-at-aquila-dot-com>
> 
> Tesla List wrote:
> >
> > Original Poster: "Kevin Wahila" <knw2-at-lehigh.edu>
> >
> > about a year ago i picked up a capacitor at a ham fest and was wondering
> > what type of information, if any, i could get on it, specifically the
> > voltage rating.  i measured it to .0021 microfarads.  that's about all i
> > know.on the top are the two screw terminals and the words SANGAMO, then
> > MICA CONDENSER.  it's 2 1/8 inch deep by 2 1/3 inches wide by 2 3/4 inches
> > high.  that's about it.  my main questions are what might be a possible
> > voltage rating, what was it once used for and what might it be used for
now.
> >
> > thanks all
> > kevin wahila
> 
> Hi Kevin!
> 
> This is a "classic" mica capacitor. Based upon the physical size and
> capacitance the voltage rating is probably between 8,000 and 12,500
> volts peak. This would make an excellent tank capacitor for a
> vacuum-tube driven Tesla coil!
> 
> -- Bert --

	That voltage rating sounds high to me - I think that about 5000 VDC
would be closer.  I'd really examine the thing to see if there weren't a
working voltage rating on it somewhere.  Such capacitors are ncommonly
rated for DC working voltage, and RMS current at several different
frequencies, which in effect determines the allowable voltage.

Ed

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