Re: 500 nf hv capacitor

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: DRIEBEN-at-midsouth.rr-dot-com 

Hi Pat, Anthony,

Anthony stated 500 nFD, not 500 pFD. I don't have the capacitance
formula or dielectric K table handy right now but I'm sure 80 sq
inches of 1/4" thick glass wouldn't even come anything near to 500
nFD of capacitance. 500 pFD I could definitely see, but not 500 nFD.
BTW, Anthony, did you actually mean 500 nFD, which is 0.5 uFD, or
did you in fact mean 500 pFD? 1000 pFD = 1 nFD and I would imagine
that a 500 nFD "homemade" glass-and-oil capacitor that could actual-
ly reliably handle 30 kV would literally weigh hundreds of pounds!

David Rieben

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
Date: Tuesday, April 6, 2004 12:46 pm
Subject: Re: 500 nf hv capacitor

 > Original poster: Pat Masterson <bat-at-grumman-dot-com>
 >
 > On Tue, 6 Apr 2004, Tesla list wrote:
 >
 > >Original poster: "Anthony" <ant17-at-optushome-dot-com.au>
 > >
 > >hi guys i was wondering if you could help me i want to build a
 > 30kvdc 500
 > >nf  capacitor i was wondering if any you tell me how i could go
 > about >making one
 > >
 >
 >  A classic glass plate capacitor might do well for you. A quarter
 > inchthick plate will withstand 60 KV and maybe 80 sqaure inches of
 > aluminumfoil would be needed. The exact parameters depend on the
 > dielectricconstant of the glass. -pat
 >
 >
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