Printed circuits caps

• To: tesla-at-pupman-dot-com
• Subject: Printed circuits caps
• From: "Steve Cook" <Steve-at-g8cyerichmond.freeserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 25 Sep 1999 13:09:37 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

has anyone thought of using printed circuit board for making pulse caps? I
recently came across some surplus double sided G10 board. My data books give
the dielectric constant as 4.5, and the electrical strength as 15kV/mil.
I/ve made a small one (0.0005mfd). I ran it at 15kV for an hour, no
noticeable heating and no break down. The copper was removed for about 1/2"
all round the edge. I ran a bead of hot glue over the edge of the copper.
Capacity works out at 16pF per sq in. That means that a piece with plates
6.25x10" will give 1nF!!

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