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X-ray film capacitors

Original poster: "Fred Bultman by way of Terry Fritz <twftesla-at-uswest-dot-net>" <royaloakmin-at-home-dot-com>

Hi all
With some of the recent discussion of home made capacitors, I decided to try to
make my own. I used a 4x10 sheet of Kodak dental x-ray film, with a sheet of Al
foil on each side. I tested it up to 15 kvac, and the discharge was very hot
and loud. My only concern was what material the film is made out of. Could it
be lossy at RF like Mylar? How many sheets would I need for 30nf? 
Jim Bultman in MI