Re: X-ray film capacitors

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

Most likely polyester (aka Mylar) base for the film.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, May 06, 2001 11:24 AM
Subject: Re: X-ray film capacitors


> Original poster: "Christopher Boden by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <chrisboden-at-hotmail-dot-com>
>
> >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?
> >Thanks,
> >Jim Bultman in MI
>
> The Geek Group, has access to a LARGE amount of X-ray film sheets in the
> standard sizes. Both dental (long spools of about 5" wide) and regular,
> (about 12X18" or so...it's been a few years since I operated a process
> camera, lol).
>
> I'll ask around and get the exact compoud they're made from. I'll also put
a
> micrometer on a sheet. Anyone who wants to pursue this let me know, I'd be
> happy to scrounge a bunch of film.
>
> Remember, some films (I don't know if X-ray works this wa or not) contain
> Silver Halide as the photoreactive chemical. Last time I checked silver
was
> a rather good conductor. This could have catastrophic results in a
> capacitor.  But I don't know enough of the chemistry of X-ray photography
to
> really say. Anyone out there know?
>
> Chris "Your packet-switched-electro-lithographic" Boden
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