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Re: Glass Capacitor



I tried glass caps for a while a few years back, and gave up for the
following reasons:-
1- weight
2- fragility
3- lack of dielectric strength
4- glass is too lossy
5- cost, an MMC isn't actually that much more expensive initially if you
shop around and it doesn't have the above problems.
Steve
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, March 23, 2000 4:41 AM
Subject: Re: Glass Capacitor


> Original Poster: "Ed Phillips" <evp-at-pacbell-dot-net>
>
> Tesla List wrote:
> >
> > Original Poster: "Scott Stephens" <Scott2-at-Mediaone-dot-net>
> >
> > Who has used plate glass for their capacitor, what specs and what
results? I
> > remember someone complaining a while back it was very heavy. I'm
considering
> > stacked plates with aluminum foil in between:
> > 10" x 10" with 1/4" on the edges painted with corona dope
> > .05" or .1" thick plate glass for 12KV?
> >
> > Thanks,
> >
> > Scott
>
> Used glass plate capacitors made from double-strength window glass when
> I was a kid, and always punctured the glass before much running.  That
> was with a 6 kV, 30 ma (?) NST.  Maybe they could be made to work if you
> used thick enough glass and got them well enough oil-impregnated to
> prevent corona, but I suggest saving your pennies until you can do
> something better, such as buy commercial units.  Doesn't seem sporting
> not to make them, but the results will probably be much more
> satisfactory.  For home-built HV capacitors made with commercial
> components, the MMC's sure sound interesting, but have yet to try the
> idea here.  Most assuredly will.
>
> Ed
>
>
>