Fw: caps

To: tesla-at-pupman-dot-com
Subject: Fw: caps
From: "Steve Young" <youngs-at-konnections-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sun, 28 May 2000 11:26:53 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

List,

I stand by my recommendation.  If you read carefully Mike's original
request, you see he is looking for filter caps for a DC power supply which
will run a Poulsen oscillator.  The latter is in effect an arc lamp with a
resonant circuit (TC secondary tank) which produces RF power because of the
negative resistance characteristics of the carbon arc.  He would NOT be
using the electrolytics in a tank circuit!

Electrolytics work fine for DC power supply filters.  Mike should add an
L-diode filter to keep the RF out of the electrolytics (Greg Leyh of huge TC
fame is an advocate of DC powered TCs using L-diode RF filters.)

Of course, Mike may prefer the more awe-inspiring oil filled HV filter caps
just because they look more impressive!
--Steve

----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, May 27, 2000 5:11 PM
Subject: Re: caps


> Original Poster: "Grayson B Dietrich" <electrofire-at-juno-dot-com>
>
> While I'm sure others will answer this as well, It is my understanding
> that  most electrolytic caps will burn out or worse (explode) if you run
> AC on them. Certainly they can not withstand the RF in a TC tank circuit!
>
> -Grayson Dietrich
>
> On Wed, 24 May 2000 07:23:14 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
> > Original Poster: "Steve Young" <youngs-at-konnections-dot-com>
> >
> > Mike,
> > Consider an electrolytic "MMC"!  Just string together 10 or more 400
> > volt
> > 150+ mF electrolytic caps with equalizing resistors across each of
> > them.
> > Can't beat the price.  HV electrolytics are available from many
> > surplus
> > houses such as All Electronics.
> > --Steve Young
> > ----- Original Message -----
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Tuesday, May 23, 2000 4:58 PM
> > Subject: caps
> >
> >
> > > Original Poster: "Mike Nolley" <nolleym-at-willamette.edu>
> > >
> > >     I have started building my DC powered Poulsen coil, and I am
> > looking
> > for
> > > filter caps.  I need 2 caps rated 4kv+ and 15 uf+.  If any coilers
> > on the
> > list
> > > have some caps matching these specs (or thereabouts) I'd gladly
> > pay for
> > them.
> > >                 --Mike
> > >
> > >
> > >
> >
> >
>
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