Re: Charging Capacitors

I am not up to speed on variacs myself. Especially connecting a 220
one to 110. Now that I think about it some more and see some of the
other posts, I believe that he plugged the radios into the variac so
that the power supply in the radio converted the ac to dc at low
voltage and was brought up slowly. That way all of the capacitors in
the radio were formed at the same time. He was dealing with 50s & 60s
vintage Collins transmitters and receivers. I would think that a
variac connected to a bridge rectifier could provide the dc for the
cap at low voltages.

Russ

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Larry Olson" <larry@...> wrote:
>
> Or can I run the transformer on 110 (single leg and neutral)?
>
> -----Original Message-----
> From: Larry Olson
> Sent: Friday, June 02, 2006 12:11 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: Charging Capacitors
>
> I've got a 120VAC variac but my transformer is 220. Can I connect the
> variac to one of the mains legs and vary the voltage that way?
>
> Larry Olson
>
> -----Original Message-----
> From: Dave Halliday [mailto:dh@...]
> Sent: Friday, June 02, 2006 11:24 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: Charging Capacitors
>
> And don't use a wall-mount light dimmer, this is not a variable
> transformer, it passes the full 110VAC just chopped up.
>
> Wanliker's recomendation of a battery charger is a good one.
>
> Dave
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of rrrevels
> > Sent: Friday, June 02, 2006 10:04 AM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Charging Capacitors
> >
> >
> > A friend of mine rebuilds old amateur radios (tube type) and he says
> > he reforms the capacitors using a variac. He starts the voltage very
> > low and slowly brings it to normal over several hours.
> >
> > Hope this helps.
> >
> > Russ
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "oldpayphones"
> > <larry@> wrote:
> > >
> > > I have some used 200VDC 5400UF capacitors from a 1970's
> > Bridgeport that
> > > have been sitting for a couple of years and I was wondering
> > if there is
> > > a correct procedure for charging them initally. I have had
> > stereo PS
> > > caps explode after sitting for some time.
> > >
> > > Thanks,
> > > Larry Olson
> > >
> >
> >
> >
> >
> >
> >
> >
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