RE: [CAD_CAM_EDM_DRO] Re: Charging Capacitors

If the cap has a dead short, it will light at full brightness.

The resistence of the filament varies with temperature -- it gets higher
the hotter it gets. The lamp helps to limit total current draw. Also, as
the cap reforms, it will be able to pass more and more current; this
makes the bulb grow brighter for a given variac setting.

This is not only handy for forming caps, it is also handy for testing
any sort of analog electronics (audio or test equiment - no switching
power supplies). I have two electrical boxes, one with a duplex outlet
(with bananna jacks for measuring voltage), the other with the bulb and
a switch (plus a neon pilot light to show that current is being applied
to the unit). If I am testing an audio amplifier or such, I plug it
into this and plug the test box into the variac. Turn the amp on and
bring up the voltage. If the bulb starts glowing brightly, you have a
problem but don't pop a breaker.

Handy bit of test gear...

Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of oldpayphones
> Sent: Friday, June 02, 2006 9:19 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Charging Capacitors
>
>
> What is the light bulb for and how do you use it?
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Halliday" <dh@...>
> wrote:
> >
> > That would be best. Use a full-wave rectifier and a 25 watt
> lightbulb
> > between the rectifier and the cap.
> > Whole process should take a day or so.
> >
> > Dave
> >
> > > -----Original Message-----
> > > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Larry Olson
> > > Sent: Friday, June 02, 2006 12:31 PM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: RE: [CAD_CAM_EDM_DRO] Re: Charging Capacitors
> > >
> > >
> > > 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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> > http://groups.yahoo.com/group/jobshophomeshop I consider this to
> be a
> > sister site to the CCED group, as many of the same members are
> there,
> > for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
> THEM.
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> > bill
> > List Mom
> > List Owner
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> OFF Topic POSTS: General Machining
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http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there,
for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
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