RE: supplying power to a color vector monitor

        I think what you're describing would still isolate the secondary
from earth ground, which is exactly what an isolation transformer (or any
transformer for that matter) does -- the secondary(s) are floating with
respect to earth ground -- there is just "X" volts across the secondary
coil.

        I've never heard of an auto-transformer before. Basically,
it's a physical fact that any transformer that works by induction
(basically any transformer, or so I thought) has it's secondary floating
with respect to the primary -- put another way, because a transformer is
an AC device, there can be any DC offset present between the primary and
secondary and things still work. I'm not sure why any transformer would
have its primary and secondary windings connected together, but, like I
said, I've never heard of an auto-transformer before, so it's quite
possible that's what's happening there.

Joe

On Wed, 3 Jul 2002, John Robertson
wrote:

> Not all transformers are isolation. There are the step up/down transformers
> that one often sees in the Japanese and European video games to adjust the
> input voltage from 115 to either 100 or 220 VAC. So, it is quite possible
> to have a transformer in your junk drawer that is not isolation.
>
> John :-#)#
>
> At 09:00 AM 03/07/2002 -0400, James R. Twine wrote:
>
> > > From: Jon Raiford
> > >
> > > You didn't mention if these were isolation transformers and
> > > there was no link to check.. Neil, make sure you use an
> > > isolation transformer if you piece a replacement transformer
> > > together!!
> >
> > This may sound naïve, but I was under the impression that the term
> >"isolation transformer" simply meant a 1:1 transformer: a transformer
> >whose input voltage was the same as its output voltage.
> >
> > IIRC, the purpose of an isolation transformer is to *physically*
> >isolate the equipment from the power line, which all transformers do,
> >anyway: they work by inductance. So by using *any* transformer, you
> >would already get physical isolation...?
> >
> > Thoughts?
> >
> > Peace!
> >
> > > Jon
> >
> >[Get Check Favorites 1.4 Now! http://checkfavs.jrtwine.com]
> >-=- James R. Twine, MCP, (jtwine@jrtwine.com)
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> >
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Received on Wed Jul 3 10:18:12 2002