Re[2]: More transformer data.

If you have a transformer that is listed as (for example) 36-0-36, then you
HAVE an isolation transformer. Unless the transformer specifically
identifies itself as an "Auto-Transformer" then it is an isolation style.

Look at the wiring diagram for the transformer in question. As long as the
output windings are not connected to the input it is isolation (most
transformers are isolation by the way). You can also do a resistance check
if you don't have the wiring for the transformer. If there is infinite
resistance between the line in and the output windings then this is an
isolated transformer. If the resistance is around 20 ohms, then you have an
auto-transformer.

The reason the discussion of isolation transformers comes up is that
standard raster (sorry) video games' monitors are NOT line-isolated, having
no transformer in the primary. They assume that the application provides
isolated power to the monitor.

Clear as mud??

John :-#)#

At 03:16 AM 11/30/00, Jon Raiford wrote:
>Although I don't need one right now, I've had the problem in the past
>where I've needed a power supply for a converted vector game. I've been
>pretty lucky in the past finding a power supply, but this may not always
>be possible. It would be nice to have a backup plan. The simple solution
>would be to just use a straight isolation transformer with a step down
>transformer behind it, but it would be nice to have a source of isolation
>transformers that step down the voltage themselves - just like the
>original ones.
>
>Jon
>
>At 06:22 PM 11/29/2000 +0300, you wrote:
>
> >-----Original Message-----
> >From: Jon Raiford <raiford@mindspring.com>
> >To: vectorlist@synthcom.com
> >Date: Wed, 29 Nov 2000 08:08:03 -0500
> >Subject: Re: VECTOR: More transformer data.
> >
> > > Speaking of transformers, how would one go about finding an isolation
> transformer that would work with the vector monitors? Like 50, 65, or 80
> VAC ct transformers? Or would you pretty much have to use a straight
> isolation transformer that feeds a second stepdown transformer?
> > >
> > > Jon
> > >
> > >
> ---------------------------------------------------------------------------
> >I cant remember exactly - but i think the monitor outputs on the atari
> 'tray' are isolated from the primary windings allready.
> >
> >try metering between the monitor feed and the mains input with
> everything dis-conected.
> >
> >L8r.
> >
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Received on Wed Nov 29 12:45:06 2000