Re[3]: More transformer data.

Isolated or not, you can still receive a shock from an ungrounded game if
it is malfunctioning (bare wire contacting chassis, shorted component that
is mechanically attached to chassis, etc.)

Taking a quick peek at the Lunar Lander schematic I see an isolated input
to the monitor, with the only two components receiving non-isolated
supplies being the interlocks and the marquee lamp.

         - Matt

At 10:52 PM 11/30/00 +0300, you wrote:

>-----Original Message-----
>From: John Robertson <jrr@flippers.com>
>To: vectorlist@synthcom.com, vectorlist@synthcom.com
>Date: Wed, 29 Nov 2000 09:01:45 +1100
>Subject: Re[2]: VECTOR: 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 :-#)#
> >
>That sounds pretty fucked-up!
>I am in europe, and we ALLWAYS use isolation transformers on the monitors.
>If we didn't then we could get prosecuted for endangering public safety.
>
>I was not aware that in america people where stupid enough to just connect
>monitors to the power-line.
>I suppose that is why american manuals make so much of a point about
>correct grounding of the machine!
>
>L8r.
>

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Received on Thu Nov 30 16:21:11 2000