Re: More transformer data.

Until the advent of the latest monitors with switching regulator power supplies, monitors were either 100
volts (Japanese) or 110-125 volt (USA).

So, by definition, monitors used in Europe (240 volt, 50 Hz) would have to have transformers, if for no
other reason to get the voltage down to what the monitor was designed for.

(I've always wondered, is one side of the European power at a "ground" level? If so, do you also have 480
volt single phase power available for heavy power needs? Over here we have 460 and 480 volt power, but
it's mostly 3-phase.)

peter jones 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.
>
> ------------------------------------------------------------
> Name: OBV.zip
> OBV.zip Type: Zip Compressed Data (application/x-zip-compressed)
> Encoding: base64

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