Re: IIGS PSU question

[Stephen Shaw <xstephenx@apple2.org.za>]

On Wed, 02 Jan 2002 19:52:00 -0000, Scott Alfter wrote:

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> In article <3C31E245.7B2CA33D@home.com>,
> George Rentovich  <grent@home.com> wrote:
>>Scott Alfter wrote:
>>> In article <3C31D24E.4465300F@intergate.ca>,
>>> Wayne Stewart  <waynes@intergate.ca> wrote:
>>> >SharpShooter wrote:
>>> >> Hi,
>>> >>
>>> >> Is the IIGS power supply universal ?
>>> >> I mean "compatible" with both 110 and 220 voltages...
>>> >
>>> >I can't say about the power supply used in Europe but
>>> >the North American one is 110 volts only.
>>>
>>> The IIe power supply has a wire inside that you cut to switch it over from
>>> 120 to 240.  I would guess that the IIGS power supply is similar, but
having
>>> never owned one (mine's a "stealth GS"), I can't say for sure.
>>
>>  The switch, is not the only issue. You would need a transformer that would
>>have a dual  voltage input.

I have a IIe/II+ Astec circuit diagram (that is schematic to our American
cousins possibly our Canadian ones as well). If anyone wants me to scan it
please email me. Remove the x's from my email address.
PLEASE NOTE there are DANGEROUS voltages inside these power supplies. Try and
work with an isolation transformer supplying the power supply. Voltages on the
primary side are around 350 v DC. Now DC doesn't kick you off like AC i.e.
house
mains voltage. No, DC grips you tight and can shock you to death or cause an
irregular heartbeat leading to death. 

PLEASE BE CAREFUL. ONLY WORK WITH ONE HAND, KEEP THE OTHER IN YOUR POCKET IN
ORDER TO PREVENT A SHOCK PATH ACROSS YOUR HEART. IF YOU THINK I'M JOKING YOU
MAY NOT READ MY NEXT POST.
And I'd like you too :)

>
> Read my post again...the power-supply circuitry is already dual-voltage-
> capable.  You could wire a switch in where Apple put a jumper wire and flip
> it between 120 and 240.  (Besides, in a switching power supply, the
> transformer usually isn't necessarily responsible for converting the input
> voltage...it's way too small to handle the power supply's rated power
> output at 50/60 Hz.  I'm not 100% sure how the input voltage is handled,
> but if I had to guess, it would be something like this: When running on
> 120, the input section (some capacitors and diodes) could run as a voltage
> doubler; when running on 240, the input section could run as a full-wave
> rectifier/filter.  You would get the same output (about 340V, or maybe a
> bit less) in either case, which would then be cut down to the appropriate
> levels by the switching regulator and everything that follows it.)
>
>   _/_
>  / v \  Scott Alfter (salfter@salfter.dyndns.org)
> (IIGS(  http://salfter.dyndns.org
>  \_^_/  rm -rf /bin/laden
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-- 
With enough thrust pigs fly just fine!!!!!!!!!!!