If you design a 50-60 Hz sinusoidal generator and feed it to an op amp and 
then to a complementary symmetry pair and take the output from the common 
emitters, then, if you put the 120 VDC across the collectors (PNP to the 
minus side) you should get 120 VAC output between the collector of the PNP 
complement and the emitter junction.  I am sure that someone else will 
correct or add to this idea.  You should be sure to properly heat sink the 
output transistors because they will produce a lot of heat.


----- Original Message ----- 
From: "Cedric Chang" <cc@nope9.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, August 07, 2008 3:20 AM
Subject: Re: [EE] affordable full range 20+4 ATX power supply that may work 
on120V DC?


>> Or can anybody think of some tricks that may be applicable to make
>> any old
>> PS work on 120V DC?
>
> The PC power supplies I am playing with now, double the AC input
> voltage to 320VDC.
> They were very unhappy when I tried to run them at 160VDC.
>
> I think your cheapest solution is going to be obtaining a cheap
> converter.  a) 120VDC to 120VAC    or b)  120VDC to 320VDC
> The voltage regulation on solution b does not have to be very good.
>
> cc
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