"a" computer.  They make 12VDC ATX supplies....for about $50.  For a one-off design pretty much a no brainer unless you just like to experiment.  Rather ineffecient to convert the 12VDC to 220VAC and then convert back to 12VDC/5VDC/3.3VDC as well.
   
  

Yigit Turgut <y.turgut@gmail.com> wrote:
  Adam,thanx for the reply.

The load is a computer.And I need modified sine wave @ 50hz.

If I can once get into AC,then I know what to do.But I don't know how
to set the frequency.

How can I push 20 amps ? Although I need 5-6 amps.
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