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The one thing I'm vague on is the "chopped up" phase of the PSU circuit you describe. Perhaps you can expand on that Volenti?
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Lets simplify more...
110@60hz in. Sinewave current
-Converted to ~150 DC and filtered by BIG caps to reduce ripple
-Re-converted to AC power via FET's with a switching rate much higher. 300hz? beats me. (Chopped up phase)
*newly formed high frequency power*]
-Into little transformers
-out to some more filter caps
-out to 5, gnd, 12, -5, 3.3, etc