> Have a look some time... the pulse straddles the peak. As the
> current-pulse charges the capacitor, the output voltage rises to
> meet it, which crosses the peak unless there is *zero* source
> resistance in the circuit.

JT> Well, yeah, but it's only a little bit.

 No it's not... it's a short pulse. 

 It's easy to see in theory... draw a sinewave, then imagine the
diode charging the capacitor which then leaks until the next peak
arrives. The conduction starts *before* the peak, and continues until
*after* the peak, allowing for a small drop in the source resistance.

JT> A guy at work who's seriously into overclocking (I call them
JT> tight arses, but they insist it's not because of that). They
JT> pay stupid amounts of money on tightly specced power supplies,
JT> and they say those are PF corrected. I haven't had the chance
JT> to take one apart and see how they do it though. Would be
JT> interesting.

 The "PF" specs came in while I was working for Astec (Hong Kong),
and we were asked to have a look at it. So I did, and it was silly.
But we did it anyway...

Regards,
Bob


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