> I'm pursuing an analog solution for my version - I've already got a 
> dirt cheap technique for high frequency ramp and comparitor that I 
> use in a couple of my other SMPS designs.  You could, of course, use 
> generate the control signal from a PIC by using low frequency PWM 
> and filtering that to near DC.

If you do the switching at the load end then you can post filter to 
DC. If you do the switching at the input prior to the transformer (as 
he was proposing) you need to filter the PWM but leave the resultant 
low frequency AC for the transformer to handle.


        RM. 

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