> I'm don't understand your idea 100%, yet, but from what I see, wouldn't
that
> limit me to a regulation between 0 and +Vcc (ie: 5V)??

The amplifier circuit driving the final pass element is allowed to have some
voltage gain.  Think of it as a DC amplifier that may not be particularly
fast but can source a hefty current (and probably not sink any at all).  If
it has a gain of 5, then the output can be adjusted from 0 to 25 volts with
an input signal from 0 to 5 volts.  This in turn is easy to produce by low
pass filtering a digital PWM signal from a PIC.


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