> You won't save any power by doing this... Using a linear component to
> drop voltage will just waste the power in the linear component.

Actually you will save a little power because the target circuit will draw
less current at the lower voltage.  However, a reasonable switcher will
still be more efficient.

> You could also build one yourself using a PIC. Its not too hard if you
> have an A/D and PWM output to spare.

You don't need a A/D, just a comparator.  If output voltage below
threshold do pulses as you can, if above voltage don't do pulses.  A
12F629 can with its built in comparator can do this job nicely.


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