> Thanks Bob, should work. Why pull down the pot input?

I am not sure what you mean.
Bob Ammerman

> Bob Ammerman wrote:
>
> > Step 1: use a voltage divider with a ratio of say 1:13 from the output
to
> > ground. This can be a relatively high impedance divider, say 120K from
+Vout
> > to the midpoint and 10K from the midpoint to ground. The max voltage on
the
> > midpoint of this divider is now 1/13 * Max Vout = 1/13 * 55V = 4.2 volts
> >
> > Step 2: set up an op-amp as a voltage follower to reduce the impedance
of
> > the output of the voltage divider.
> >
> > Step 3: now use the output of the op-amp as the input to a 50K digital
pot,
> > with a small resistor to ground.
> >
> > Step 4: the output of the digital pot is your voltage feedback signal.
> >
> > Bob Ammerman
> > RAm Systems
>
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