> How much modulation (in terms of output voltage) do you need?
>=20
> Could you use digital pot, e.g. AD5290, with existing pot in series?

Ah, sorry. Missed that detail. Adjustable modulation. That would be
from min (1.25V) to any voltage up to and including max (32.5V), so
the pot would have to be out of circuit or paralleled

Joe
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.