Karl Townsend wrote:

What you suggest would work if the pot is a two-terminal variable
resistance. If it is a three-terminal voltage divider you need to
understand and describe the possible CNC outputs and pot circuit more
thoroughly.

Ya, see your point. Its three treminal. To do this, I'd have to double the
complexity and have resistors above and below the wiper. Pot turner looks
better now.


Karl there are dc powered, motorized pots made by Alps and others for
remote volume controls. but you could use a R/C servo motor to turn the
pot, and a 555 timer IC to generate the PWM control signals. This was
common on the old C-band feed horns to select the polarity, and trim the
alignment as you changed channels.


--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'