Karl Townsend wrote:

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.

I'm terrible at circuit board work and useless at EE design, but I can have
kits done.
How about this one? My control can output 0-10 volt for analog control.
http://www.kitsrus.com/pdf/k102.pdf

And then get a servo motor.

Karl


It looks like it should work for you. That kit will handle up to
four servos, too. You would want it well shielded when using around
your welder or plasma cutter. If you do use it, ground the unused
inputs, and put a 1K resistor from each unused output to ground.


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