Originally Posted by neilcooper
I was wondering if it would be possible to make a circuit that would control a victor with a pot from full reverse to full forward? If possible using a 555 timer?
As promised, here is the circuit that produces variable width pulses (1 to 2 uSec) at about 60 Hz. This is fairly simple to build, components are not very critical, Radio Shack sells all of the parts. All of the resistors are 1/4 watt 10% or 5% tolerance, the capacitors 1 uF and above are electrolytic or tantalum, the small caps are ceramic monolithic (ar whatever is on hand).
I have included a way of converting some higher voltage (e.g. 12 volts) down to 5 volts using a 7805 regulator, along with the pinout of the Victor PWM signal inputs. Remember, black is ground and white (or yellow) is the PWM signal.
This will drive a Victor or any R/C servo from nearly full reverse to full forward, depending on the setting of the 1 k Ohm potentiometer. Note that there are some PWM motor controllers that do NOT use R/C type PWM inputs; this will not work with those.