RE: Electric Retracts - Modifying existing Air/Servo-operated Retracts
You could make very simple electronics for this (I did). PIC10F with a Zetex current sensor (S0-23), two dual FETs (S0-363), cap and resistor (0603). No need for A/D, yet you can measure current using this setup. You will need a voltage regulator for PIC. You could build this entire thing for dual retracts in a space of .25" x .25" if you needed to. In my case, I mounted the board directly to the motor's power wire tabs. This eliminates wires going to the motor. The PWM input is handled by the PIC so you just have a board with a servo plug. You use Y-cables to connect all the gear together to a single channel.