SERVO TEST-JIG I needed to test some RC (radio-control) "analogue" servo motors. As used in model boats, cars, aeroplanes etc The circuit shown will achieve same. There is a 3 connection input wiring. Centre is ground, red wire is + 4.5 volt (I use +5V) other remaining wire is a PWM (pulse width modulated) control signal. From info' on the web it seems these servos respond to a pulse input of about 0.5 to 2.5 millisecond at a 30 to 50Hz rate. See diagram for further details So far all the servo's test out OK