A friend in Taos has a need for controlling these little RC servos and much larger hydraulic servo valves so I threw together this little test rig. Driving RC servos is pretty straight forward. Just get the timing down and work on appropriate pulse lengths. The display + scope + wireless + jtag make debugging easy.

This is a part of a dual channel hydraulic servo card showing the servo valve drive circuit. This circuit can be jumpered for 20/40 or 100ma full scale.