The actuators connect to the RFFS-100 receiver by two wires from each coil. The RFFS-100 is a 3 channel receiver with built in speed control good for up to 2 amps. If the actuators movement is reversed, simply swap the 2 actuator wires in their sockets in the receiver and its done. The tiny circuit board on the coil is a place to attach wires as well as a reference for orienting the actuator properly for mounting.

The picture shows the RFFS-100 with both actuator's wires plugged in with their 4 wires. The tiny crystal is to the left on the board. The black connector strip on the right feeds the motor from the center two holes and battery power is connected to the two outside holes. There is no switch. Get the polarity right every time- there is no protection for reversed polarity.

The actuators are mainly a coil with a magnet held in it's center The moveable magnet is driven by the coil's steerable magnetic field which is varied by the stick position for the rudder and elevator controls. Completely proportional. 3 channels, very long flights- for mere grams! The lightest and the slowest.

Also pictured is a new actuator with an output arm for driving a pushrod. These have larger coils, making them more powerful- and heavier. They are for mounting near the center of the fuse to keep the tail light- but require careful setup for magnetic non-interference with one another.