Electronic Speed Controler for R/C Models

Get an old servo where the servo amplifier still works. Cut off and remove the motor from the servo but leave some wire from one of the cables leading to the servo motor. Connect this cable to a 500 ohm resistor. Then connect that to the GATE (G in diagram) of the MOSFET. Find the negative wire of the servo which leads to the receiver, solder some wire onto it and connect that to the SOURCE (S) of the MOSFET and the negative port on the battery for the motor (note: this is not the battery for the receiver). Then connect the DRAIN (D) of the MOSFET to the negative port on the motor