Abstract: This invention relates to a speed control circuit for an electric motor. It includes a controller having a plurality of input circuits and an output circuit adapted to be connected to one of a plurality of direct current motors. The controller includes means responsive to an alternating signal on a selected one of said input circuits for generating and maintaining a unidirectional motor-energizing voltage of predetermined magnitude in the output circuit whereby the speed of said one motor may be controlled. The controller further includes Hall cell devices coupled to a plurality of motors, respectively, for generating the alternating signal in response to energization of a selected motor.