Abstract: Apparatus is disclosed for controlling the duty ratio of the application of an energization source such as a battery to a load in the form of a motor for driving a vehicle. More particularly, there is disclosed a motor control implemented by solid state devices and more specifically, SCR elements. The apparatus employs a first oscillator circuit for providing a first train of timing pulses, the frequency of which is determined by the position of an operator manipulatable member, e.g. a vehicle accelerator pedal. The first train of pulses is applied to fire a main SCR. Further, there is provided a second oscillator circuit for providing a second train of pulses for controlling the discharging or dumping of the charge stored upon a commutating capacitor across the main SCR, thereby deactuating or commutating the main SCR.