THE PACKAGE IS DERIVED FROM THE ORIGINAL GAMESS CODE DUE TO M

A voltage control circuit for a motor, such as a vehicle motor, energized from a battery. The circuit utilizes a commutating capacitor and a main pass SCR, and includes a separate capacitor charging circuit which always charges the capacitor to twice the unloaded battery voltage, the capacitor being charged whether or not the main pass SCR is on. The circuit operates at a fixed pulse frequency and has a manually operable potentiometer which controls the pulse width, whereby the effective DC voltage output to the motor is correspondingly controlled.