Power controller for regulating DC loads such as DC motors, incandescent lamps, heaters, and LEDs with series resistors. The PWM (Pulse Width Modulation) control used allows electric motors to start smoothly even at low speeds. The switching frequency is approximately 400 Hz (a humming noise may be audible with motors). Regulation is done via the included potentiometer or alternatively with an external control voltage of 0 to 5 V/DC.