Abstract: A voltage-adder circuit, which adds the charge stored on a capacitor during a switch off-time, to the voltage of the input battery/power-supply, to provide an output voltage greater than the input voltage. The circuit is especially well-suited for use as an LED driver, and may be also used as a voltage booster for low-voltage electronic circuitry, such as electronic watches; as a back-bias generator for use inside integrated circuits; and, as a gate-bias-voltage generator, for use with depletion-mode GaAsFETs, such as are used in the transmitters of cellular telephones. The circuit obtains high efficiency operation by the use of inductors to charge a storage capacitor. Switches may be added. The invention includes a novel self-operating switch.