A clamper is an electronic circuit that shifts the entire signal up or down to fix either the positive or negative peaks of the signal to a defined level, without restricting the peak-to-peak excursion. It does this by adjusting the DC value of the signal. A voltage multiplier is an electrical circuit that converts AC power to higher DC voltage using capacitors and diodes, and can generate voltages from a few volts to millions of volts. A light-emitting diode (LED) is a semiconductor that emits light when activated by applying a suitable voltage, with the color determined by its band gap.