A switching amplifier or class-D amplifier is a electronic amplifier which, in contrast to the active resistance use in linear mode AB-class amplifiers, uses switching mode of transistor to regulate power delivery. The amplifier, therefore, features the high power efficiency (low energy losses), which additionally results in lower weight by eliminating the bulky heat sinks. Additionally, if voltage conversion is necessary, the on-the-way high switching frequency allows the the bulky audio transformers to be replaced by small inductors. Low pass LC-filtering smoothes the pulses out and restores the signal shape on the load.