The integrated output amplifier described in this article consists of little more than one integrated circuit. It is intended especially for use in motor vehicles and other batteryoperated applications. Although it appears simple and hardly worth looking at, the amplifier can produce an appreciable audio power output.Amplifiers come in all sorts. Most of the amplifier designs published in this magazine are intended for domestic or studio use. As such, they are usually powered by a 60–150 V supply, which may, moreover, be further divided into two balanced voltages. This makes these amplifiers unsuitable for use in motor vehicles.Amplifiers that can operate from a 12 V supply are quite different units, designed as they are for low-voltage supplies. If, moreover, they are required to provide a substantial power output, their design is far from simple.