Design of Practical Low Frequency Power Amplifier

This paper briefly introduced the basic principle, contents and technical route of the power amplifier of low frequency signal. The entire circuit is divided four major parts: The part of the supply, preamplifier, power amplifier and wave-changing circuit. The structure of this circuit is simple and the price of components is cheap. results of experiments shows that the power amplifier have good performance in some aspects, such as bandwidth, distortion factor, efficiency, and so on. It will put forward a broad approach to design of power amplifier.