This project involved design and construction of an audio amplifier that could drive a quite number of speakers. This was achieved by coupling different stages of amplification together with a coupling element where the output of one stage serves as input to the next stage. The stages are, Pre-amplifier stage, Mixer Stage, Volume Control Stage, power output stage. This construction work resulted into an audio amplifier which can be used in Radio Receiver, Cassette Players, Video Players, Public Address System. An audio amplifier is a device for increasing the power of a signal (i.e. makes sound louder and signal level greater). It does this by taking power from the power supply and controlling the output to match the input signal shape but with large amplitude. A signal can be large in terms of it’s voltage level, current level or both, but in electronic system, a speaker requires several watts for good volume.