Abstract: This paper describes the design and construction of low power audio amplifier. In the construction of this amplifier, microphone preamplifier, tone preamplifier and output power amplifier. The output power amplifier is constructed by using class AB push pull amplifier. The input can come directly from the microphone or similar device and typical 4?/5W speakers are output. The signal output is clean with no distortion up to certain audio levels, but some distortion occurs at higher levels. The Multisim Software is used for the construction of audio amplifier.