Building an Audio Amplifier

A general purpose audio amplifier is very handy in many projects that are related to audio. This project, which can be completed within a few hours, is a more advanced version of the simple LM386 based amplifiers projects normally found as provides a safe connection to external devices (e.g., smartphones, PCs etc.) and provides a x200 gain which allows you to connect weak audio sources (like headset sockets) to speakers. The circuit is based on the LM386 IC (see specs) and supports a single channel (mono).”

Link