LM386 is a low power voltage amplifier IC by National Semiconductors. Specifically designed for low power applications, it provides an internal gain of 20 which [[wysiwyg_imageupload::]]can be easily shoot to 200 using a resistor. This IC has been developed for battery operations and is widely used in circuits such as intercoms, audio systems in televisions, power connectors etc.The circuit described here is based on LM386 which amplifies sound input so that they can suffice enough for interiors of a car or a mobile phone. Fairly compatible, this circuit is widely used commercially. Read on more to find out how the circuit is made and how it works.