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 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.
In the circuit described is based on LM386 and amplifies sound input so that they can suffice enough for interiors of a car or a mobile phone.
To understand the working of project, one should first understand its pin description-
Fig. 1: Pin Diagram Of LM386
Filed Under: Electronic Projects