LM386 Low-Voltage Audio Power Amplifier

A small audio amplifier that drives a speaker directly from a low voltage supply with very few external components - a handful of capacitors and it works. Gain is 20 by default and can be raised to 200 by adding a single capacitor between two pins. The standard chip for adding sound to a project: intercoms, small radios, audio alerts and battery-powered speakers. Drives a speaker directly with minimal external parts; Gain adjustable from 20 to 200 with one capacitor; Runs from as little as 4V, suits battery projects; Low quiescent current when idle