LM386 Low Voltage Audio Power Amplifier IC (DIP-8)

Getting usable sound out of a small speaker normally requires an amplifier stage with real output current, and the LM386 packs that into a single chip that runs happily off battery voltages as low as a few volts with only a handful of external capacitors and resistors needed to complete the circuit. That simplicity has made it the standard choice for tiny battery-powered audio projects, intercom and walkie-talkie builds, simple guitar practice amps, and any project that just needs to turn a line-level audio signal into something audible through a small speaker without the complexity or power draw of a larger amplifier IC.