Altoids Guitar Headphone Amp

This is my build of a common project, a headphone amp in an Altoids tin.  I made this for my cousin’s birthday, so he can practice while maintaining his parents’ sanity.

actual size!

Before/After

The tin has holes drilled for a volume knob, on/off switch, LED, headphone jack, and 1/4″ guitar jack.

The amp is powered by a 9V battery via a LM1086 5V regulator, and is based on a LM386 circuit found here.

An unbelievably bright blue LED turns on with the amp, so it doubles as a small flashlight or blinding device.

Inside the tin

Amplifier schematic

An approximate layout of the amplifier circuit

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