Electronics·Jan 5, 2018

Music Reactive Light

A simple desktop LED strip effect that changes brightness with the bass signal from a 3.5 mm audio line.

Overview

This project uses a TIP31 transistor as a simple audio-reactive LED driver. The LED strip can respond to the low-frequency content of music, while a three-way switch allows either sound-reactive lighting or steady illumination.

Specifications

RoleDesigner and builder

ModulesTIP31 transistorLED strip3.5 mm audio jackThree-way switch

Tech tagsTIP31LED StripAudio ReactiveDesktop Lighting

Schematics

TIP31 LED strip circuit — Audio-reactive LED driver circuit

Project photos

Music reactive light cover — Desktop LED strip effect

Music reactive light parts — Parts used in the build

LED strip mounted behind monitor — LED strip installation

Implementation details

Power

A shared power distributor lets the monitor supply feed both the display and the LED strip circuit.

Links & files

Original Instructables build