How to Build a Cool Laser Audio Transmitter from Scratch


Building a laser audio transmitter from scratch can be a fun and rewarding electronics project. With just a few basic components, you can send audio signals across open space using laser light. In this guide, I will walk you through the entire process of constructing your own laser audio transmitter, from gathering materials to final assembly and testing.

Required Materials and Tools

To build the laser audio transmitter, you will need the following:



Circuit Design

The laser audio transmitter has three main circuit sections:

Microphone Amplifier

This boosts the output of the electret microphone to line level signals suitable for transmitting. An op amp is configured as a non-inverting amplifier with adjustable gain.

Laser Diode Driver

This circuit takes the audio signal and modulates the laser diode. It provides the diode with regulated power while allowing audio signals to modulate the intensity.

Power Supply

A 9V battery will be regulated down to 5V and 3.3V to power the various components.


Follow these steps to build the laser transmitter:

1. Solder the amplifier circuit

2. Assemble the laser driver

3. Build the power supply

4. Connect all the circuit sections

5. Mount components in the enclosure

Testing and Use

To test and operate the laser audio transmitter:

And there you have it! With careful construction and testing, you now have your own hand-built laser audio transmitter for sending voice and music signals across open spaces. Have fun experimenting with this cool wireless audio project!