This is a listing of free, open source, and public domain diy audio projects. These projects will contain at minimum schematics but most include gerber files for self production of PCB boards.
- Xmas TDA7293 amplifier –
Free/no license. Long thread on diyaudio.com. Gerbers, Schematic, and BOM. - Open Source LM3886 –
Free/no license. Long thread on diyaudio.com. Gerbers, Schematic/design files, BOM.
- RJM Sapphire –
Free for non-commerical use. Full discrete transistor current feedback amplifier. V4 BOM/deisgn files, V4 PCB files.
- Very Simple Phono Stage –
Free for non-commerical use. A simple, versatile phono stage for moving magnet or high output moving coil cartridges using a bare minimum number of parts. BOM/design files, PCB files.
- Open Source Protect -
Free/no license. Speaker DC protection board for power amplifiers. Gerbers, BOM
- Open Source LM3886 PSU –
Free/no license. Companion power supply for Open Source LM3886. Gerbers, Schematic. - Chipamp.com LM3886 PSU –
Public Domain. Power supply originally for sale on chipamp.com but now in the public domain for use. Schematic, Gerbers.