4-input mixer module for my DIY Modular synthesiser. Allows setting volume of each channel as well as the overall volume of the mix output.
It’s very much a boring utility module, but mixers are pretty essential in a modular synthesiser. This one uses a very typical opamp summing mixer circuit, with potentiometers setting each channel’s gain.
Given the simplicity I opted to fabricate the board myself at home.
- Schematic capture (EAGLE)
- PCB design (EAGLE)
- PCB cutting, etching, drilling
- Front panel design (Inkscape)
- Laser cutting at local makerspace
- PCB assembly
- Panel assembly
Designs can be found on GitHub: Mixer module