EDU DIY Output Mixer 2 (mixer for our upcoming EDU DIY Drum system) allows you to build and understand a 4-channel output mixer from scratch. On a breadboard, you’ll set up an inverting summing amp, add a send/return loop, diode distortion, and a headphone driver.
The manual uses clear diagrams and analogies to explain every step, and you can even assemble the kit into a full Eurorack module using the included PCB and panel.
Skill level: Intermediate. Basic electronics knowledge needed. If you’ve completed our VCO or previous Mixer kits, you’re set.
What you’ll learn
Mixing basics:
- Op-amp summing
- Volume controls
- Per-channel sends
- Clean return path
Distortion design:
- Diode soft-clipping
- Variable distortion
Headphone driver design:
- DC blocking
- High-current output
- Driver stability
What the finished module can do
Once assembled using the included PCB and panel, you’ll get a Eurorack Output Mixer module with:
- 4 input channels with per-channel volume controls
- Send/return loop with per-channel send controls and return control
- Variable distortion insert effect
- Line and Headphone outputs
What’s included
- All components for the breadboard build
- Eurorack panel + PCB for final assembly
- Power cable
- 40+ page illustrated PDF manual as digital download
You’ll also need: a breadboard, jumpers, dual supply (or two 9V batteries and clip connectors).
Want a smoother start? Labor is our purpose-built prototyping platform for our learning kits. It replaces the breadboard, jumpers, and power supply with a single intuitive workspace designed specifically for learning analog circuit design.
About the series
This kit is part of our mki x es.EDU Drums System lineup – a collaboration between Erica Synths and Moritz Klein to make analog drum machine design accessible, hands-on, and genuinely educational.
NB: This kit is designed as a self-guided learning tool. While we don’t offer individual support for failed builds, the manual includes a detailed troubleshooting section to help you diagnose and fix issues yourself – a crucial part of the learning experience.
