The Erica Synths EDU DIY Output Mixer 2 is a mixer for the upcoming EDU DIY Drum system and 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.

The Output Mixer 2 teaches the fundamentals of

• Op-amp summing and mixing
• Per-channel volume control and sends
• Send/return loop integration
• Diode soft-clipping distortion
• Headphone driver circuit design
• Line + headphone output stages

Built first on a breadboard for learning, then assembled into a complete Eurorack module using the included PCB and panel.

Mixing Fundamentals

• Op-amp summing
• Volume controls
• Per-channel sends
• Clean return path

Distortion Design

• Diode soft-clipping
• Variable distortion control

Headphone Driver Design

• DC blocking
• High-current output
• Driver stability

🎛 What the Finished Module Delivers

Once assembled into Eurorack format, you get
* 4 input channels with individual volume controls * Per-channel send controls + return control * Variable distortion insert effect * Line output + Headphone output

• 12 HP 35 mm deep

Distortion Mixer

What’s Included * All components for breadboard build * Eurorack panel + PCB * Power cable * 40+ page illustrated PDF manual (digital download) Required (not included): Breadboard, jumpers, and dual power supply (or two 9V batteries with clips).

Found Sound Australia Pty Ltd.
110 Albert St
Brunswick East, VIC 3057
Australia