mki x es.EDU Drum Mixer / Output Mixer 2 (kit)

EDU DIY Output Mixer 2 (mixer for the 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 (no breadboard)
• Eurorack panel + PCB for final assembly
• Power cable
• 40+ page illustrated PDF manual as digital download

You’ll also need, if you like to get the breadboard experience:

a breadboard, jumpers, dual supply (or two 9V batteries and clip connectors).

Erica Synths and Moritz Klein – have developed a series of educational DIY kits under the brand name mki x es.EDU with one specific goal in mind: to teach people with little-to-no prior experience how to design analog synthesizer circuits from scratch. What you’ll find in the box is not simply meant to be soldered together and then disappear in your rack. Instead, you are wanted to be taken through the circuit design process step by step, explaining every choice they’ve made and how it impacts the finished module.