Moduleur Build Guide

Build the Moduleur

The Shmøergh Moduleur is a fully analog, standalone synthesizer system you can build yourself — enclosure included. When you’re done, you don’t get a loose collection of modules. You get a playable instrument.

All circuits, PCBs, firmware, and mechanical designs are open source / open hardware.

Why build it?

It's a real instrument

A complete standalone synth at the end of the process.

Full enclosure design included

Not just electronics — panels, structure, mechanical files.

Standalone + Eurorack compatible

Build the entire system or just a single module for your rack.

UI and core PCBs are separated

Redesign the control surface if you want. Keep the analog core.

Hackable digital Brain

RP2040 (Pico / Pico 2) based. Open firmware. Extend it.

Fun

Large boards. Clear signal flow. Solid mechanics.

What’s inside

8 modules total

• VCO (x2): triangle, saw, square, sub, noise
• Mixer with sidechain compressor
• Diode ladder filter
• ADSR + VCA (x2)
• Utils: analog bit crusher, LFO, output interface with overdrive + headphones
• Brain: universal digital module based on Raspberry Pi Pico / Pico 2

The system follows standard Eurorack conventions

• ±12 V rails
• 10-pin power
• Reverse polarity protection
• 1 V/oct VCO tracking

Design priorities: robustness, component availability, clear signal flow.

Not a beginner project

You should be comfortable with:

• Reading schematics
• Ordering PCBs and sourcing BOMs
• Debugging analog circuits
• Working safely with ±12V systems

If this is your first build, start smaller.

The Files

All design files are available in the Moduleur GitHub repository:

• Schematics
• KiCad projects
• Gerbers
• BOMs
• Panel files
• Firmware
• Simulation files and test notes

Development is ongoing. Revisions may change between versions.

Build questions?

We have a Discord server where builders discuss debugging, substitutions, firmware tweaks, and custom panels.

If you’re building a Moduleur, you should be part of it.