Description

The MIDI8d is a 4HP wide, simple and versatile Eurorack module that can output 8 digital gate or clock signals from a single MIDI TRS input connection.

If you also need analog CV outputs, have a look at the MIDI8d+.

Firmware

The core of the MIDI8d is a classic Arduino Nano (ATmega328p), programmable with the free Arduino IDE. Different firmware sketches can be uploaded to adapt or completely change the module’s behaviour.

Firmwares are cross-compatible between MIDI8d and MIDI8d+.

Typical uses:

• 8 drum trigger outputs, reacting to MIDI Channel 10 (notes 36 to 43)
• MIDI Clock with various time divisions and Start/Stop Gate outputs
• MIDI channel activity monitor
• … and many more: write your own!

Open source firmware repository: https://github.com/dhaillant/midi8d/

Hardware

The module consists of two PCBs:

• the Front PCB, supporting all jack connectors and LEDs
• the Rear PCB, supporting the Arduino Nano and the Eurorack power input

The MIDI input jack is a stereo TRS Type A connector (Tip = Sink, Ring = Source). The MIDI input circuit is built around the high-speed optocoupler 6N137.

Components are pre-assembled SMD, the only remaining components to solder are classic Through Hole parts, making the build very accessible.

Orders are usually shipped within the week following purchase.

Smaller items (PCBs, assembled PCBs, and small kits) are sent in letter format (padded envelope), while larger items are sent as parcels.

Shipments within France and the EU are only tracked when sent as parcels.

Shipping to the rest of the world is available. Please contact me if you have any questions or concerns.