Triple Attenuator Mixer

A simple utility module that can be used as a 3 way mixer, or 3 separate attenuator, or one attenuator and a 2 way mixer. Eurorack

This is a simple 3 way mixer, with a passive attenuator for each of the three inputs, and a mix output with a main level potentiometer. Each input also has a dedicated output, when a jack is plugged into an output, the corresponding input is removed from the mix, and thus can be used as an independent passive attenuator. Hence this module can be used as a 3 voice mixer, or one passive attenuator and a two voice mixer, or three passive attenuators.

Specifications

  • 6HP wide
  • Eurorack standard compliant
  • Skiff friendly (2cm deep including power connector)

Build Instructions

The build is rather straightforward: just solder everything in its right place and you’re done!

Schematics and PCB Layout

See in download section to get the sources from GitHub

BOM

  • 7 Erthenvar jacks
  • 4 9mm pots (100k lin or log)
  • 5 100K resistors
  • 2 47K resistors
  • 1 330r resistor
  • 2 100n caps
  • 2 47pf caps
  • 1 tl072
  • 1 euro power header 2 * 5

Download the source from Github

The module on ModularGrid