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Output mixer for Eurorack

Inspired by the mixer in the Erica Synths x mki.edu line (but with added channels and SMD components)

Panel

Features

  • Eurorack format (3U panel height = 133.4mm)
  • 8HP width (about 40mm)
  • 4 inputs with pan (L-R) and level adjustable
  • 2 outputs, line out and headphone out
  • Mostly SMD with a couple through hole parts

Issues

  • Pan is reversed
  • Not enough space for 1W 47R resistor
  • BD139/140 overheating

All addressed in current version (v1.1). The overheating was a result of poor quality BD139 and BD140 that I had sourced.

PCB front

PCB back