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DualMixer

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Dual 4-channel mixer

Based off a variety of simple opamp circuits, with the following design goals:

  • 4 inputs per mixer
  • Individual buffers for each input, to limit cross-talk between connected oscillators
  • As close to unity output when one input connected and fully opened (hence, output A can be connected to input B1 for a 7-channel mixer)
  • Peak LED for each output

Main board

Schematic

schematic

PCB

top

bottom

IO Board

Schematic

schematic

PCB

top

bottom

Face plate

faceplate

Simulation

Simulate this circuit on circuitjs

Notes for boards v1 (Obsolete)

The level pots go in the wrong direction. Fix: Mount I/O board the wrong way, and connect the unconnected top left pin of the dual header row to its right sibling(ground). This will reverse the A/B output LEDs, but that's fine.