DC mixer module, 75x200 mm, with a five sliders and five jacks

The Analog Output DC Mixer is a DC coupled 3-input mixer, designed mainly for mixing control voltage signals. It is based loosely on the MFOS Quad DC mixer (but only one unit per module). A lot has been changed:

  • A general gain control was added. This turned out to necessitate significant changes to the original circuit.
  • Added antiparallel diodes and a pulldown resistor in the offset voltage divider, a la YuSynth mixer. This and the small value resistors makes the response to the offset knob knob S shaped, with a flat region around 0 V, reaching about ±10.2 V offset at extreme ends, making it easier to set small offset values.

Git repo