This CV Mixer system is an adaptation of Ray Wilson’s design found in his Multi-Function module from the essential MFOS website. I wanted to make a modular design with minimal wiring. All pots are soldered to the PCB whilst the sockets connect to a 5 pin single row IDC. This way you can use ‘each side’ of a 10 pin IDC to connect 2 mixers at a time to your socket panel. I made a socket panel which has 2 x 10 pin IDC connectors so 4 mixers can be connected. Built into my socket panel is a Common Input which buffers this signal each of the 4 CV 1 inputs. Inserting a plug into a CV1 input socket breaks the buffered signal.
This system I built for my 4x HMVCO1a so I have wired each mixer output to its corresponding oscillator via the ‘normalled’ pin each CV input socket.
Each CV Mixer gives you :
A coarse voltage bias
A fine voltage bias
3x CV inputs with attenuators
A bi-polar LED indicator showing polarity of voltage