Feb 11, 2017
Precision Adder (for pitch CV’s)
High impedance inputs prevent pitch droop. Output = A + B + C*x. Inputs A and B are always at unity gain. Input C is at unity gain when its knob is at maximum, or it can scale the input down to zero. Input C is normalled to +5V, so it can add a variable offset without any other voltage sources.
My design, built on a Eurorack Stripboard, with panel by Front Panel Express. Module width is 3hp.
Inspired by the simple two input unity mixer on the Korg SQ-10, and by the Doepfer A-185-2 Precision CV Adder. Technical documents (schematic and layout) can be found here.