MATRIXSYNTH: New Befaco A*B+C Eurorack Module

Wednesday, March 01, 2017

New Befaco A*B+C Eurorack Module

A*B+C Features Published on Mar 1, 2017 Befacosynth

"This video outlines the features of our A*B+C module. The A*B+C is a dual channel 4-quandrant multiplier with DC offset. It has many uses including VCA, 4-channel mixer and for creating true Ring Modulation.

0:09 - Introduction
0:29 - VCA
1:12 - 4 Channel Mixer
1:41 - Ring Modulation

The A*B+C is available as a kit, PCB & Panel set, or as an assembled module from our store"


Each section can perform the analog multiplication of two signals (A and B) and add an offset (C). It can also act as a dual voltage controlled attenuverter, dual ring modulator, dual VCA or four channel mixer (see block diagram below).

The B inputs are routed to an attenuverter that multiplies the signal between -2 to 2, while the offset inputs (C) route through a unity gain attenuverter (multiplies the signal between -1 and 1).

B and C inputs are normalised to 5v and 10v respectively, so the A inputs can be processed using just the potentiometers.

The output of first block is normalized to the second one, so the second output can act as master to get (A1*B1+C1) + (A2*B2+C2)."

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