Blinds is a 4-channel voltage-controlled signal polarizer.
Each channel consists of a polarizer circuit, also known as a four-quadrant multiplier. This circuit acts like a VCA, except that a negative control voltage will cause the output signal to be inverted, instead of being silenced.
Blinds’ outputs are daisy-chained, allowing adjacent groups of 2, 3, or all 4 channels, to be mixed together. The price is for the blank PCB pictured only. Analog Classics does not provide support for this open-source project.