This Module is currently available.
Voltage controlled polarizer / ring modulator
quadroPOL is a four-channel voltage controlled polarizer.
Its level potentiometers have a dead-zone in their center-position. Thus, it's easy to find the setting where the signal of is suppressed. Each channel works with a four-quadrant-multiplier which offers the possibility to use it as real ring-modulator.
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These merchants probably sell this module. Huh?