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+--- Thread: Voltage controlled switch module (/showthread.php?tid=24348)
Voltage controlled switch module - SynthWizard - 05-26-2021
Voltage controlled switch module
for switching voltages outside of the supply range there is another clever trick which makes use of the virtual GND potential of an opamp.
https://electro-music.com/forum/viewtopic.php?p=449236#449236