Available as an assembled Module and as a DIY project.
This Module is currently available.
3P2T bidirectional analogue switch
3-pole 2-throw bidirectional analogue switch.
Each COM jack is normally connected to its NC (normally closed) jack. When a voltage above approx. 0.5V is present on the SW input COM is connected instead to NO (normally open).
Each SW jack is normalled to the SW jack before it so one control signal can operate all three switches in tandem.
I initially looked into using solid state relays or dedicated switch ICs to achieve this design (would have been nice) but instead went with a cheaper discrete MOSFET switch circuit using parts I already had loads of.
Caveats:
It can cleanly switch eurorack signals at ±10V or more, although as the input signal/s approach the power rails they may be clipped at 10.5-11V or so, and 'off' legs of the switch may leak/be forced on.
You may observe a 'click' or switching artifact when using the COM jack as an output and a throw with nothing patched in is selected. If this bothers you try patching unused input to a source of 0V in your system, or use the common jack as in input instead.
The switches have an effective 'on' resistance of approx. 1kohm. This can be lowered at your own risk by replacing the 470R resistors with something much lower (10R?) or direct shorts.
6HP +12V: 10mA, -12V 3mA
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