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Created February 09, 2013
Last modified February 10, 2013
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A circuit to supply complementary logic level from a single relay to control the Neo Instruments Ventilator.


Ventilator switch

I wanted to control my Neo Instruments Ventilator (Leslie speaker emulator) from a MIDI-controlled relay, but their implementation requires a two-pole switch. This circuit switches the tip and ring of a TRS plug in a complementary manner to satisfy the Ventilator.


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