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Plus2Minus

This circuit is for converting a positive-triggered contact in a pipe organ console to output a negative signal for MIDI encoding.

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In my 1953 United organ console, the Peterson electronic combination action requires that the stops, couplers, and pistons maintain a 12 volt DC positive trigger. The MIDI encoding electronics require a negative trigger. This circuit will convert the positive trigger to a negative trigger via ground. The quick switching and recovery time Toshiba TLP-222A photocouplers allow this interface to be ideal in a musical instrument.
  • 1 × J1 TE Connectivity 1-215079-6
  • 1 × J2 CONNFLY - DS1013-16SSIB1 (ZL231-16PG)
  • 8 × IC1 - IC8 Toshiba TLP222A-2 Photorelay
  • 16 × R1 - R16 UXCELL a14050500ux0866 1.5K Ohm, ¼ Watt Resistor

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