Simple MIDI interface tester

  
Sometimes when experimenting with different soundcards and MIDI interfaces it is useful to see if there is some data going in MIDI interface. This can be easily tested with this adapter, which converts the midi signals to visible light pulses. Just the circuit and plug it to the MIDI output of your computer. When computer sends any midi data out, you see the LED flashing. I found this tester very useful in testing homebuilt soundcard MIDI interface.
Simple MIDI interface tester - schematic




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