II-2. MIDI Electrical Standard

A MIDI in interface uses an
opto-isolated current loop.
5 Volts flows through a
total of 660 Ohms (min.)
of resistance. There is
a protection diode in
case someone wires up
somethingbackward. MIDI
is just a buffer and
some resistors. MIDI thru is
a buffered pass-through of
the MIDI in signal.

More Information on Building MIDI Interfaces

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