The circuit receives MIDI data from a panel‑mounted MIDI IN jack, isolates it through a 6N138 optocoupler, conditions the signal using a 74HC14 Schmitt inverter, and distributes four identical copies to panel‑mounted THRU jacks. A 7805 linear regulator provides a stable 5 V supply for all logic components. The MatrixPortal, Arduino, Raspberry PI, or other logic board receives the same cleaned MIDI signal for lyric display or other processing.
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Integrated circuit fails
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