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6N138 Optocouplers: Features, Pinout, and Datasheet
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6N138-COMP-IC-6N138

MIDI In works on Uno, but not Nano? - Audio - Arduino Forum

serial - How do I properly receive MIDI with Arduino, with 6n138

versatile DIY Midi connection boardPractical Usage

PedalinoMini 3V3 with 6N138 and BSS138 (MIDI OUT pin4/5 now OK) - OSHWLab

Nulleffekt

STM32 based MIDI synth - Ronox's Blog

Notes and Volts: Fun with Arduino - Midi Input Basics