Using 1N137 for Arduino MIDI In : r/synthdiy
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versatile DIY Midi connection boardPractical Usage
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Volca Sample MIDI Mapper using Arduino - Eunjae Im
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6n136 instead of 6n137 in MIDI circuit - DIY STUFF - Look Mum No Computer Thingies
DIY Midi Interface Arduino 6N138 Project & Kit 2021
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Arduino MIDI I/O Board / shaduzLABS
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