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That circuit is horribly wrong: The connections to pins 4 and 5 of the MIDI connector are exchanged (and that connector is labelled wrong). RB must be 220 Ω. The CNY17 optocoupler is often too slow; use a H11L1, or better a 6N137. RD is too large unless you're using a really fast optocoupler. But when you're using a correct circuit (see, for example, ...

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