Antichambre Posted November 11, 2018 Report Share Posted November 11, 2018 It's about 6N137 optocoupler as replacemant for 6N138 on MIDI8 and MIDI-IO Boards. Differences is that the 6N137 is a CMOS level output. More than that the 6N137 will allow you to significantly increase the speed between two MIDIbox. From datasheet maximum speed is 10 MBaud/s instead of 100KBaud/s for the 138. On the MIDI board you just have to remove the 4K7 resistor and replace 1K pull-up for a 10K. Done! Best regards Bruno 2 Quote Link to comment Share on other sites More sharing options...
Phatline Posted November 12, 2018 Report Share Posted November 12, 2018 thanks for that! Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted November 12, 2018 Report Share Posted November 12, 2018 yup, good info! very nice! Quote Link to comment Share on other sites More sharing options...
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