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  1. Glad you got it working. Played with a Shottky...

    Glad you got it working. Played with a Shottky bridge in front of the opto for receive and needed to drop the opto's series R from 220R to 200R to compensate for forward drop.

    With the bridge in...
  2. Looks good to me.

    Looks good to me.
  3. Ok, mockup completed. Along the way noted circuit...

    Ok, mockup completed. Along the way noted circuit post #12 shows R118 as 10K, should be 110R.

    23288

    Don't have any BAT54s so D21/22 are 1 Amp Shottky. R204 and Red Led serve as a visible...
  4. Just adding, in hindsight should have mentioned...

    Just adding, in hindsight should have mentioned in my first reply that 1/8" TRS Midi hardware is on the build bench and although I don't have gear with CV or Gate (yet), a colleague does so the...
  5. MC74HC1GT04DFT2 has HC family input thresholds so...

    MC74HC1GT04DFT2 has HC family input thresholds so probably won't work with +3.3v input signal. You need to look at 74HCTxxx family.

    74HCT04 is a hex inverter and its outputs can source or sink...
  6. How about using a 74HCTxxx for U5, U15 and U16 to...

    How about using a 74HCTxxx for U5, U15 and U16 to buffer and level shift to 5v and power protection circuits with +5v?

    Having said that, I think the forward drop of two BAT54s needs to be taken...
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