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Dual / double midi out - schematic question — Parallax Forums

Dual / double midi out - schematic question

tuffstufftuffstuff Posts: 24
edited 2013-10-31 08:22 in Propeller 1
I am working on a tap tempo device that I want to have multiple midi outs. I could send duplicate signals on different pins, but I'd rather daisy chain them. Does anyone see any problems with the attached schematic? I don't know know enough about hardware to tell myself.

Thanks!

doubleMidiOut.jpg
doubleMidiOut.jpg
427 x 305 - 16K

Comments

  • average joeaverage joe Posts: 795
    edited 2013-10-30 22:59
    tuffstuff wrote: »
    I am working on a tap tempo device that I want to have multiple midi outs. I could send duplicate signals on different pins, but I'd rather daisy chain them. Does anyone see any problems with the attached schematic? I don't know know enough about hardware to tell myself.

    Thanks!

    doubleMidiOut.jpg


    I would recommend using 1 buffer per port. This is possibly overkill but will keep you in MIDI spec.
  • kwinnkwinn Posts: 8,697
    edited 2013-10-31 00:43
    average joe wrote: »
    I would recommend using 1 buffer per port. This is possibly overkill but will keep you in MIDI spec.

    +1. The chip may not be able to drive 2 ports properly.
  • davejamesdavejames Posts: 4,047
    edited 2013-10-31 06:27
    http://www.ti.com/lit/ds/symlink/sn7407.pdf

    *open collector output
    *IOH 250uA
    *IOL 40mA

    I'd go with a buffer per port as it would provide better isolation between ports should something go goofy.
  • tuffstufftuffstuff Posts: 24
    edited 2013-10-31 08:22
    Great, thanks for everyone's help! Seems like there is consensus here.
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