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Thread: MIDI OUT 3.5 TSR mini jack hardware protection

  1. #1
    Junior Member
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    MIDI OUT 3.5 TSR mini jack hardware protection

    I want to make a MIDI OUT Hardware connection for my teensy using 3.5 TSR (Tip, Ring, Sleeve) mini jack.
    My question is how to prevent short circuit that can be caused by the insertion of a 3.5 mono TS (Tip, Sleeve) mini jack.
    https://github.com/eTextile/Matrix/b...R_miniJack.png

  2. #2
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    Use a transistor to drive the output (tip) and use the 220 ohm resistors in the midi spec. It's designed to be robust.

  3. #3
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    Thanks fort that tip but it is not solving the issue I'm facing. When plugin a mono mini jack in the MIDI OUTPUT is short the VCC to the GND.

  4. #4
    Senior Member
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    Are you saying this IS a problem you ARE having? If so, then you have it wired wrong. The ring should NOT be connected to VCC it should be connected to VCC THROUGH a 220 ohm resistor. If you have the resistors properly installed, you will not have a short.

  5. #5
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    Here's a proper midi out port. Connecting a Teensy directly to a jack that might be miswired is a sure way to blow an expensive part. This entire circuit cost less than a buck.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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