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Thread: Shared ground between MIC and line-out ?

  1. #1
    Junior Member
    Join Date
    Dec 2022
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    Lyon (France)
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    Shared ground between MIC and line-out ?

    Hi !
    The Audio Adapter PCBdisplays a warning about NEVER connecting VGND and GND.

    But does it apply to line-out pins ?

    (I'm currently creating an Teensy-based audio guestbook with old phones and the wires between the main element of the phone and the handset contains only 3 cables, so if I want to avoid replacing the wire by a 4-cable one, it should be useful to be able to share grounds).

    If it is a bad idea to share grounds between line-out and MIC, please tell me.

    If it generates bad record quality, you can tell me too

    Thanks

  2. #2
    Junior Member
    Join Date
    Dec 2022
    Location
    Lyon (France)
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    17
    Self analysis : ground is shared between the GND near MIC, and the line-out GND

    But not between MIC's GND and the GND near VOL. So next step is to test recording and reading audio with shared ground

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