Help! mic detection circuit.

Discussion in 'The Projects Forum' started by canodw, Apr 15, 2011.

  1. canodw

    Thread Starter New Member

    Mar 29, 2011
    25
    0
    Please help me about mic detection. Advice me on how to detect if the headphone consists of mic or do not have.

    Need help on how to implement this:
    My device has built-in speaker and built mic.
    1. When I insert the headphone with mic the built-in speaker & built-in mic shutdown.

    2. When I insert headphone (that has no mic) built-in speaker only shuts down and built-in mic is on.

    Please see the attached picture..Thank You very much all.
     
  2. Maged A. Mohamed

    Member

    Apr 6, 2011
    18
    1
    The plug for headphone only have the 3 and 4 parts one piece, so it will cause a short on mic pins when plugged in.
    You can sense this short and use a CMOS switch like 4066 or 4053 to connect the mic to be used
     
  3. canodw

    Thread Starter New Member

    Mar 29, 2011
    25
    0
    how it is done??? can u gave me a schematic..


    thanks
     
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