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  1.    #1  
    Hello All,

    Any one know the headset(4 pole) pinout for the 650?

    2.5mm 4 conductor plug

    Contact 1 (tip)- ?????
    Contact 2 - ?????
    Contact 3 - ?????
    Contact 4 (base) - ?????
  2. leonidm's Avatar
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    #2  
    does anyone has this info
  3. #3  
    Attached is the Headset Jack Spec from the Treo 650 Developers Guide.
  4. leonidm's Avatar
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    #4  
    Thank you!
  5. #5  
    Quote Originally Posted by GoodHw
    Attached is the Headset Jack Spec from the Treo 650 Developers Guide.
    Thanks, that was very helpful. Based on this, I am embarking on a mini project to make my own DIY y-adapter so that I can plug in an external microphone and an external headset/casette adapter to my treo.

    Only one question, does anyone know how the answer/hangup button on the treo 650 headset work?
  6.    #6  
    Jrd,

    As I understand, answer is and hangup is when when you short the mic lead to the ground.

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