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Building adapters

Discussion in 'Electronic Basics' started by [email protected], Nov 24, 2008.

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  1. Guest

    Many times over the years I have wanted to make an adapter from one
    jack to another. Inevitably I end up wondering if I need to add a
    resister or capacitor to the usually obvious connections. Can someone
    explain how I should be thinking about this and how to figure out what
    discrete component I may or may not need? When I look up information
    about each end of the connection, all I usually find is an impedance
    rating for each. (I haven't looked impedances up yet for my example

    The current project I have is to be able to plug my (amplified! I'm
    hearing impaired) cell phone headset (1/8" stereo jack: one conductor
    for the microphone, one for the mono headphones, and one for ground)
    into my computer, which takes the (typical) 1/8" stereo jack normally
    used for stereo speakers and a 1/8" mono jack for a microphone input.

    Using the following numbering scheme...

    Headset jack: (1) sheath/base = ground, (2) middle conductor =
    microphone, (3) end conductor = mono headphone. Stereo computer
    speaker jack: (4) sheath/base = ground, (5) middle conductor = Left
    speaker, (6) end conductor = Right speaker. Mono computer microphone
    jack: (7) sheath/base = ground, and (8) end conductor = microphone.

    My oversimplistic approach would be to connect (1) to (4) & (7), (2)
    to (8), and (3) to (5) & (6).

    I might have the positive conductors switched on the stereo
    connections (I haven't checked for which is which), but I think this
    example makes clear what my simplistic approach is, and may be useful
    for someone's response. My thoughts always run toward "impedance
    matching" (whatever that is), but I don't really know enough to run
    with it from there.

    Thanks for any help anyone can give!

  2. neon


    Oct 21, 2006
    WHAT INPEDANCE IN A CONDUCTOR? for audio a wire is a wire.
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