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Stereo to 2-channel mono question

Discussion in 'Electronic Basics' started by JK, Aug 9, 2011.

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  1. JK

    JK Guest

    I posted this last week in sci.electronics.design but got no responses.
    Probably it's too basic. Anyway...

    I'd like to make a small male/female patch-cord that would passively
    mix-down stereo headphone output to two-channel mono.

    Assuming typical MP3 player drive levels, is this circuit OK?


    Plug > -- to -- > Jack
    ~~~~ ~~~~
    Left __[R1]___.__.__ Left
    Right __[R2]___| |__ Right
    Common _______________ Common

    R1 = R2 = 1000 ohms


    Thanks for any advice!

    ..
     
  2. Tom Biasi

    Tom Biasi Guest

    "JK" wrote in message
    I posted this last week in sci.electronics.design but got no responses.
    Probably it's too basic. Anyway...

    I'd like to make a small male/female patch-cord that would passively
    mix-down stereo headphone output to two-channel mono.

    Assuming typical MP3 player drive levels, is this circuit OK?


    Plug > -- to -- > Jack
    ~~~~ ~~~~
    Left __[R1]___.__.__ Left
    Right __[R2]___| |__ Right
    Common _______________ Common

    R1 = R2 = 1000 ohms


    Thanks for any advice!

    What do you mean by "two-channel mono"?
    It may be me but I don't know what you want to do.

    Tom


    ..
     
  3. JK

    JK Guest

    I want to plug one end of the patch-cord into an MP3 player and then
    plug earphones into the other end of the patch-cord. Then, at *each*
    ear-piece I'd like to have an L+R mono signal.

    ..
     
  4. George H.

    George H. Guest

    The cheap 'ear bug' sitting on my desk has a resistance of ~ 30 ohms. So
    with 1 k's I think you'll need some gain after the mixing. If you wanted to
    do it without any post amplification then I think you could pick some
    'mixing' R's that match the resistance of the head phones you are using.
    You throw away 1/2 the signal that way, but it's simple.

    George H.
     
  5. JK

    JK Guest

    Yes - L+R at each output channel.
    OK. The mono device is just headphones.

    My main concern was loading and/or cross-connection of the MP3 player's
    output drivers - that's why I picked 1K mixing R.

    Thanks for the reply!

    ..
     
  6. Rich Grise

    Rich Grise Guest

    Why?

    Thanks,
    Rich
     
  7. Guest

    Yes. That's how it's done.
     
  8. JK

    JK Guest

    At work, it's better to keep 'one ear open' and since my MP3 player(s)
    don't have a stereo/mono select, this seemed like a good work-around.

    ..
     
  9. Rich Grise

    Rich Grise Guest

    Ah, got it. :)
    Rich
     
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