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Stereo to mono

Discussion in 'Electronic Basics' started by ClueLess, Feb 4, 2008.

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  1. ClueLess

    ClueLess Guest

    Hi Folks

    I have a small MP3 player and I want to use only one earphone, that is
    mono. The output from the player is stereo.

    Can I just join the two stereo lines to the earphone. Or it requires
    some resistors before they are joined to the phone. If so what is

    Many thanks for your time and attention

  2. Jamie

    Jamie Guest

    It may work ok joining the 2 together how ever, why not
    chance it and just use 2 resistors to make sure.
    Not sure of the impedance of the output of that thing
    but it maybe like 16 or 32 ohms.
    Try 2 47 ohms in a T network connection from LEFT and
    RIGHT channels.
  3. Guest

    Depending on the drive circuitry a direct short may damage your
    stereo. A quick search shows varying DC impedances for earphones, but
    they are generally high -- running upwards from 500ohms to over 1k.
    You could simply run each output through a resistor then short the
    other ends of the resistors together and drive your earphones in
    series. Ideally, you want to know the dc resistance of your earphones
    and make sure the resistors are very low in comparison (say 1/10th).
    But, assuming that your phones are in the range previously quoted a
    value of 16 - 47 ohms would be fine. The output power from an MP3
    player will be low enough that a 1/8W resistor will be fine. Keep in
    mind these are all suggestions based on the minimum info provided. To
    do a proper job, you should follow the actual calculations the
    suggestions point to.
  4. ClueLess

    ClueLess Guest

    Many thanks Jamie and Wolfenhawke for the fast response.

    The supplied earphones show a DC resistance of 32 ohms. To be on the
    safe side I will use two 87 ohms resistors which I hope will not much
    reduce the output levels, at the same time giving enough load.

    Thanks again

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