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Headphone output current

Discussion in 'Electronic Design' started by Tim Kendall, Jun 19, 2007.

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  1. Tim Kendall

    Tim Kendall Guest

    I want to use the headphone output from an MP3 player to drive a
    homemade audio amp. How can I be sure I do not damage the headphone
    output by drawing too much current?

    Tim K.
  2. Normally this would not be a problem, as headphones are about 32 ohms
    impedance, and your homebrew amplifier should be a much higher
    impedance, say 10000 ohms.

    But if you get your amp design wrong, I would suggest a series
    resistor of say 1Kohms in series with a nonpolar capacitor of 47uF
    63V, to protect your MP3 player

  3. Eeyore

    Eeyore Guest

    Well you won't.

    An amplifier's input has a higher impedance than your headphones so it'll draw
    *less* current. And yes, that's safe.

  4. Meat Plow

    Meat Plow Guest

    That won't happen. More likely damage the input of your amp unless you
    designed it to accept signals of a 1000mv or so.
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