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ear buds

Discussion in 'Electronic Repair' started by mm, Nov 26, 2007.

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  1. mm

    mm Guest

    I finally bought an MP3 player and the ear buds keep falling out of my
    ears.

    Went to buy a nother pair, and the first ones were 16 ohms which
    seemed high, but the next were 24 and the next were 32!!!!!

    Seems to me the battery would last longer with high impedance ear buds
    but the volume would be lessened. I'm using maximum volume now
    sometimes, so I don't want that. I'm confused.
     
  2. It's true that for a given signal voltage, a 32 ohm speaker will draw less
    current than a 16 ohm speaker, and you should get slightly longer battery
    life.

    But the loudness of a speaker is determined not only by how much power it
    consumes, but its efficiency -- how effectively it converts that power into
    sound. And its efficiency has nothing to do with its impedance.
     
  3. James Sweet

    James Sweet Guest

    Either way the audio is a miniscule part of the total current draw of one of
    these players. The battery lifetime difference between full rated power and
    muted is perhaps a few minutes.
     
  4. mm

    mm Guest

    What about in full size receivers and amplifiers, from say the 60's
    to 80's. I got the impression somewhere that in those devices the
    output stage used more than all the prior stages combined, right?

    Does accessing memory in an MP3 player etc. take much current?
     
  5. James Sweet

    James Sweet Guest

    That's true of pretty much all stereo receivers, but we're not talking about
    stereo receivers, we're talking about a portable device capable of
    outputting a few milliwatts to a pair of earbuds, not a few tens to to a few
    hundred watts to big speakers.

    The biggest user of power is the hard drive and display on players so
    equipped.
     
  6. mm

    mm Guest

    Thanks again.
     
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