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A small Doubt regarding headphone jack

Discussion in 'Electronic Repair' started by Nitin, Mar 7, 2006.

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  1. Nitin

    Nitin Guest

    I was wondering whether DC current flows or AC current flows from a
    headphone Jack. I am not sure because I was reading articles which were
    saying to measure the DC voltage between the Left and the right channel
    with respect to the ground.
    My question is how can a speaker produce varying output if DC current
    comes out of an Headphone jack.
    Please help me in clarifying my doubts. I am using the output from my
    PC sound card.
    Thanks
    Nitin
     
  2. DC FLOWS FROM THE HEADPHONE JACK BECAUSE IF IT HAS A 1/8 PLUG THERE'S A
    GOOD CHANCE THAT IT IS BEING POWERED BY A BATTERIE.
     
  3. Bob  AZ

    Bob AZ Guest

    Not hardy. The speaker is an AC device. It may have a DC quiescent
    current but responds to AC at the frequency of the audio signal

    Bob AZ
     
  4. The detail here is that the current in a headphone jack will vary, to
    produce the vibrations in the headphone's cone/membrane, to reproduce
    sound. But, unlike what some people consider AC current:

    A) The variation is not a stable wave with a periodic variance over time.

    B) Current varies between little or no flow, to a certain degree flow in
    one direction. "AC" current varies between one direction (polarity,
    charge) and the opposite, that is, it's state shifts between positive
    and negative flow.
     
  5. And significant DC current is a common way speakers get fried due to
    a defective amplifier.

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