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Cheese Computer Speaker System

Discussion in 'Electronic Design' started by Cliff, Sep 1, 2003.

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  1. Cliff

    Cliff Guest

    Please don't ask me why but I would like to take the speaker output of my
    sound card in my computer and connect a cheese speaker to it to be able to
    get some sound. The volume and quality of the sound are not a real issue.



    The type of speaker that I would like to use is something like the first
    speaker on the list from the following link:

    http://www.allelectronics.com/cgi-bin/category.cgi?item=SK-232



    My question is, could I just peel the cables coming out from the sound card
    wire and connect it directly through the speaker or do I have to have to
    build some kind of circuit between the wires and my cheese speaker for it to
    work (I hope I don't bacause I have no clue on how to do it!!).



    Thank you.
     
  2. N. Thornton

    N. Thornton Guest


    Hi. Depends on your sound card. Some will drive speakers, some wont.

    Regards, NT
     
  3. Actually, since the speaker that the OP mentioned claims a 32 ohm impedance,
    it can be driven from a headphone output. If the sound card will drive
    headphones it'll be able to drive that speaker. (Probably not very loud,
    though.)
     
  4. Why not? Camenbert and Brie offer the best acoustical properties but
    tend to go soft and smelly in the summer months. But we must all
    suffer for our art and audiophiles are no exception.
     
  5. Generally speaking, silicon-based amplifiers (as opposed to vacuum tube
    amps) have a minimum impedance they can drive; if the load has less
    impedance than that, the amp tends to overheat and destroy itself or at
    least shut down.

    Headphones generally are around 32 to 100 ohms impedance, with some oddballs
    being as low as 8 ohms (very unusual these days) or as high as 600 ohms
    (only a few models). So, something rated to drive "headphones" can
    generally handle loads of 32 ohms or more, but may not be able to go lower
    than that safely.

    Most "ordinary" speakers are rated at 8 ohms, with 4 ohms and 16 ohms also
    being fairly common values. 32 ohms, like the speaker you showed, is
    unusually high.

    However, headphones are also MUCH more efficient than speakers, because
    they're attached to your ears. So where 10mW is plenty to drive a headphone
    to comfortable listening levels, you need around 100mW to get much volume
    out of a little speaker like the one you showed. So, a "headphone" output
    may not be able to produce enough power to drive speakers.

    All this is only relevant if your soundcard does a headphone output and
    doesn't have a speaker output. If it only has a line output, then you need
    some sort of amplifier; if it has a speaker output, then it'll probably work
    with whatever you plug into it. So maybe you should tell us more about your
    sound card at this point.
     
  6. It says it has a "line out." That generally means that it does not have
    enough power to drive headphones or speakers; it needs to be plugged into
    some sort of amplifier.
    You can either buy powered speakers (which are a combination of a speaker
    and an amplifer in the same box), or you can buy a separate amplifier and
    hook it up to your speakers.

    "Line out" is like what comes out of, say, the audio output of a cassette
    deck or a DVD player. (Or any other home hifi component.) You can plug
    that line out into the input of anything that you could plug a cassette deck
    or DVD player into. If you've got a boombox with an auxiliary input, that
    would work. If you've got a spare input on your home hifi, that would work.
    You can also find small low-power marginally-okay-sounding audio amplifiers
    in kit or ready-assembled form; Google for "audio amplifier kit" or even
    "audio amplifier kiosk kit". Try to find one that has power commensurate
    with the speakers you intend to use (e.g., if you use 0.5W speakers, try to
    find an amp that's between 0.25W and 1W).
     
  7. Cliff

    Cliff Guest

    Thanks Warter, that was some great info, I appreciate it.



    Thanks again.
     
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