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polarity help!

Discussion in 'General Electronics Discussion' started by fundash, Jul 16, 2010.

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  1. fundash

    fundash

    8
    0
    Jul 16, 2010
    I am a very heavy sleeper and so I am adding a 3.5mm jack to the alarm to plug my computer speakers into for louder volume. I really am wondering which wire is positive/negative that goes to the speaker. Both wires are grey, but one has a pink stripe on it. does this mean that the wire is to positive or that it is ground?

    btw,I use conventional flow. not electron

    here is a pic: [​IMG]
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    If you're talking about isolated speakers here it hardly matters, but if there are common grounds of some form involved then it could.
    But to give a certain answer we'll need a better description/explanation/picture of the items/wires/pcb's. Wire colors like these can't be used to tell anything.
     
  3. fundash

    fundash

    8
    0
    Jul 16, 2010
    well, all i'm doing is pluging these:[​IMG]


    into this:[​IMG]


    using this:
    [​IMG]
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok, it seems we are dealing with stereo here, is that so? We'll need a pic of where those speaker wires are connected to the pcb, preferably from both sides if possible.
    I figure the computer speakers are powered, with a volume knob.
     
  5. fundash

    fundash

    8
    0
    Jul 16, 2010
    The speakerss are not pluged into any pcb, just the wall adapter and I know that the jack goes ground, left and right positive. I don't know if the polarity even matters in this case because sound quality doesn't matter.
     
  6. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    I'm sorry, I meant the speakers in the alarm clock. I believe your first picture was from that?
    If you intend to use both right & left channels then there's a common ground that has to be used for the jack. Getting that wrong will short out the output amp in the clock.
     
  7. fundash

    fundash

    8
    0
    Jul 16, 2010
    The clock only has one speaker, the other side is just for looks :p:rolleyes: so, What i did with the jack was connect the left and right speakers because otherwise the sound would only end up comming from one computer speaker.

    I'll have a picture of the pcb this morning, have to goto bed now, goodnight :)

    P.S. Also, I want to get this right the first time as on the back, it clearly says "DO NOT OPEN, RISK OF ELECTRICAL SHOCK!" I feel that after I plug it in, that warning might actually become true. :eek:
     
    Last edited: Jul 18, 2010
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