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Thread: Laptop Power Supply

  1. #1
    Variable Bitrate
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    Greensboro NC
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    Laptop Power Supply

    I just got my Laptop Power supply from MPJA im gonna post pictures of it soon on my site (<a href=http://catlas.mp3car.com>catlas.mp3car.com</a>) as soon as possible. Im having one problem with it tho. I hooked it up to a multimeter and tried to read the voltage between the +12 and -12 and i end up reading 24 volts. why?

  2. #2
    Newbie
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    Jul 1999
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    Norway
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    The differense is 24 volt.
    Where did you bought it?
    How much?
    Please msg ME

  3. #3
    Variable Bitrate
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    Greensboro NC
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    So if i hook the +12 and -12 to the motherboard it wont blow up?

    I got it from www.mpja.com for 15 bucks.
    Its very small and im gonna post a picture of it on my website soon.

  4. #4
    Newbie
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    Jul 1999
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    Norway
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    -Read the voltage betwen +12 and gnd U wil see 12 volt (black on gnd)
    -Read the voltage betwen -12 and gnd U wil see -12 volt (black on gnd)

    It would function Greate..
    I didn't find the power suply, Got it so U can connec6t 230 V ac When U are in your garage ?
    Get a picture up FAST.....
    Looking forward to it.


  5. #5
    Variable Bitrate
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    Well see thats a problem. there is no ground pin....would it be possible to ground the componets directly to the chassis of the car?

  6. #6
    Low Bitrate
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    East Brunswick, NJ, USA
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    Well I'm far from being the electronics guru, but you should have a +12 wire and a ground wire coming from your cigarette lighter. You're going to have to put your power supply inline with that so just follow the traces for where you put in the +12 and Ground and see where they end up on the power supply PCB. Alternatively, open your motherboard manual and see what wires on the motherboard power leads are ground and follow those back in the power supply to see where they go.

    Or did I misunderstand your question?

  7. #7
    Variable Bitrate
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    hmm...i think one of us is missing something. let me describe my problem with more detail. The Laptop Power supply provides outputs for +12 -12 +5 -5 etc. but there is no ground output on the power supply. However on the input connector there are pins to connect +12 and -12 from a battery. thats basically what ill be doing in my car. so could i hook up the hard drive ground wire directly to the cars gounding point which is the chassis and hook up the +12 from the power supply to the HD?

  8. #8
    Low Bitrate
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    You get +12 and ground from the car battery, you don't get a -12. The black ground wire on the HD connector you can connect straight to the ground coming from the cigarette lighter. You can't simulataneously draw +12 and -12 from the battery. If you measured -12, you probably puts your multimeter probes on backwards You can get -12 and ground or +12 and ground depending on where you hook up your positive terminal.

    If you connect all your ground wires to the cigarette lighter, it should be fine. If you hear engine whine, then worry about connecting the ground wires to the same spot where your head unit is grounded or get a ground loop inductor ($15). Mine works great and I don't have to mess with extra grounding considerations.

  9. #9
    Variable Bitrate
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    The supply his inputs to hook to the positive and negative side of a battery. so if i hook up the positive side to my cigarette lighter wires and the negative input to the ground it will work? and then i will hook the positive 12 volt output to the motherboard and then wire the motherboards ground connecters to the chassis of the car? this isnt just a laptop car adapter. it is the actually power supply circuit out of a laptop.

  10. #10
    Low Bitrate
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    I'd almost be willing to be that the cigarette lighter plug is a pair of wires with one being +12 and the other ground. It has to be, I mean if you plug in a CD player adapter, you don't ground the CD player separately so there MUST be a ground wire. Check it with a multimeter. Like you said you hook the +12 wire to the +12 input and the ground wire to the -12 input. You can also hook up the motherboard ground to this ground wire, you don't have to (and probably shouldn't) ground your motherboard to a different spot than the power supply. You can put everything on that 1 ground.

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