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Thread: Got my PC in the car!!! But it has tons of noise. Help!

  1. #1
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    Got my PC in the car!!! But it has tons of noise. Help!

    I got my computer in the car today, it looks awesome, but there is tons of noise from the inverter. I have a 300w inverter, and the noise overpowers the music when I have the head unit on AUX, and the noise even leaks through to the CD funtion if the inverter is on. There are no noise problems with the inverter off, but then there's no power to the PC either

    Can I fix this just by running a wire from the casing of the power supply to the bare metal frame of my car? Or should I use a ground loop isolator?
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  2. #2
    FLAC bosstone74's Avatar
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    ground the motherboard to the frame of the car!....that should fix it....
    BossTone74

  3. #3
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    The motherboard? I thought it was either the power supply casing for the computer case.
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  4. #4
    Raw Wave hijinks21's Avatar
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    did you even bother to search. There are a lot of threads on noise.

    1) ground your inverter to the same spot you ground everything else. ie computer PSU. sound card (if you do it). amps if you use em.. etc

    2) what kind of noise is it? does it increase when you step on the gas if so that's alternator noise and you need a noise supressor in between the inverter and battery.

    chances are if you ground your inverter to the same spot on the car as your PSU you'll get rid of most of it. if they are grounded in different spots you created a ground loop and thats no good.

    also if you ground everything to the same point in your car you won't need a ground loop isolator. Only use them as a last case anyway.. I feel they take away on sound quality
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  5. #5
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    ok dumb question, to ground the inverter, do I need to to run the ground pin of the cigarette plug to the frame, and just a wire from the PS casing to the frame?
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  6. #6
    Retired Admin Aaron Cake's Avatar
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    Please use the search feature. Every kind of noise in existance has been covered hundreds of times before. You will find your answer a lot quicker then waiting for others to respond.

    Ground the PS casing to the frame of the car. Ground the motherboard to the same place.

    But really, to totally eliminate noise, loose the inverter.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
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  7. #7
    Raw Wave hijinks21's Avatar
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    run the inverter from the battery not off the cig lighter. 300 watt is way too much for that small wire. use like 10 or 12 guage wire right from your battery to the inverter then take the neg end coming out of the inverter and ground that to the same spot you ground you psu and such.
    '98 Explorer Sport
    http://mp3car.zcentric.com (down atm)
    AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
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  8. #8
    Jay
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    Have you tried using the computer in the car power it from an external source? If you are using the on board sound card sometimes they are pretty noisy. Just want to make sure that it really the inverter that is making the noise.

  9. #9
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    I fixed it, just had to ground the computer to the frame.
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

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