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Thread: Questions regarding ground noise.

  1. #1
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    Questions regarding ground noise.

    So I have ground noise. I read the "Induced noise/Ground loop trouble shooting guide" and got somewhat of an understanding, but I still have some questions.

    Here is my basic setup, stock head unit, pie adapter, connected to a aux in converter to my computer using a rca input to 3.5mm stereo plug adapter.

    I have my pc being powered by a decent inverter. When I plug it in I hear a constant buzzing that gets louder when you turn the volume up, but stays constant at rev'ing. I heard music, but its very low under the buzzing sound.

    I unplug it and connect it to my laptop works fine. Mp3 device, it works fine. I plugged in the power adapter for the laptop to my inverter, works fine. I then assume its the pc. This is a brand new aopen mini pc so I haven't even connected it to speakers yet because it has a built-in one. So I think it might be the sound port because I've never heard this type of sound before so I plug in headphone and it works fine. The computer still powered by the inverter. I thought it might be sort of interferance because its in my glove compartment so I move it to the back of my car outside my car for testing purposes and its the same problem.

    I've unplugged everything from the pc except the power and nothing is plugged into my inverter other than the pc. It still makes the buzzing when I plugged in the stereo jack.

    So I move my computer and inverter to my friends car and plugged it in and no sound nothing, clear as sound can be coming from a computer.

    Anyone have any ideas?

    I have yet to get a ground loop isolator, but I wasn't sure if I needed one because it works with a laptop and any mp3 device.

    Added
    Will installing my CarNetix CNX-P1290 fix this?

    I read somewhere, but can't find the specific post. Why can't I connect it to the battery ground again?
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  2. #2
    FLAC
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    Did you ground your PC case?

  3. #3
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    Quote Originally Posted by Shadow View Post
    Did you ground your PC case?
    No, not quite sure how with an Aopen mini PC. I opened it up and theres no power supply box that they have on regular computers.

    Wasn't sure if thats the problem, because I moved the pc to my friends car with the inverter and pc and plugged it into his line in, and it worked fine. Moved it back into mine and had the same things plugged in and I got ground noise.

    I can post pictures of the case if you guys want.
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  4. #4
    Car Audio Moderator durwood's Avatar
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    ground the chassis of the invertor to the car.

  5. #5
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    Quote Originally Posted by durwood View Post
    ground the chassis of the invertor to the car.
    Do I need to drill a hole into the case? Or can I add a wire to the existing ground.

    If thats the problem how come my friend didn't get any ground noise?
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  6. #6
    FLAC
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    You have to ground the chassis of the inverter. Your friend simply has a better electrical system than you

  7. #7
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    Quote Originally Posted by Shadow View Post
    You have to ground the chassis of the inverter. Your friend simply has a better electrical system than you
    Tear, 0 for 06 mazda hatch, 1 for 91 mazda 626
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  8. #8
    Car Audio Moderator durwood's Avatar
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    Tear, 0 for 06 mazda hatch, 1 for 91 mazda 626
    hahaha. Ya but I bet your 06 mazda6 is much nicer than the 626. Really though some electrical systems just act differently.

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