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Thread: Induced noise/Ground loop trouble shooting guide.

  1. #81
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    laptop headphone jack noise

    Thanks for the tip. I was also experiencing noise, a ground loop isolator did the trick. I'm just posting my configuration here, in case someone else has the same problem.

    1) Laptop powered by an OEM laptop car charger (cigarette lighter).
    2) Headphone jack to RCA y-cable. {fix: insert ground loop isolator here}
    3) RCA FM modulator connected to the antenna of the factory car stereo.

    Without the ground loop isolator there was a high-pitched whine and a pulsating static sound. This only occured when the laptop was connected to the charger, there was no problem when running off the battery.

  2. #82
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    Talking Ground Loop Isolator solved my problem

    I tinkered and grounded till I was about to go nuts... I got everything much quieter, but the noises wouldn't go away. Most of my noise seemed to come from my computer, I could hear hard drives spinning up, fans spinning up, clicking from the hard drives over the speakers...

    I used on board sound with an EPIA EN15000 -

    Bought the ground loop isolator someone suggested and it is perfect now. I even removed all the extra ground wires I had connected first and still perfect..

    So if your time is more valuable than the$20 for the Ground loop isolator, which I am sure you could return if it doesn't work, start there...

    Just my opinion and experience...

  3. #83
    Low Bitrate S11D336B's Avatar
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    Also, I think you'll find that a better sound card would fix the problem and be a better way to spend your money. A Sound Blaster Live would work nicely
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  4. #84
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    Line in Noise

    Hi,
    I have read this forum and done a lot of searching still have not been able to solve my problem. Any help is appreciated,

    I am using a laptop, when on battery and on power I have no noise at all. As soon as I unmute the line in hte noise comes.

    I want to use XM so need the line in and want to get rid of the noise.

    I have tried external soundcards and still same issue. any suggestions other than DAC?

    Thanks

  5. #85
    FLAC
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    Quote Originally Posted by rumy View Post
    Hi,
    I have read this forum and done a lot of searching still have not been able to solve my problem. Any help is appreciated,

    I am using a laptop, when on battery and on power I have no noise at all. As soon as I unmute the line in hte noise comes.

    I want to use XM so need the line in and want to get rid of the noise.

    I have tried external soundcards and still same issue. any suggestions other than DAC?

    Thanks
    You have a ground loop between the XM and the Laptop. How are you powering the XM? How are you powering the laptop? I would recommend searching for USB soundcard noise problems. I would bet its the same type of thing.

  6. #86
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    Interesting alternator noise problem

    Ok here is the info:

    J7F2 powered by M2-ATX powered direct from battery, grounded to cigarette lighter. Using onboard audio to a JVC head unit.

    There was tons of noise (whirring etc + alternator whine) at first so I got a GLI hoping it would cure things.. well the whirring etc has gone away but the GLI seems to have taken away all bass (bad GLI?) and the alternator whine is still there..

    The interesting thing about it is that it will totally disappear for a while and then come back.. randomly, I have not been able to link it to any particular action/cause. This happened before the GLI install as well.

    Anybody have any suggestions?

  7. #87
    Constant Bitrate
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    Quote Originally Posted by Will Albers View Post
    You have a ground loop between the XM and the Laptop. How are you powering the XM? How are you powering the laptop? I would recommend searching for USB soundcard noise problems. I would bet its the same type of thing.
    I havent had any luck trying to find this, All I found is grounding issues and alternator whining, some posts people did mention to just mute the line in to get rid of noise, but I want to use the line in.

    The XM is powered from my stock amp which goes straight to the battery. Also when I connect the XM directly into the amp there is no noise, its a clean signal.

    Thanks

  8. #88
    Constant Bitrate
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    Quote Originally Posted by rumy View Post
    I havent had any luck trying to find this, All I found is grounding issues and alternator whining, some posts people did mention to just mute the line in to get rid of noise, but I want to use the line in.

    The XM is powered from my stock amp which goes straight to the battery. Also when I connect the XM directly into the amp there is no noise, its a clean signal.

    Thanks
    What XM receiver are you using? I had the same problem using the XMD. I got rid of it when I grounded the case of the XMD.
    Car-mada-puter Epia MII12000, 40gig HD, 512mb ram, Morex 3688 case, M1-atx and XP Pro.

  9. #89
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    can you explain how you are powering the XM off of the signal from the amplifier?

    are you using a speaker level signal to power it? or are you tapping into the power BEFORE the amplifier?
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    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  10. #90
    Newbie WinoOutWest's Avatar
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    One last noise...

    First off thanks for a great article! I've eliminated almost all my noise and ground loops thanks to the original posts. I eliminated my really irritating alternator whining and uncovered/resolved 2 issues: I had to re-run the signal lines on the other side of the car and to ground the PC Case and the Inverter. I have one remaining noice and I am wondering what my options are to get rid of this noise and if changing the inverter will help.

    The noise seems to be generated from DC-AC Inverter and I can't seem to get rid of it. I have the inverter mounted beside the PC which is also right beside the battery in the trunk as are the 2 Alpine V12 Amplifiers (a 4 channel driving front and rear speakers and a mono driving the sub). My head unit is an Alpine as well with now amplifiers on board just a 4v outs and the Aux line in from my PC. The noise is not present when I am using the radio or the CD on the Alpine. As soon as I switch it to the AUX I get the noise. If I run the PC directly from an AC line from the house I do not have the noise. I tried a ground loop isolator on the Line out from the PC and it seemed to make no difference. I have an Audigy 2 internal card as well as a Maya external USB sound card and it doesn't seem to make any difference in the noise.

    Currently I have the inverter, inverter case and the PC case grounded directly to the battery.

    I am beginning to suspect that its just a crappy inverter? Curious is I have any options. Do I need a better inverter or do I need to replace my inverter and shutdown controller with a DC supply?
    Cheers!

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