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Thread: HELP! crackles noise...

  1. #1
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    Post HELP! crackles noise...

    IŽve connected my MP3 player directly to the amp of my car, bypassing the head-unit. Everything is properly grounded directly to the same point, and I get no noise or hum. However, I get some loud crackles frequently, especially in bumps or when I hit some holes in the road. I also have them when something hits the computer. The computer is powered by an 140W "modified sine wave" inverter.
    Is this a computer power supply related problem? Its strange, and I cannot get rid of it. Please help.

    Thanks.

    Ricardo

  2. #2
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    Mate it looks like a loss connection somewhere but its not in your inverter os PS.
    its most likely the RCA (the plug output from your sound card) if this is loss or not well connected you will hear some crackling noises and stuff... so check that and generaly check all the connections in side your case... press the soundcard incase its not fully in its place and also check the ground to the case this also can give you this sort of problem if it has loss connection

    ------------------

    Fosgate
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  3. #3
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    First of all, thanks for your help.

    It is not related to the signal. I hear crackles EVEN with the jack connected to something else. For instance, if I connect the jack to a discman, fine. When I turn on the computer, even if the signal is coming from the discman, I hear the crackles - the only connection between the computer and the audio system is the power supply!

    Odd, isnŽt it? This is a major head-twist...:-(

    Ricardo

  4. #4
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    What sort of PS are you using?
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  5. #5
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    Try to find out exactly what is causing the crackles.

    If you hear crackles with the inveter running but not not connected to the computer then the problem is with the inverter.

    If you only hear crackles with the computer plugged in then it a problem with the computer psu.

    If the problem is with the inverter and it is securely grounded then try putting a capacitor (large value) across the input terminals of the inverter.

    if it still crackles get the inverter replaced as it's probably faulty.


  6. #6
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    Try to find out exactly what is causing the crackles.

    If you hear crackles with the inveter running but not not connected to the computer then the problem is with the inverter.

    If you only hear crackles with the computer plugged in then it a problem with the computer psu.

    If the problem is with the inverter and it is securely grounded then try putting a capacitor (large value) across the input terminals of the inverter.

    if it still crackles get the inverter replaced as it's probably faulty.


  7. #7
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    Try to find out exactly what is causing the crackles.

    If you hear crackles with the inveter running but not not connected to the computer then the problem is with the inverter.

    If you only hear crackles with the computer plugged in then it a problem with the computer psu.

    If the problem is with the inverter and it is securely grounded then try putting a capacitor (large value) across the input terminals of the inverter.

    if it still crackles get the inverter replaced as it's probably faulty.


  8. #8
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    It must be the computer power supply fault. It is a regular AT power supply, I donŽt have any details.
    IŽll try to connect other power supply, this is very old (it belonged to a 486DX/33).
    IŽll send news when I get another PS and plug it.
    Thanks again for your help.

    Ricardo

  9. #9
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    I have a similar problem - I think? I dont have the setup in the car yet BUT I am picking up hiss especially when the computer is turned on.... The hiss is there running off the invertor and running off 240v mains.

    There is less hiss when the computer is turned off.

    My power cable to the amp is 1.5metres (unshielded).. could this be the problem? It will be shorter when it is installed.

    The soundcard (SB pci128) is connected to a sheilded 3.5mm>rca connectors. This is connected directly to my amp (Caliber CA 80wx4channels).


    HELP please.. :O)
    Cheers

    Duncan :O)

  10. #10
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    It's obviously a power problem. Which means that it can come from two sources: the inverter, or the computer ps.

    I myself had a crackly inverter (whistler 300W), simply exchanging it fixed my problem.

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