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Thread: Help! High pitch ringing noise!

  1. #1
    Constant Bitrate knownchild's Avatar
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    Help! High pitch ringing noise!

    When i start my car there is an instant ringing noise in my rear speakers and this is the same for when im playing movies or just simply running windows, however if i open Everest and start a CPU stress test the noise go's away 100%

    Any ideas as to what could cause this?
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  2. #2
    MySQL Error soundman98's Avatar
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    it could be a ground loop. :/

  3. #3
    Constant Bitrate knownchild's Avatar
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    Ive installed a ground loop isolator and still the noise is present and when i rev my engine i can hear the noise get louder, also it sounds as though i can hear my hard drive running.
    Never accept STOCK equipment.

  4. #4
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    I had a similar problem with my current project. My nettop was producing a high pitch noise. It was happening without any modifications - I just hooked it up to test it and notice that the noise was coming from the headphones. The noise changed when there was hard drive / cpu activity, and even when the mouse cursor moved across the screen. I think it's just a crappy sound card. I recommend you get a USB sound card - I've bought a couple on newegg for about $24 a piece (I needed two). They are 5.1, have Mic In and stereo Line in.

  5. #5
    Constant Bitrate knownchild's Avatar
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    I have a usb sound card already and the sound is still present.
    Never accept STOCK equipment.

  6. #6
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    I would try to isolate the issue by removing the unknowns one by one.
    First, hook up your car pc to a stable 12V line, not the IGN/BAT line. I'm not sure how your system is hooked up, so if you have a third party amp, you can keep the amp powered by the car, but the pc powered from an outlet (you'll need a looong power extension cord).
    If the noise is still present, plug in a set of small computer speakers (powered by a separate power supply) and see if the noise still shows up. If it does, it sounds like your usb card might be crappy. Not necessarily broken, just crappy.

  7. #7
    Constant Bitrate knownchild's Avatar
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    Quote Originally Posted by nivanov View Post
    I would try to isolate the issue by removing the unknowns one by one.
    First, hook up your car pc to a stable 12V line, not the IGN/BAT line. I'm not sure how your system is hooked up, so if you have a third party amp, you can keep the amp powered by the car, but the pc powered from an outlet (you'll need a looong power extension cord).
    If the noise is still present, plug in a set of small computer speakers (powered by a separate power supply) and see if the noise still shows up. If it does, it sounds like your usb card might be crappy. Not necessarily broken, just crappy.
    The carputer is powered by a 10 gauge wire connected directly to the battery, and its a creative sound blaster 5.1 sound card. I will give the speaker test a try, thank you
    Never accept STOCK equipment.

  8. #8
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    Yeah, the first and easiest test is to unplug the headphone jack that you have leading to the amp and plug in a pair of headphones. If the noise is present, then the amp is fine.
    What I meant about a stable 12V line is that you can use a 12V PSU plugged in a power outlet in your house and power your system (sans the amplifier of course) that way. If the system does not make any noise while powered from the psu, but makes noise when powered from the BATT, then it's a problem with either your PSU creating too much noise or with your carputer not being properly grounded. Ground loop isolators would remove noise if there's a difference in ground between amp and a sound card, but if the noise is generated within the soundcard, GLI's won't get rid of that.

  9. #9
    Constant Bitrate knownchild's Avatar
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    Ok

    How do you ground the motherboard? the mount points just touch the pcb board.
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  10. #10
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    That part I'm still trying to figure out myself. If your mobo is grounded through the standoff mounts, then you have two grounds - one is the mobo/standoffs/whatever-else-the-standoffs-are-attached-to, and car ground (GND wire). Mind you, I only learned about ground loops about 2 weeks ago, so I might be talking out of my ***. Maybe soundman has better advice? after all, he is sound-man

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