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Thread: PC Noise

  1. #1
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    PC Noise

    Have an epia800, and have to sound out hook to my Amp with RCA cables. Problem is there is alot of noise, sorta buzzing sound. I think it might be from the HDD, but not positive. Do notice that if I move the mouse the noise increases too. Could it be grounding issue? I have my dvd rom & hdd both grounded to the board.

  2. #2
    Raw Wave hijinks21's Avatar
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    ground your computer case/PSU to the same spot as your ground your amp. also if you use an inverter ground that to the same spot
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    Maximum Bitrate CrazyLittle's Avatar
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    no inverter. I grounded the psu to the same spot as my amp. Right now I have it out of my car and I still have that buzz.

  5. #5
    Raw Wave hijinks21's Avatar
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    onboard soundcard?
    '98 Explorer Sport
    http://mp3car.zcentric.com (down atm)
    AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
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    yes, onboard sound.

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    Maximum Bitrate osirisdon's Avatar
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    You know I also have a noise. My noise is only when sound is comming from my pc. Its like a static noise from a FM band. Dunno what the hell it is. Everything is grounded out. Although NOT grounded to the same spots, but just grounded. Hmmm I'll have to check it out.

  8. #8
    Maximum Bitrate CrazyLittle's Avatar
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    If you're getting the buzz with the computer out of the car, it sounds like you've got a bad cap for your onboard's amplifier, or else a broken sound card chip.

  9. #9
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    What PSU are you using?

    Try grounding everything to the same spot.

    What guage wires are you using?

    Where are your RCA cables running? Close to any power wires or near engine components?

    Laptops are notorious for the exact problem that you describe, when the HD gets accessed or you move the mouse you can hear a bit of a buzzing (eh, bad description) noise, but this is due to lack of shielding and/or crappy sound cards. If you can make sure to run all power cables far away, make sure that you have at least 10gauge cables, make sure that your +12V and GND cables are the same gauge, that might help. Otherwise I think that you are SOL.

    Can you record the noise by any chance? Maybe that'll help.
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  10. #10
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    well the problem doesn't seem to be in the car, cause I get the noise when I take the pc out. Its kinda like a white noise, not very loud, but when amplified, its is very audiable. Heres what I recorded by hooking the output to my desktop and recording it.

    Noise Sample

    I had to amplify it a bit to show what I'm talking about. Its a like a static, white noise. That buzzing is when I move the mouse. Not getting much of the HDD noise as I used to, but then again its not in my car.

    My Car audio setup shouldn't be a problem. All the power cables are 4awg. Has a good ground on the body (same gnd for pc). RCA and pwr cables are a good foot or more apart (our else I would've heard it from my HU)

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