electromagnetic inference in sound card

Discussion in 'General Hardware' started by milecastle, Jan 7, 2006.

  1. milecastle

    milecastle OSNN Junior Addict

    Messages:
    35
    My sound card (Phillips PSC724) keeps making a funny noise when my computer does anything graphically intensive (like play game or movie) I have worked out from asking around that it is from my graphics card (I only have 1 PCI slot and 1 AGP slot!). I confirmed this my removing that graphics card - the sound stopped.

    Is there anyway to shield my sound card from this inference? Thanks
     
  2. Steevo

    Steevo Spammer representing. Political User Folding Team

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    Possibly noise across the PCI bus caused by a plethora of possibilitys.

    And considering the first PCI slot is shared on the same bus as the AGP bus when the system is intensivly using the AGP bus it sends noise to the rest of the bus.

    Sorry dude.
     
  3. falconguard

    falconguard Carbon based lifeform Political User Folding Team

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    Probably not what you want to hear, but you could consider an external soundcard solution.
     
  4. zeke_mo

    zeke_mo (value not set) Staff Member Political User Folding Team

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    You could try another sound card, I know creative has some low lvl cards that you could order to test it out.
     
  5. LeeJend

    LeeJend Moderator

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    Location:
    Fort Worth, TX
    Possibilities:
    Audio channel is being overdriven.
    Weak power supply
    Electrostatic coupling between vid adn audio cards.
    Incompatible drivers (sound, video or something DX9 related)

    Audio channel is being overdriven.
    Open the windows sound mixer (speaker symbol in the tay or go to control paenl sound advanced). Make sure none of the slider controls is above 50%. If they are the speaker amplifiers may be over driven.

    The power supply.
    How hefty is the supply (450-500W)? Does it have dual 12V rails. Is it a major name brand. Hoewmuch equipment do you have laoding it?

    It could be electrostatic coupling between the cards.
    I doubt it is electrostatic coupling becasue that would not be an issue in a movie, only during gaming. Movies put very little load on the video cared.

    Get a peice of aluminum foil the size of the audio card, sandwich the foil between 2 peices of thin card board (serial box, cookie box, etc) with a wire coming out. Build Instructions - Lay cardboard 1 down, lay the foil on top, run a thin strand of wire from side of the foil to the other with 5 inches extending out past the edge. Tape the wire down against the foil with scotch tape. Lay the other cardboard on top. Lastly Run a strip of scotch tape around the edges so no metal can be touched except the wire coming out. Slip your brand new Faraday shield bewteen the cards, preferably scotch tapped to the sound card so it won't block the video card fan. Take the wire end and run it to the backpanel screw for the sound card and wrap it around the screw once before you tighten the screw down. Cut off the excess wire.

    Driver issues is always a possibility.
    Unlikely with these symptoms but... Make sure you have the latest audio card drivers and video card drivers. Check the audio and video card websites and read their FAQ's email their customer support.