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Thread: Noise...Not sure how to get rid of...

  1. #1
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    Question Noise...Not sure how to get rid of...

    The last final issue in my setup is the buzz noise coming from my speakers...Its not a ground loop isolater problem...difrent buzz...It doesn;t matter if the truck is on or off...And the louder I make my volume on my head unit the louder the buzz..
    Scenerio: I have all the wires plugged in..(I am using an awia headunit..with the stereo jack in the front) I set my deck to AUX and turn it up to lets say 45 on the volume...There is no buzz..I turn my computer on...still no buzz..But once it plays the first start up toon I got the buzz...Now...My computer is in a shoe box (lol...I know but it works) The PSU is in the box as well...but its grounded...Does the motherboard have to be grounded? if yes..how? I have also tried multiple cables...RCA cables, stereo cables...Each cable though produces a slightly different buzz..Some louder then others..Any ideas guys?

    The sound card is a Aureal Vortex...
    I was reading through some other posts and they say to ground the inverter...How do u do that? I have a radio shack one...???

    Alright its my inverter...I just decided to unplug my inveter...and plug my Computer into the wall..And it work flawlessly...Now how do I ground this damn inverter...The inverter..gets its power from the fuse..and the ground just on the from body... where would u ground it?

    [ 07-20-2001: Message edited by: citrus3000psi ]

    [ 07-20-2001: Message edited by: citrus3000psi ]

    [ 07-20-2001: Message edited by: citrus3000psi ]

  2. #2
    FLAC
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    to ground the Inverter run a 12 gauge or larger peice of wire and ground it to the car frame to the case of the inverter. if you can, ground the inverter to the same spot you grounded the PSU

  3. #3
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    Thumbs down

    No Dice, I did that...I used 10 guage wire..and sanded down the side of the inverter to make a good connection...I hook it up and all it does is blow fuses.. My setup looks like this



    The red wire from the cig lighter...is just a + 12 volt on a 25 amp fuse... There are 3 black wires connected to the body, underneith the cig lighter...One is that 10 guage...to the casing of the inverter..One goes to the cig lighter for power...and the other goes to the PSU. Why am I blowing fuses? The Interver plugs into the cig lighter...

    I just added power to the inverter straight from the battery...Fused still of couse..Still...I have Noise..But i havn't tried that with a ground yet...Let me go try

    I just added the ground to the case of the inverter...Didn't blow a fuse...But didn't get rid of the noise..It also seems now..even if the computer is off...and my head unit is on and set to AUX...I get the noise...But once i pull the power cable from the inverter the noise is instantlly gone...I have no clue how to get rid of this inverter noise..??? Do they make like a noise filter for power wires?


    [ 07-20-2001: Message edited by: citrus3000psi ]

    [ 07-20-2001: Message edited by: citrus3000psi ]

  4. #4
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    If I were you, I would run heavier gauge wire for the +12VDC and I would also get rid of the cigarette lighter type connection and just cut it off and solder straight through.

    Then run the negative from the power inverter straight the car chassis where you ground everything else.

    Also, maybe I'm seeing this wrong but why do you have a wire going from the inverter casing to the cigarette connection?

    Just my suggestions.

    [ 07-20-2001: Message edited by: schrodos ]
    95 Honda Civic DX Coupe - In Progress
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  5. #5
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    Originally posted by schrodos:
    <STRONG>Also, maybe I'm seeing this wrong but why do you have a wire going from the inverter casing to the cigarette connection?
    </STRONG>
    Cause people told me to ground the inverter case. Negative is ground...etc...and the cig goes to the ground..

  6. #6
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    I run 4awg to the back (because I have amps) and then I distribute that to 12 AWG which connects into Oms' auto-shutoff circuit and from there 12 awg directly into the inverter. Then the negative of the inverter is hooked directly to the car grounding area. I don't have any noise what-so-ever and I don't ground my case or anything.

    Hope I'm helping... not hindering.
    95 Honda Civic DX Coupe - In Progress
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  7. #7
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    Having been using an inverter i narrowed down the buzz sound:

    1- ground your computer PSU case to same ground as your inverter. This SHOULD take care of MOST of the noise but not all...at least not in my attempts.

    2- If you have a separate amplifier connected to your speakers, try having all of them grounded together to a distribution block. The same goes to the power cables too...

    3- Ground your computer PSU to the head unit ground or the amplifier ground whatever is connected to the speakers

    About #3... With my setup where everything is powered up from same source except for the head unit, this ONE ground cable( using aligator clip) got rid of ALL the noise...and i mean ALL OF IT...zero...

    It is very simple solution and it makes sense too..because your computer is isolated by the inverter so connecting the computer PSU to the amp ground ( which is driving my speakers) should take care of it.

    In the same way, ground your computer PSU to the head unit ground I bet you will get rid of all the noise ... and don't get the GLI, you don't need it if you ground everything correctly.
    My GLI now collects dust....

    Hope this helps...cheers! you are almost there.
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  8. #8
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    Originally posted by moahdib:
    <STRONG>About #3... With my setup where everything is powered up from same source except for the head unit, this ONE ground cable( using aligator clip) got rid of ALL the noise...and i mean ALL OF IT...zero...
    </STRONG>
    I would agree. Grounding all devices to the same ground point is a good idea, and works great in my system too. Also I power everything from one source direct from the battery since I dont have a head unit.....
    Project - GAME OVER :(

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