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Thread: Forgot how to get rid of buzz??? how???

  1. #1
    Constant Bitrate
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    Feb 2000
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    AZ
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    Post Forgot how to get rid of buzz??? how???

    I thought i read somewher a while back about it.. anyways, computer is atx, running on a 140watt inverter, power supply is grounded to car chassis, using goldplated rca cable from rear to front, above doors to minimize interference, and to my aiwa cdcx407, but i still get a buzz at about half volume (level 40 for my stereo)... the aiwa has line level volume though, so i can set that to -4 volume and turn up master volume and it goes a bit louder without buzz (level 48)... that barely makes up for lowering line level volume though... so both are near same volume... how can i get rid of the buzz?? Do i have to get a dc-dc inverter instead?... And yes the ground works because when its not connected the buzz is extremely loud...

    Suggestions?????
    99 ram 5.9 turbo
    P4 2.0, MicroATX, Audigy2nx, Monster Cable / Alpine.
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  2. #2
    Newbie
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    Darwin,NT,Australia
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    Post

    I think you have to ground everything, power supply, inverter, case etc..

  3. #3
    Low Bitrate
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    Apr 2000
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    Post

    Consider installing a ground loop isolator. About $10-15 US at Radio Shack or other electronics store. Sometimes works, sometimes not. I still had engine noise (more whine than buzz) after doing all grounding. Installed the isolator and all noise gone. Most stores will let you take it back if it doesn't work.

    [This message has been edited by Kevin (edited 06-21-2000).]

  4. #4
    Registered User
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    New Concord, OH, USA
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    TimW,
    Having the same problem. I have the power and ground running from the power and ground of the head unit to the back of the jeep. I have the power supply grounded to the same ground. My mobo is in a plastic case so where would I ground it. I am not using the system due to the hum/buzz. I am also getting a little engine noise but I think a noise filter should solve that. My next step, uless someone has a better solution, is to run a ground wire from the bat. and ground everything from that, head unit, inverter, power supply, mobo??
    Anyone have a better idea.....

    I saw the gound loop thing at radio shack and it has RCA jacks. The back shows how to hook it up between head unit and an amp. How do you have it hooked up Kevin?


    [This message has been edited by mp3wrangler (edited 06-21-2000).]

  5. #5
    Constant Bitrate
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    landing, NJ, USA
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    Post

    this is my suggestion

    get the ground isolator from radio shack. this will cutdown a lot of your noise .. also ground all of your case, power supply motherboard, to same the same ground. then if there is still noise, get some capacitor and add it into your power line to trim down the noise

  6. #6
    Constant Bitrate
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    Feb 2000
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    Post

    Capacitators dont lower noise, they provide protection against surges in voltage. Im gonna try to ground the sound card with a small ground wire and see if that works.. if not ill probably cut off that little rectangle inside the powersupply that sproggy tells everyone to cut off.
    .. and my computer is in a wood case so cant ground case itself, but power supply is grounded, gonna try to ground sound card by that little screw that holds them metal mounting brackets on.......

    99 ram 5.9 turbo
    P4 2.0, MicroATX, Audigy2nx, Monster Cable / Alpine.
    Coming soon: Indash motorized, 5.1, dvdrw, gps, bluetooth, wifi, and more!

  7. #7
    Variable Bitrate
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    If your computer is in a wooden case, are the points where the mobo mounts grounded? I mean the standard screws that you would mount with those brass spacer screws.. Might help as well.
    MP3 Cavalier - http://www.mp3cavalier.com
    MP3 Grand Prix - http://www.mp3gp.com

  8. #8
    Constant Bitrate
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    landing, NJ, USA
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    Post

    just built your self a lowpass filter

  9. #9
    Maximum Bitrate
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    OK all, lets define some noise terms.
    A Ground Loop occurs when you use two different grounding points, and there is a slight variation in the voltage between them (Ground does not necessarily mean 0 Volts). A ground loop usually manifests as a hum or whine. The ground loop remover from Radio Shack is an isolation transformer, which is not always the best solution. Whenever possible, all audio system grounds should be tied together, with the wires in a star configuration.
    Buzz is usually some sort of RFI (radio frequency interference). Inverters are notorious for emitting RFI, which usually results in a loud, nasty buzz in the audio. This is because all wires are also antennas, and will receive the RFI, passing it onto the amplifiers and eventually the speakers.
    In my own (temporary) installation, I use my laptop with an inverter (Sony does not make 12V adapters! ), and I attach a ground wire to any one of the stud posts on the connection panel. It works beautifully
    KG6OQD
    www.americansandassociation.org

  10. #10
    Maximum Bitrate
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    Weirdly enough, i found a fix for my noise problems. A pig-tail. You know, the thing that converts a 3 prong cable into a 2 pronger. After i used that and plugged it into my inverter, everything worked fine. Try it!
    2004 F-150
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