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Thread: Ground noise in system

  1. #1
    Constant Bitrate TyBong's Avatar
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    Exclamation Ground noise in system

    I've got an old receiver I have modified into a carPC, I currently am powering this system by a power inverter (might I add is a complete waste of energy). I threw this system in my 02 camry, jack everything in, works fine. the problem is when the car is on, I have alternator whine through the speakers. I have made previous generations of carPC's in my other vehicles and I have always stressed to myself "ground everything" (pretty much), and the typical way I solved alternator whine was to ground the audio signal before it goes to my alpine deck to the frame of the car, usually that works. Except in the camry, when I ground the system, I get MORE noise and TONS of noise lines on the TVIEW monitor. I have also thrown this same system in my 91 full size blazer, no issues with that.

    If I just break down and get a DC-DC PSU would that solve the noise issue?
    Is the electrical system in the camry so different then the blazer where I would need a ground loop isolator?

    does anyone have any ideas?

    Thanks

  2. #2
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    I think if you buy a dc-dc psu it will benefit you. It may or may not make the ground loop go away

  3. #3
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    Switch-mode Inverters generate a hell of a lot of switching noise, which could be one of the problems.

    Grounding the audio negatives from the PC is not a good idea. They use what's called a "floating earth", which is not necessarily 0 volts.
    The best way to do it would be to use an isolation transformer/line isolator. You can get them many places, and work really well.

    Additionally, use a noise filter/suppressor inline with the power input to both the PC and the monitor. That should cure the problems.

  4. #4
    Maximum Bitrate neon_eddy's Avatar
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    are you the guy from minnesota?..

    I would agree, an inverter will most always make things more sucky, and indroduce that 60hz buzz.

    I made my own ground lift, or "audio isloator" from radio shack parts.. cost around $10 but it worked, and saved some money from using BestBuy's $40 solution. just get 2 audio isolators, as they are mono and use the common ground and I also got 2 audio connectors, male and female so it could be in-line. hope those help.
    Shawn



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  5. #5
    Constant Bitrate TyBong's Avatar
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    Cool, I work at a tv station with nuthing better to do somtimes, I think I may give that a try today, thanks for the imput

    oh yea, yes I am the guy from MN
    mabie I will not be lazy and fill out myprofile..... nope still too lazy Lol

  6. #6
    Maximum Bitrate neon_eddy's Avatar
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    ahh what do you do there? I do some TV production work.. animation and whatnot.

    you can try mine if you'd like.. as we live fairly close.
    Shawn



    Check out my web company Minneapolis Web Designer | MODx Web Design - Himmelberger Design


  7. #7
    Constant Bitrate TyBong's Avatar
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    Cool, I do pretty much everything here, from production to managing playback, I suppose my main title would have to be a tech. i.e. right now sitting in the server room full of fans blairing in my ear Lol

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    Please someone, correct me if I'm wrong, but I've read that inverters also create ~20% overhead in power draw. Just another reason to switch to DC-DC. Also, are all your components sharing a common ground or are they simply connected their nearest ground points?

  9. #9
    FLAC PURDooM's Avatar
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    Quote Originally Posted by TyBong
    Cool, I do pretty much everything here, from production to managing playback, I suppose my main title would have to be a tech. i.e. right now sitting in the server room full of fans blairing in my ear Lol
    He works in champlin for clarification.
    Current projects: iGmod reloaded (Latest release) (put on hiatus indefinatly)

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  10. #10
    Constant Bitrate TyBong's Avatar
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    One more question, what would explain the same system in the blazer not having issues?

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