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Thread: 3 months of fiddling around and NOTHING!!HELPP!!!

  1. #31
    Variable Bitrate Squid's Avatar
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    The laptop auto-adapter you got... is it a good brand? not some cheapy replacement model? Maybe its seen better days??
    When I got mine, I was recommended a LIND adapter as they were of good quality. If you've narrowed it down to the power supply, I would
    get on ebay and buy another of a different make.

    Good luck!
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  2. #32
    cheap custom title JC-S60's Avatar
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    Something that certainly makes a big difference with my temp setup now, is a capacitor just in front of the amp. It's actually 4x 10000 pico's I think.

    Try that behind your adapter, it filters out a lot of noise.

  3. #33
    Constant Bitrate
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    my $.02.

    When I was much younger and dumber, my friends and I would put together these half-assed stereo setups in our cars. We would get buzz all over the place in my car for some damn reason, and it was only when the car was running. When it was not, no noise (which makes sense... the alternator produces AC voltage, on battery there is only DC).

    This we eventually solved after many experiments, testing, etc. over weeks of time.

    Final outcome - the voltage regulator/rectifier for the cars' alternator was the issue. Once I replaced that, it all went away.

    So my thoughts:
    1) does it buzz when the engine is running, stopped, or both?

    If only when the engine is running, then it is likely in your internal system. If you have killed off all other options (grounds, put suppressor on the line), try a new alternator voltage regulator. Some cars like GM have the regulator actually IN the alternator. If this is you, buy an alternator at autozone and replace it (easy job.. less than an hour to do). You can return it after testing.

    If buzzing whether running or not, check your logical AC components (power inverter and charger for the laptop is the first thought). Pull off the inverter and charger and run lappy off of battery only. Does it go away? You said yes earlier I think. If so, then your lappy charger or the inverter is at fault, or possibly the 12v to the inverter. To eliminate the inverter and 12v, plug the charger into an extension cord instead. Still buzzing? It is the laptop or the charger. Borrow or beg another charger or try a different laptop.

    That should kill it....

    BTW laptops produce internal AC signals, so a crappy lappy can also get you. In that case it would likely occur with the lappy charger on or running off the lappy batt.

    HTH

  4. #34
    Constant Bitrate techeros's Avatar
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    well no not with my laptop. I have not persued it b/c I am building a new system. I only use the laptop for long dist. trips or when I start to go through withdrawls from not having my truckPuter. I just charge the bat and do a cd till bat charges then i run off battery....blah blah miss my truckPuter
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  5. #35
    Variable Bitrate The Grinch's Avatar
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    I have a few questions.

    - What's buzzing? The stereo speakers in the car or the built in speakers in your laptop, or both?

    - If you are feeding audio from your laptop to the head unit, how are you doing that? FM modulator? Aux inputs?

    - Again, if you are feeding audio from your laptop to the head unit, what is the source of audio? Headphone jack on the laptop? USB Audio?

    - Which laptop are you using?
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  6. #36
    FLAC SnyperBob's Avatar
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    Those are some good questions Grinch.

    I have problem with noise on my setup. I'm using an inverter with a Ice cube machine. Inverter is connected directly to the battery, but I'm sending the audio thru an fm modulator.

    I have a whole different can of worms with my setup, but it's been bothering me for the 2 years I've had it. Any suggestions here would be appreciated, but I'll try to find a thread more suited to my problem.

    In terms of the laptop, like Grinch asked - does the Buzz come from your laptop speakers, or your car speakers - via whichever method you use to input the sound to the car?

  7. #37
    Low Bitrate
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    Quote Originally Posted by outdidya
    yeah i grounded it , it gets a lil better but you can still hear it. uhhh, im about to throw this inverter out the window. i dont no what there is left to do. i think i just be one of the very few with noooo possible solution
    Do you have a ground loop isolator? I also had a slight buzz after I grounded my laptop. Not as loud as without the ground but as you mentioned, you can still hear it. But when I added a ground loop isolator, all the noise just went away.

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  8. #38
    Newbie outdidya's Avatar
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    Quote Originally Posted by slushieken

    If only when the engine is running, then it is likely in your internal system. If you have killed off all other options (grounds, put suppressor on the line), try a new alternator voltage regulator. Some cars like GM have the regulator actually IN the alternator. If this is you, buy an alternator at autozone and replace it (easy job.. less than an hour to do). You can return it after testing.
    well , that might actually be a good idea, but i got a 2001 porsche, and i dont think its a good idea for me to start changing all these internal parts. I kinda get the feeling if i touch something , **** might start falling off, or maybe i just get that feeling.

    Quote Originally Posted by The Grinch
    I have a few questions.

    - What's buzzing? The stereo speakers in the car or the built in speakers in your laptop, or both?

    - If you are feeding audio from your laptop to the head unit, how are you doing that? FM modulator? Aux inputs?

    - Again, if you are feeding audio from your laptop to the head unit, what is the source of audio? Headphone jack on the laptop? USB Audio?

    - Which laptop are you using?
    the buzzin comes from my speakers in the car when the laptop power is on. Once i turn my car off, the laptop still play the music thru the stereo, so im sure its the inverter/ maybe even the lilliput. I think a good percent is comin from the lilliput and a better percent is coming from the inverter.

    I have my laptop in the passenger side seat, with a usb wire going to the front trunk, connected the external soundcard to the input of the cd changer. so i turn on cd changer on my stereo and it serves as an aux.

    I am using a cheap *** KDS laptop. The company actually went out of business. However , i didnt really feel like buying a new one , or building a comp because i already have something(the laptop).

    i think i just might come to the fact that theres no way to get rid of the bussing. i mean , i tried everything.

    I tried the ground loop isolater bull****, it works a lil, however, the buzzin still gets thru and it jsut kills my sound quality, so thats not worth it.

    ahhhhhh. have no idea what else to try.

    i think im gonna start lookin for a different inverter. i dont think i will find one that is much better, but i guess if i could just tone down the buzzin a lil more so that its just bearable, i guess i would be able to live with that.

    anywayz , any more suggestions are great, ive appreciated all the help, thanks guys

  9. #39
    cheap custom title JC-S60's Avatar
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    Try the capacitor!

  10. #40
    Maximum Bitrate Change's Avatar
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    Plug a pair of headphones into the laptop, do you hear the buzzing with the engine running then?

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