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Thread: Problems w/ something :-) plz help

  1. #1
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    Post Problems w/ something :-) plz help

    Ok I am trying to troubleshoot my mp3 box, and have done a lot of testing. I have a lot of info, but am looking for a good opinion on whats next. Heres some info:

    My mp3 box is connected directly to my amp, when I plug my ps in to my ac/dc inverter i get a really bad buzz. If i plug my ps into a lead coming from the house i get a much better sound, but still some scratchy fuzz.

    Now to test i took my laptop and plugged the same cable into the same input on my amp. WORKS PERFECT. HOWEVER, if I plug the laptop into the inverter for a ps (instead of the battery) I get the same NASTY BUZZ as I mentioned before.

    Now what I defer from this all is the power inverter is bad...agree? What I dont get is why the fuzzy sound from the mp3box even when plugged into the house lead...could it be a bad inverter and ps?

    Opinions..

  2. #2
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    May 2000
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    Grounding problem, simply attach a wire between computer's power supply (I just hook it into one of the screws that are used to mount the supply to the case) and heavy metal (make sure it's exposed well, such as a bolt along a door or a seatbelt bolt). If that doesn't solve it, do a search in here (that is probably the most asked about question on this bulletin board).

  3. #3
    Maximum Bitrate
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    Dec 1999
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    Run a ground wire from your car to the chassis of the computer. I have been doing the same thing with my laptop, and I connected my ground wire to one of the mounting posts for the parallel port. Worked like a charm.
    KG6OQD
    www.americansandassociation.org

  4. #4
    Constant Bitrate
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    Grounding does not always work...

    I have tried grounding everything in my darn case and still get a slight buzz when nothing is playing at volume level 50 (max volume is 80).. you cant hear it with music playing but its kinda annoying between songs or when the music fades in/out.. minimal though.. but its still there.

    Ive tried using the 3 to 2 prong adapter, grounding the computer ground directly to the car instead of through the inverter (using the 3 to 2 prong adapter, then taking the wire from the third and taking it to car chassis).. Everything is grounded to same spot, all grounds are as short as possible, tried several grounding spots (tested with a multimeter to ensure that it grounds there).. got ticked off and took a drill and bolt and made my own grounding spot, still didnt get rid of buzz.. Im now thinking if i get a better sound card thatll probably fix it (im using a cheap generic 16bit 44khz sound card.. cd quality but probalby dont filter too good.... guess only thing left is to search for a good name brand soundcard that is also only 1.5" high (ya this soundcard is only 1 1/2" high! tiny sucker.. its ISA not PCI.....

    Anyways id say if you have power inverter grounded properly, and if you ground powersupply case to the same ground as inverter, and it still gives you buzzing, try a better soundcard.
    99 ram 5.9 turbo
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  5. #5
    Constant Bitrate
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    Get an inline ground loop isolator for your rca connections. That should do the trick! Also make sure your amps are grounded to the same spot as everything else.

  6. #6
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    I have a gloop inline. I think my problem is in the grounding. There is a ground screw on the amp is that a good spot to ground everything to?


  7. #7
    Variable Bitrate
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    ive got the same prob its grounded and ive got 2 inline ground loop isolators 1 between the puter and headunit 1 betrween the headunit and amp

    i still get a humm between songs and at low volume levels

    i was thinking of putting a power line noise filter in before the invertor

    cheers
    pcman
    donate to my team in the ****box rally all proceeds go to the cancer council http://www.everydayhero.com.au/dodgy_mechanics

  8. #8
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    Do you have a good sound card or a crappy one... Right now i have that ...the fuzz that occurs over silence or low volumes...I am connecting it to a ****ty sound card and having no line out.

    Does that sound right? I hope so b/c i am planning on getting a new sound card.


  9. #9
    Constant Bitrate
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    Try a braided grounding strap instead of regular wire from the case to one of the seat bolt-downs. And say a prayer (maybe it's demons!)


  10. #10
    Constant Bitrate blackpacu's Avatar
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    i currently have the same problem w/ my set up
    I have found the culprit not to be the ground(this does play a good deal into the noise you will hear if you have hte inverter and your amps grounded at the same spot), but the inverter it self. from what i gather the inverter i have(a cheap one) does not produce as clean AC current that you would get from your house.

    The few solutions to this problem is to get a better invertor, one that produces a true sine wave(most invertors produce a modified sine wave), a line conditionor, or a dc/dc psu.

    a pure sine wave invertor will run you over 100, so it is prob. your best bet to go w/ the dc/cd psu.

    I have tried hooking the ups up to the set up in order to clean the line up a little bit but unfortuantly the 2 that i have dont modify the sine wave. if you have a ups that does do this that may work at getting rid of the noise

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