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PLS Help, Spent 2000 now in PSU trouble

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  • PLS Help, Spent 2000 now in PSU trouble

    Hi,
    I spent over 2g's for my car sytem, i have a MSI mega pc 651 and a pentium 4 with the stock PSU, and i am runninga 600w modified sine power inverter, and it makes that buzz noise when connected to my pioneer head unit through the aux. My quiestion is that is there a way that i can eliminate that noise, eg. get a filter and connect that to the inverter and then connect to the pc's PSU. PLEASE , ANSWERS ARE VERY URGENTLY NEEDED. I need a solution. I cant afford to fork out for a another power invertor or a car PSU. PLEAASE HELP!

  • #2
    ground your computer's PSU to the same point your ground your inverter. this has been covered 10000 times. Make sure the grounds are no more then 1 foot long
    '98 Explorer Sport
    http://mp3car.zcentric.com (down atm)
    AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
    80% done

    Comment


    • #3
      How?

      I havent grounded my inverter, i just conncected it to the battery, + and -. So how should i ground, also you do realise this is a modified sine wave.

      Thanks

      Comment


      • #4
        The -ve terminal on your battery is your ground.

        You'll need to find a grounding point close to your inverter and PSU and run the -ve wires from both to that point. This will be the black wire from your inverter and probably the blue wire from your PC plug. Make sure you have an inline 5amp fuse between your inverter and battery in case you make a short circuit.

        Although how on earth do you spend 2k. Next time you need one, let me know, and I'll build it for 1800 !

        Comment


        • #5
          grounding back to the battery is not a good idea.. its not a good ground. A good ground should be under a foot. Find a screw into your car frame and run the ground from the inverter to that screw.. then make a grounding wire using like a oring connector from a screw that holds the PSU to the case and ground that to the same spot. That should clean up most if not all the noise

          good luck
          '98 Explorer Sport
          http://mp3car.zcentric.com (down atm)
          AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
          80% done

          Comment


          • #6
            Thanks

            Thanks hijinx and matt, i will try your ideas and also can you just reassure me that this will work 100% and the modified sine wave is not the problem, because my mate is offering me a true sine wave inverter i just want to make sure that there will be no probs, also in my inverters troubleshooting guide it says that buzzing noise comes if your audio equipments PSU doesnt adequetly filter sine waves. But i trust you guys more than the book so just confirm this with me. Also the buzzing is also hissing as well but the music plays in the background?

            Comment


            • #7
              ya thats normal grounding issue noise. I used a crappy $30 inverter. It had to have been a modified sine wave. If I didn't ground the PSU to the same spot as the inverter I'd get noise.. as soon as i grounded it went away. give it a try.. it should fix the problem.
              '98 Explorer Sport
              http://mp3car.zcentric.com (down atm)
              AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
              80% done

              Comment


              • #8
                Thanks

                Awsome, ill go try it now and come backk an tell you the results, also it the ground from the black wire for the inverter or the red?

                Comment


                • #9
                  the red is the live 12v.. black is ground.. so ground the black wire to the frame of the car somewhere.. and then make a grounding wire so you can attach it to the screw on the case that holds in the PSU and ground that to the same spot
                  '98 Explorer Sport
                  http://mp3car.zcentric.com (down atm)
                  AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
                  80% done

                  Comment


                  • #10
                    Still trouble?

                    ok, i have done as you said but when i ground the 2 wires, it still makes the hum noise, but when i touch the grounds together and not put it on the chassis of the car, the hum gets reduced hugely, but still there is some, so how do i improve? BTW i have made the Aux cable myself, it is a pioneer head unit and i used a old cd changer cable, so if i buy a proper aux cable , would this help?

                    Comment


                    • #11
                      you have to ground those two wires to the same spot.. which basically means touching each other. yes a good aux cable would help also
                      '98 Explorer Sport
                      http://mp3car.zcentric.com (down atm)
                      AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
                      80% done

                      Comment


                      • #12
                        Re

                        MY aux cable should be coming tommorrow so ill let you know, also i think i made the ground cable from the inverter too long, also, it doest seem to make a diff if i touch the car body, it only makes a diff if i touch the 2 grounds together.

                        Thanks

                        Comment


                        • #13
                          here's the thing...

                          you ground the inverter to the frame.. you'd like it to be under a foot.. THEN ground the PSU to that SAME spot as the inverter.. so they are touching at the same spot on the car frame. you are using like the same screw on the frame to ground both the inverter and PSU
                          '98 Explorer Sport
                          http://mp3car.zcentric.com (down atm)
                          AMD 800mhz 192megs RAM 60gig hard drive 9 inch widescreen VGA
                          80% done

                          Comment


                          • #14
                            I also found a ground loop isolator can help you trouble shoot where the noise is coming from and which one of your grounds is bad. I had an evil buzz in my system till I followed the advice given in these forums, listen to the man with the stapler.

                            Grounds are super important, I was lazy on my inital install and grounded things everywhere, spent about a month on and off troubleshooting. My system had several problems, PSU not grounded, inverter grounded to battery, 2 amps grounded in different locations.

                            Comment


                            • #15
                              Thanks but still!

                              Hi,
                              I have eliminated most of the noise but still need a better ground which i have found, and thanks alot for your advice. The thing i am worried abbout is that a man from maplins told me that using a modified sine inverter damages the computer PSU and will blow it, supposedley it damages the capacitator. Is this guy talkin ***** or telling the truth. He demostared or the square waves damaged it? So is this true?

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