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PC line out noise? andd amps

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  • PC line out noise? andd amps

    Hey ppl,

    So i wired up my system today for the first time. Anyway all is working fine except i am getting some crackling noise from the computer line out (headphone/speaker socket) and you can hear it in the speakers when the music is either off or turned down.

    However, when i plug my mp3 playing straight into my amp (in place of the computer) i get no noise at all.

    IS this a case for a usb sound card?

    MY other issue is that my system draws 33mA when the ignition is off, i've found this is due to my k500 monitor which i believe it uses to keep the clock time etc stored. Is this an ok amount? or am i just going to drain my battery!

    thanks!

    drummerian

  • #2
    Is your mp3 running off batteries? If it is, then you might have a ground loop problem. Buy a ground loop isolator, that should fix it.

    I would rewire the monitor to an acc line. That way it wont draw any power when the ignition is off.
    I told my psychiatrist that everyone hates me. He said I was being ridiculous - everyone hasn't met me yet .

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    • #3
      amps problem solved!

      anyway back to this, my mp3 was running from batteries, anddd another test i did was to plug my head phones directly to the pcs output. This produced a similar result to the amp! so i am sure the noise is cause by the pc.

      Everything in my system is grouded to the same place.

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      • #4
        any ideas anyone?

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        • #5
          How tight is your 3.5mm plug in the audio output of the pc? If that wiggles, it will crack. You could also recheck all of your wire connections. Maybe on is loose.
          I told my psychiatrist that everyone hates me. He said I was being ridiculous - everyone hasn't met me yet .

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          • #6
            have checked and it seems fine? the crackling seems to change when i press on my usb touchscreen and it changes when i remove the usb and vga cables from the pc

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            • #7
              Sounds like some sort of interference. What is powering the PC?
              My Nearly Complete Car:
              http://www.mp3car.com/vbulletin/show...ed-car-pc.html

              Micro Control Center... Control Your Car Across the Internet
              http://www.mp3car.com/fusion-brain/1...-internet.html

              Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
              http://paulfurtado.com/

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              • #8
                car battery

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                • #9
                  Closer to the PC than that... like what power supply?
                  My Nearly Complete Car:
                  http://www.mp3car.com/vbulletin/show...ed-car-pc.html

                  Micro Control Center... Control Your Car Across the Internet
                  http://www.mp3car.com/fusion-brain/1...-internet.html

                  Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
                  http://paulfurtado.com/

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                  • #10
                    m2-atx

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                    • #11
                      Grr I was hoping you would say you had an inverter. That would have been the easy answer to the noise.

                      How far away is the PC from the Amp?
                      My Nearly Complete Car:
                      http://www.mp3car.com/vbulletin/show...ed-car-pc.html

                      Micro Control Center... Control Your Car Across the Internet
                      http://www.mp3car.com/fusion-brain/1...-internet.html

                      Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
                      http://paulfurtado.com/

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                      • #12
                        40cm ish

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                        • #13
                          Grr... that part is irrelevant anyway since you said it does it with headphones too.

                          Is the sound card connected to a hub, or direct to the computer?

                          Is it powered directly by the computer's usb port?

                          Does its USB cable run by any power cables?

                          Have you tried it in different USB ports?
                          My Nearly Complete Car:
                          http://www.mp3car.com/vbulletin/show...ed-car-pc.html

                          Micro Control Center... Control Your Car Across the Internet
                          http://www.mp3car.com/fusion-brain/1...-internet.html

                          Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
                          http://paulfurtado.com/

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                          • #14
                            the sounds card is on the computer mainboard, i don't have an external one.....yet, i might have to get one if thats what people think will sovle the problem!

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                            • #15
                              What mobo are you running? Check all your ground connections, and keep them as short as possible. Ground your PC psu and the amp at the same place if you can. Is your mobo mounted on metal or something else. The mobo standoffs are an important ground.

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