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Car PC lots of "noise", good USB attached sound?

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  • Car PC lots of "noise", good USB attached sound?

    hi guys,
    new here, usually on fiatforum, but there ICE section just doesnt have the expertise.

    my problem:
    when i plug amplifier in via the 3.5mm jack on the motherboard, it generates TERRIBLE noise.....even with ground loop isolator (dont like using them anyway, they just "mask" the problem)

    so i bought a creative x-fi usb audio, this worked with a dramatic improvement reguaring noise. but it has lots of problems with windows and reusming form hibernate.

    anyone have any gems of wisdom to help me out here??
    thanks

  • #2
    One of the most popular sound boards I've seen used is the audigy.
    Originally posted by ghettocruzer
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
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    • #3
      could youy elaborate a lil?

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      • #4
        Have you merged the ground planes? Meaning, is the motherboard grounded to the vehicle chassis directly? In my experience this will help tremendously to mitigate a ground loop and other noise problems.
        98' Honda CR-V
        http://www.superbluecrv.com

        *OBDMPG, the RR OBD Plugin*

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        • #5
          no i havnt, when i tried this before, the motherboard sparked, smoked and died....whats the safest way to do it? as this sounds like the most logical step....

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          • #6
            Also, try flipping the ground loop isolator in the other direction.

            How is your car's audio setup? Do you use a head unit? Do you have any amps?

            How is the computer powered? Are you using a power inverter? A dc-dc power supply?

            Is there an inverter in your car at all?

            Originally posted by mzhussein View Post
            no i havnt, when i tried this before, the motherboard sparked, smoked and died....whats the safest way to do it? as this sounds like the most logical step....
            How did you ground it last time?
            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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            • #7
              i dont think flipping the ground loop isolator will make a difference, due to its design, (its essentially 2 coils, side by side, so what ever way it is, it will be the same, unless its broken) also mine only connect one way.

              i go from car pc straight via 3.5mm jack, to delta box, then to 2 amps with 3 channels (front, rear, sub) thats how it is at the moment. no headunit.

              power comes from M1-atx/M2-atx (not sure, it came with a job lot of stuff i bought as an unfinished project, and is the of the only surviving original bits) supply, no inverters.

              last time when i tried to ground it (dont laugh) i wound a wire round one of the screws holding the motherboard down, so it was making contact with the little metal ring round the screw holes, then connected this to chassis.

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              • #8
                Originally posted by mzhussein View Post
                last time when i tried to ground it (dont laugh) i wound a wire round one of the screws holding the motherboard down, so it was making contact with the little metal ring round the screw holes, then connected this to chassis.
                That's an acceptable way to do it, although you should use a spade or ring connector to provide a safer connection.

                Then just connect the other end of the wire to a solid ground point on the chassis, even better would be the same point the power supply uses for ground.

                Just make sure to do everything with the computer off and the power supply disconnected from the battery.
                98' Honda CR-V
                http://www.superbluecrv.com

                *OBDMPG, the RR OBD Plugin*

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                • #9
                  i did it with it on, because i was probing to see if it made better/worse, like at the opticians with lenses.....

                  possibly not the best idea...

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                  • #10
                    What motherboard are you using? is it with VIA chipset?

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                    • #11
                      yes it is

                      FYI i had a crash in the UK ice recently so got to fix that first before i can continue with the carpc.....will be back here after the cars fixed tho

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                      • #12
                        USB problems with VIA chipsets is very wellknown.
                        You have to install the VIA USB driver, instead of Windows integrated USB driver.
                        Even though Windows claims that it's own driver is better, use the "older" VIA driver.
                        It's on the cd-rom for the motherboard...

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                        • #13
                          i will try that when the weather thaws out a bit...and when my car situation is a little more positive, but many thanks for that heads up.

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                          • #14
                            You're welcome. Please give a reply when you have tried..

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                            • #15
                              ok guys, it loooks like i should be getting my car back tomorrow after 6 weeks in repair!!! pockets will be 1k lighter

                              buuut id still like to sort the car pc problems....

                              so to be clear as i havnt been on here in a bit, i should ground the car PC to the chassis, and install VIA usb chipset drivers.

                              a few Q's where od i get hold of the VIA drivers? and will splicing the motherboard-PSU ground cable with a cable bolted to the chassis be ok?

                              also there is scrolling interferance on my 8" touchscreen, but ONLY when its in the car, not when it isnt, what noob mistakes am i likely to have made to cause this?

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