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  • Engine noise with M2-atx

    well i finally changed my inverter setup to and m2-atx, but this brought a couple issues, so here we go:

    my first issue is noise, with the engine running engine (alternator) noise that annoying humm, with the engine off i get hard drive noise, it crackles at the same time as the hard drive reads because i can hear the hard drive read and the speakers crackle at the same time.

    so knowing this i read bugbytes FAQ, and made sure that my grounding point to the m2 was nice and clean, and i also grounded the case to another point in the chasis, and in the mist of me doing this i first hooked up the ground to the case and lo and behold the pc started, so i proceeded to plug in the ground to the m2 and the noise is still there.

    now here is the funny part as i was cleaning my grounding points (with both of them unplugged so neither the case nor the m2 had a ground) i accidentally hit the power button to the pc and the thing started without ground! i remembered from bugbytes guide that the pc tries to ground through the speakers so i proceeded to unplug the head phone jack and the pc shut off, so i know what the issue is now.

    i also checked resistance at my grounding points and i had zero resistance according to my multimeter so for some reason my pc prefers to ground through the speakers and not the nice clean grounds that is has.

    i know i might need a ground loop isolator to get rid of the noise, i don't want to use one because it's not a real solution but i already have good grounds and i don't know what to do.

    and finally will i need an alternator suppressor as well or will the ground noise isolator take care of both noises.
    Scion CarPC

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  • #2
    come on someone's gotta know this?
    Scion CarPC

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    • #3
      Originally posted by Injector View Post
      and i also grounded the case to another point in the chasis,
      Ground loops can be caused by grounding to different points. Is your radio ground to yet another point on the car?

      Best advice I can offer is to ground everything to the same point.
      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.
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      • #4
        it's the stock radio grounded by the factory.

        funny things is that before when i had an inverter i had no sound issues.
        Scion CarPC

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        • #5
          oh and i unplugged the 3.5mm plug from the pc and plugged it into my laptop to see if it was RF and i had no interference just clean sound
          Scion CarPC

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          How to speed up boot with buried features in msconfig

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          • #6
            Right, so when you plugged it into a battery operated device that shares no electrical circuitry with the car, it has no noise. When you plug it into a device that does share with the car, you get noise.

            Try grounding your computer and your M2 to the factory ground for the radio. It sounds like you have each device (M2, case, radio) grounded to separate points. That makes it possible to introduce a ground loop from varying paths of resistance as the negative returns to the battery.

            I'll bet if you power the PC from a PSU that plugs into the wall, you won't get any noise either. You might try that and see whether it's true or not. That would tell you that the ground loop is from the ground points.
            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:
            -Find out about the new iBug iPad install?
            -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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            • #7
              Try a SoundBlaster External USB card instead the onboard sound card from the mainboard. I had seen the noise issue on onboard cards quite too often...
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              • #8
                what did you tap into get you power. Fuse panel areas causes alot of noise issues. It best when you get straight from the battery then tapping into a power such as the radio.

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                • #9
                  Originally posted by Bugbyte View Post
                  Right, so when you plugged it into a battery operated device that shares no electrical circuitry with the car, it has no noise. When you plug it into a device that does share with the car, you get noise.

                  Try grounding your computer and your M2 to the factory ground for the radio. It sounds like you have each device (M2, case, radio) grounded to separate points. That makes it possible to introduce a ground loop from varying paths of resistance as the negative returns to the battery.

                  I'll bet if you power the PC from a PSU that plugs into the wall, you won't get any noise either. You might try that and see whether it's true or not. That would tell you that the ground loop is from the ground points.
                  i tried grounding to the same grounding point as the radio and nothing the noise is still there, i'm abour to rip my hair out
                  Scion CarPC

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                  • #10
                    Originally posted by maxq668 View Post
                    Try a SoundBlaster External USB card instead the onboard sound card from the mainboard. I had seen the noise issue on onboard cards quite too often...
                    i would if i had one, i'll ask my friends see if someone has one
                    Scion CarPC

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                    How to speed up boot with buried features in msconfig

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                    • #11
                      Originally posted by ggcr View Post
                      what did you tap into get you power. Fuse panel areas causes alot of noise issues. It best when you get straight from the battery then tapping into a power such as the radio.
                      i didn't tap into anything, i used an amplifier kit to wire the pc, so BATT+ comes all the way fused from the battery.
                      Scion CarPC

                      Bluetooth Audio Gateway Tutorial

                      How to speed up boot with buried features in msconfig

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                      • #12
                        Thats good. It must be the wire coming out of the computer to the back of the headunit. did you run line out wire with your power? if so try running it a different route away from that power wire. did you have a aux on the headunit or you used a hi-low converter? Also the quality of the wires you use will be a big factor. The cheap ones tend allow radiant noise. They are not shielded as well as the higher priced one. Let me know how it turns out.

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                        • #13
                          Originally posted by ggcr View Post
                          Thats good. It must be the wire coming out of the computer to the back of the headunit. did you run line out wire with your power? if so try running it a different route away from that power wire. did you have a aux on the headunit or you used a hi-low converter? Also the quality of the wires you use will be a big factor. The cheap ones tend allow radiant noise. They are not shielded as well as the higher priced one. Let me know how it turns out.
                          it's a line out cable to the aux port on my head unit, but the power cable runs on the passenger side, data lines run on the driver side and the audio cable runs by itself on the middle (aux port is inside my armrest/console) also if it was RF it would have made the noise when i plugged in my laptop, but it didn't.
                          Scion CarPC

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                          How to speed up boot with buried features in msconfig

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                          • #14
                            Re-reading your original post, I was just curious how the music sounds if you just let it ground through the radio. Does it still make noise?

                            A couple of other questions - any noise when the car is off or only when it is running?

                            Also, unplug the lineout and listen to it through headphones. Any noise?

                            I think you may be down to either a ground loop isolator or trying a USB sound card. I'd go with the soundcard if audio quality is important to you. Some people have reported success with them and others claim it clips some of the frequencies.
                            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:
                            -Find out about the new iBug iPad install?
                            -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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                            • #15
                              Originally posted by Bugbyte View Post
                              Re-reading your original post, I was just curious how the music sounds if you just let it ground through the radio. Does it still make noise?
                              you mean if i unplug all the grounds and just leave the headphone jack plugged in?

                              A couple of other questions - any noise when the car is off or only when it is running?
                              when the engine is off i have hard drive noise, it crackles when the hard drive head moves, with the engine running i get hard drive noise and alternator whine
                              Also, unplug the lineout and listen to it through headphones. Any noise?
                              great minds thinks alike because i tried this already, i tried it straight from the pc and at the end of the extension cable, i could not hear the noise but i think it was because the volume was too low, or because with the headphones not grounded the electricity has no path to flow
                              Scion CarPC

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