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Any ideas on USB power source with no interference?

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  • Any ideas on USB power source with no interference?

    I'm using my iPad in the truck to output video to 2 headrest monitors. The problem is that the screens display wavy lines when the USB is connected to truck USB power adapter. When I connect the USB cable to a wall outlet, the wavy lines disappear. Is there some type of filtered USB power adapter out there so that I can fix my video problem? Any hep would be appreciated...
    Motorized iPad 2 installed in Silverado

  • #2
    Have you looked in the store?
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-016.htm
    or
    http://store.mp3car.com/DC_Powered_4..._p/adt-015.htm
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

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    • #3
      while the power supplies darque posted might do it, the lack of detail is preventing me from also recommending them to correct the problems.

      which usb port? your truck has one as part of the factory equipment?
      or is it something to do with a aftermarket adapter that powers the ipad?
      is the ipad pulling power from a different area as the usb port?
      what kind of screens are they?
      how are you powering the usb port from a wall outlet?
      My OLD 2001 Mitsubishi Eclipse GT:
      "The Project That Never Ended, until it did"


      next project? subaru brz
      carpc undecided

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      • #4
        Originally posted by soundman98 View Post
        while the power supplies darque posted might do it, the lack of detail is preventing me from also recommending them to correct the problems.

        which usb port? your truck has one as part of the factory equipment?
        or is it something to do with a aftermarket adapter that powers the ipad?
        is the ipad pulling power from a different area as the usb port?
        what kind of screens are they?
        how are you powering the usb port from a wall outlet?
        I'm using a lighter adapter that has a USB input since my truck doesn't have one stock. I'm using the apple composite cable that has the USB connector. In order to isolate the problem, I took the USB from the composite cable and connected it to the lighter adapter and got wavy lines on screen. I then took the USB cable and connected it to the wall plug that comes with the iPad and used an extension cable to get it to reach the truck and the video signal was clear. So I know it's the power source and just need to find an alternative with cleaner feed or maybe the lighter adapter I'm using is sending too many amps causing the interference.
        Motorized iPad 2 installed in Silverado

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        • #5
          my non-existant teacher side is kicking in...

          there is no such thing as "sending too much amps". though it is possible that it might not be providing sufficient power for the devices though

          a ampere is a measure of the amount of volume of electricity flowing to a device.
          a volt is a measure of the pressure of electricity flowing to a device.

          if you have a 2" water pipe, and a 20" water pipe, both with a max constant pressure of 12psi (like a 12 volt electrical circuit) the 20" pipe will have a larger volume of water coming out of it.

          no device can have more amps pushed into it then it requires--electrical devices are like a waterpump--on the previously mentioned pipes, it can only draw as much as the pipe can supply-- there is no force on the other end of the pipe pushing water into the pump, and so therefore, no way to get more pressure in the pipe then what the waterpump(device) requires.



          as you said, it is the power source causing the problem, and so a good viable solution would be to run new power wire for the cig. lighter adapter, and while your at it, run a good ground wire to a appropriate location. cig. lighter ports are notorious for having poor, or insufficient grounds for electrical devices..

          in this case, the first link that darque provided could be a good alternative once you run a dedicated power wire, and determine that it is in fact the adapter causing the problem.
          My OLD 2001 Mitsubishi Eclipse GT:
          "The Project That Never Ended, until it did"


          next project? subaru brz
          carpc undecided

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          • #6
            It turned out that the current plug was sending 1 amp, so I bought a 2 amp adapter and it works fine. Thanks for the help...
            Motorized iPad 2 installed in Silverado

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            • #7
              this is a funny one:

              As an analogy, imagine you are driving to the superbowl in your
              car. There are tens of thousands of other people out on the road
              too, heading in the same direction for the same reason. The "Voltage"
              here is the desire of all these people to get to the stadium.
              The "current" is the speed with which they are getting there,
              which could be pretty small if traffic was really bad...
              -Thanks
              Mitch
              www.rush2112.net

              "Did you test it in carwings??"

              Sun, Come shine my way
              May healing waters bury all my pain
              Wind, Carry me home
              The fabric of reality is tearing apart
              The piece of me that died
              Will return To live again

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