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Thread: Any ideas on USB power source with no interference?

  1. #1
    Low Bitrate torres1708's Avatar
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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...

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
    MySQL Error soundman98's Avatar
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    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?

  4. #4
    Low Bitrate torres1708's Avatar
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    Quote 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.

  5. #5
    MySQL Error soundman98's Avatar
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    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.

  6. #6
    Low Bitrate torres1708's Avatar
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    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...

  7. #7
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    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
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    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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