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CarPC project, want to add multiple monitors, ok to use a VGA Y-Cable?

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  • CarPC project, want to add multiple monitors, ok to use a VGA Y-Cable?

    Just curious if I will get any real loss in quality. I have the CarPC in the trunk, and I'm running a 15 foot VGA cable to the dash for a 5" LCD.

    Eventually, I plan on adding a couple more 5" LCD's to each of the head rests for people in the back seat.

    Just curious if my quality will degrade way too much if I split the cable between 3 monitors with all that length...

    they will be running 800x600 interlaced resolution, so I assume it won't be a problem.

    Thanks for any info

  • #2
    I won't suggest it. I've used such a cable in the past. It DID work, however I lost a bunch of brightness on both displays.

    And if you're planning for further upgrades, I suggest a dedicated splitter. They can be found for like $35 or so, 1 port in, 4 port out. I use one @ work (computer shop) to display 1 pc on 4 screens.
    My Opel Astra 1993 CarPC: http://www.djsmiley.com/projects/carpc/photos/

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    • #3
      Yep agree with Smiley, someone else the other day wanted to do the same. Look for the thread if you want. You will lose alot of brightness.
      Its down!!!! Sold the Golf so took it out, it's still alive but not installed.

      Progress [-----------] 0%
      Who the Daddy Iz!

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      • #4
        i have 2 vga screens in my system and yes you do loose brightness with a y cable . what i did was buy a vga splitter. it say 9 volts but i'm running it right off the battery and so far so good. i don't know the specs for the unit but the guy i got it from said it was good for 12v.

        and you should get a bunch of tft lcd's for your headrests. use a tv out video card and you're all set. i have 4 screens and i also have a video distribution amp for these. each output is also adjustable for signal strenght too. cost about $25 on ebay
        99.9% complete.

        http://www.cardomain.com/ride/212327

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        • #5
          that's some good info, I found some VGA splitter boxes on ebay. The ones I looked at also run off of a 9v 500mA AC adapter ... so I assume they would be able to run off of the car's 12v? would that cause any problems? Should I run it off of my opus 150W PSU or straight off the car's power?

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          • #6
            By car's power you mean ACC right? I'm no electronics guru, but anything hooked up to constant power will draw on your battery, even if a signal isnt going through your VGA splitter at the time.
            '03 Acura TL PC FINISHED!!
            MP3CAR

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            • #7
              yes i mean accessory. that kinda goes without saying. what i really meant was that its marked 9v. so i think by using 12v you may wear out the parts faster by using more voltage. someone help me here...

              i do have quite a few hours on the unit so far and it works fine. i am using 2 monitors with it.
              99.9% complete.

              http://www.cardomain.com/ride/212327

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              • #8
                Originally posted by mattress
                that's some good info, I found some VGA splitter boxes on ebay. The ones I looked at also run off of a 9v 500mA AC adapter ... so I assume they would be able to run off of the car's 12v? would that cause any problems? Should I run it off of my opus 150W PSU or straight off the car's power?
                Yes, that will cause a problem. Feeding to much voltage into a circuit is not a good idea. Like plugging a 110 appliance into a 210 European plug. Not good.

                You can either build your own supply for it using something like an LM7809 voltage regulator, or purchasing an adjustable voltage regulator designed for a cigarette lighter, and hacking it for your purposes.

                Michael
                ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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                • #9
                  Originally posted by albysure
                  yes i mean accessory. that kinda goes without saying. what i really meant was that its marked 9v. so i think by using 12v you may wear out the parts faster by using more voltage. someone help me here...

                  i do have quite a few hours on the unit so far and it works fine. i am using 2 monitors with it.
                  If it is not designed for 12 volts, or at least have tolerances for 12 volts, then you will fry the unit. While 3 volt isn't much, it will probably fry it. If yours is working, then it might still be in tolerance. If that is the case, then you shouldn't have a reduction in life.

                  Your experience makes me believe that it was designed for 12 volts, but they decided to run it on 9 volts for some reason, perhaps because the 9volt PS/power cube was cheaper or something like that.

                  Michael
                  ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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