Graphics VGA To Y, B-Y, R-Y converter

Discussion in 'Hardware' started by Wolfe, 31 Dec 2004.

  1. Wolfe

    Wolfe What's a Dremel?

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    I Know that a VGA cable can be broken down into 5 coaxial cables. Is there any simple way to convert this into component video. ATI Makes a small adapter dongle(http://www.newegg.com/app/viewProductDesc.asp?description=14-999-204&depa=0), and judging by the size it can't be extremely complicated. I do have some small experience with building electronics, but i haven't been able to find any pertinent information about how a VGA Connector breaks as far as the signal goes.

    For example, I know you can make a crude converter to go from s-video to composite using two small caps. It it similar?
     
  2. star882

    star882 What's a Dremel?

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    VGA (RGB) is component. If you want 3 lines, then it's sync-on-green and is relatively easy to do. Use a PIC to combine the syncs, then use high speed opamps to merge the syncs with the green.
     
  3. Wolfe

    Wolfe What's a Dremel?

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    Could you be more in-depth? I've looked at PICs, bit i haven't learned assembler yet. Could it be done with something like a Basic STAMP (i have one lying around)? Also, do you have any examples?

    Also, if you look at the converter at http://www.newegg.com/app/viewProductDesc.asp?description=14-999-204&depa=0, there's no real way they could have crammed all those electronics into that adapter, for that price. Coud my Video card (radeon 9600) be capable of outputting sync-on-green natively? Does anyone know anything about this adapter?
     
    Last edited: 2 Jan 2005
  4. star882

    star882 What's a Dremel?

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    PICs are very cheap, and so are opamps. SMD technology allows electronics to get really tiny.
    Of course, if your video card can output composite sync, you can skip the PIC.
    IIRC, all the opamp needs to do is, when the sync line is inactive, linear shift the normal 0-0.7v of the signal to 0.3-0.7v, and output 0v when the sync line is active.

    But what are trying to do in the first place? Run an old workstation monitor on your PC? Then it'll be more than hardware. You'll need to edit the config files.
    http://www.linux.org/docs/ldp/howto/XFree86-Video-Timings-HOWTO/index.html
     
  5. MR BUNGLE

    MR BUNGLE Shoddymodder

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