Not sure where to post this, VGA to Composite...

[Pogo708]

I'm trying to hook my computer up to my TV. Is it possible to make a VGA to Composite adapter? I know you can buy 'em, but I'd rather just make it myself.

[SpongeBuell]

I do not believe so, and it would not be easy if you can, due to frequencies and the whatnot. There are, however, video cards that output tv and VGA simultaneously, you could probably get one for under $50

[gannon]

I would more or less recommend software hacking for this. Some video cards can be forced to output 15hz rgb with a special program

[Sparkfist]

You cant change VGA (even if you could it would require a lot of work and not be worth it), you want to use a tv as a monitor you need a video card that alouse you to export through a tv out (like what the cable line goes it). Thats really the only way, and so you know tvs suck as monitors (unless its an lcd) the images come out blurry.

[gannon]

I did some snooping on google, and PowerStrip 3.30 is the program that will allow you to output custom scan rates and resolutions from your vga card. You'd then either need to use a 15hz rgb tv/lcd, or use a chroma encoder to get composite video.

[JackFrost22]

I built an adapter and it works fine.

[Pogo708]

I built an adapter and it works fine.

Um... Could you tell me how?

[JackFrost22]

I found plan somewhere i think...............its in forum 42 under "electronics projets"

[HK-47]

[gannon]

I have also seen people combine the hsync and vsync directly instead of through that circuit. Supposedly it works as well, but not as good as that circuit.

[Gamelver]

hmmmmmm I think I might try that on my mom's (broken) laptop. The lcd screen is cracked so I was going to try and hook it up to a normal VGA monitor (I would have this downstairs in my basement, where I work on portables, so that I could be on here AND soldering!!!!!!!!), but now I was thinking of maybe just using composite and hooking it up to my tv.......how would I find the hsync and vsync lines, though?
any help would be much appreciated ......

[SpongeBuell]

from the hardware bible:

Code: Select all

<table border="1">
    <tr>
        <td>Pin</td>
        <td>Name</td>
        <td>Dir</td>
        <td>Description</td>
    </tr>
    <tr>
        <td>1</td>
        <td>RED</td>
        <td><img src="images/arrowr.gif" alt="-->" width="32"
        height="9"></td>
        <td>Red Video (75 ohm, 0.7 V p-p)</td>
    </tr>
    <tr>
        <td>2</td>
        <td>GREEN</td>
        <td><img src="images/arrowr.gif" alt="-->" width="32"
        height="9"></td>
        <td>Green Video (75 ohm, 0.7 V p-p)</td>
    </tr>
    <tr>
        <td>3</td>
        <td>BLUE</td>
        <td><img src="images/arrowr.gif" alt="-->" width="32"
        height="9"></td>
        <td>Blue Video (75 ohm, 0.7 V p-p)</td>
    </tr>
    <tr>

        <td>4</td>
        <td>ID2</td>
        <td><img src="images/arrowl.gif" alt="<--" width="32"
        height="9"></td>
        <td>Monitor ID Bit 2</td>
    </tr>
    <tr>
        <td>5</td>

        <td>GND</td>
        <td><img src="images/arrow.gif" alt="---" width="32"
        height="9"></td>
        <td>Ground</td>
    </tr>
    <tr>
        <td>6</td>
        <td>RGND</td>

        <td><img src="images/arrow.gif" alt="---" width="32"
        height="9"></td>
        <td>Red Ground</td>
    </tr>
    <tr>
        <td>7</td>
        <td>GGND</td>
        <td><img src="images/arrow.gif" alt="---" width="32"
        height="9"></td>

        <td>Green Ground</td>
    </tr>
    <tr>
        <td>8</td>
        <td>BGND</td>
        <td><img src="images/arrow.gif" alt="---" width="32"
        height="9"></td>
        <td>Blue Ground</td>

    </tr>
    <tr>
        <td>9</td>
        <td>KEY</td>
        <td>-</td>
        <td>Key (No pin)</td>
    </tr>

    <tr>
        <td>10</td>
        <td>SGND</td>
        <td><img src="images/arrow.gif" alt="---" width="32"
        height="9"></td>
        <td>Sync Ground</td>
    </tr>
    <tr>

        <td>11</td>
        <td>ID0</td>
        <td><img src="images/arrowl.gif" alt="<--" width="32"
        height="9"></td>
        <td>Monitor ID Bit 0</td>
    </tr>
    <tr>
        <td>12</td>

        <td>ID1 or SDA</td>
        <td><img src="images/arrowl.gif" alt="<--" width="32"
        height="9"></td>
        <td>Monitor ID Bit 1</td>
    </tr>
    <tr>
        <td>13</td>
        <td>HSYNC or CSYNC</td>

        <td><img src="images/arrowr.gif" alt="-->" width="32"
        height="9"></td>
        <td>Horizontal Sync (or Composite Sync)</td>
    </tr>
    <tr>
        <td>14</td>
        <td>VSYNC</td>
        <td><img src="images/arrowr.gif" alt="-->" width="32"
        height="9"></td>

        <td>Vertical Sync</td>
    </tr>
    <tr>
        <td>15</td>
        <td>ID3 or SCL</td>
        <td><img src="images/arrowl.gif" alt="<--" width="32"
        height="9"></td>
        <td>Monitor ID Bit 3</td>

    </tr>
</table>

for some reason it won't let me use HTML, so copy that into notepad, save it as an HTML, and open it with your web browser. If a mod can edit this to make it right, that would be reat

[JackFrost22]

I never thought of that way. Cool Idea Gannon.

[gannon]

[Gamelver]

no picture is coming up..........
Edit: works fine now, I'll go and try connecting the laptop to my tv in a little bit.