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Thread: Making the RGB signal stronger?

  1. #131
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    Well, I can see how this may work, but I am wondering: Do I still set the monitor software up the same way?

    Also, I want to make VGA boxes for my game systems. Can the opposite of this circuit, RGB to VGA, be designed? It would require the splitting of horizontal and vertical sync, I believe.

    Edit: I found out how to split the signal, but I still need to find a way to boost horizontai sync from 15KHz to 31KHz. Is there a circuit for this?

    Edit again: Okay, I now know that what I need is a scan doubler. Any schematics out there for it?

    I found this: http://212.57.231.17/datasheetarchiv...ic/DS49202.pdf
    does anyone have anymore data on this(like cost), and can anyone make sense of the inputs and outputs? It is kind of confusing the terms they use. I must find a scan doubler....this AL251 seems to be the best option I've found. http://www.averlogic.com/video_converter/AL251.html is the site for it.

    Edit #5: I think this is a complete NTSC to PAL circuit chip, but I really just need a scan doubler. If there is a schematic anyone can find please tell me about that, too.

  2. #132
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    Sorry about the dbl post, but I guess the only way this may be noticed is an increase in the # of posts, and not another edit. Anyway, in addition to the questions and stuff above, I managed to get one of my video cards down from 29Khz HSync to 17KHz Hsync. Is this enough for the RGB mod? I ask because it is close to 15KHz, but not quite. It is on 640x480 Arcade setting.

  3. #133
    MySQL Error MatrixPC's Avatar
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    Quote Originally Posted by MM007
    Sorry about the dbl post, but I guess the only way this may be noticed is an increase in the # of posts, and not another edit. Anyway, in addition to the questions and stuff above, I managed to get one of my video cards down from 29Khz HSync to 17KHz Hsync. Is this enough for the RGB mod? I ask because it is close to 15KHz, but not quite. It is on 640x480 Arcade setting.
    Download PowerStrip and try if the videocard alow you to pick custom resolution 640x480 Arcade
    If it does, you are ready to mod.
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  4. #134
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    It did. That's how I got the HSync down to 17KHz. Before, it WOULD go to 640x480 arcade, but was stuck on 29KHz HSync. I guess it'll work then. Now I just need a Playstation Multiout plug....

    Next up, I was looking through my stuff, and found an old 8-bit ISA card from 1991 that converts VGA to NTSC while allowing VGA output to still work. It seems to work with SVGA(the passthrough to the VGA port), but the software for it is so old, I dunno if I can get it to work on modern systems. It is so old, not only did it come with a 5.25" floppy as well as a Single Density 3.5" version, but the thing isn't even surface mount.

    It only has 3 chips in it. The HD440072 1L 13(a MOS/CMOS-type is my guess, it has 28 pins), a MC1377P QHXB9004, which is a 20 pin, and a 74HC04N, which I am having trouble remembering what it is. It may either be a quad AND, a quad NAND, or a quad inverter IC. I lean toward the latter two for some reason. Other than that, I see four 3904 transistors, some resistors, some electrolytic, ceramic, and mica(?) capacitors, a pair of jumpers, and a single two-pin clock crystal labeled "BOMAR". Another interesting thing: the ISA connector only has 5 connections on it.

    If anyone wants the software to look at, be my guest. Tell me where to send it. It seems to be DOS-based. I tried using PowerStrip to do something with it, but it didn't work.

    If anyone wants to hack it(all the files, only 316KB total, though most aren't even VGA to NTSC files. It all fits on a single density 3.5"), be my guest. Most of the files seem to be supplemental, and the VGA to NTSC file is only 32KB. It has multiple settings for which video cards to work with(all from the old days), so it may be possible to determine the overall changes made in each case, and make a plan to reach the end result on a computer of today, esp. with the standardization of Plug N Play. ^^

    If anyone is willing to take a look and help figure out what needs done, please tell me, ok?

  5. #135
    Variable Bitrate danon's Avatar
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    Quote Originally Posted by azcowboy
    BTW. Has anyone tried connecting a touchscreen to one of these monitors. I haven't seen a touchscreen system for a screen 5 inches. Only 5.4 inches

    5", 5.1" and 5.4" are all the same, it is because the actual size of the screen is 5.6" but viewable at 5" or 5.1" depends on who is reffering it to. manufacturers started refering to the size of the monitor based on the actual viewable size some years back for fear of having to spend millions to change the product packaging when one buyer complained.

    having said that, it is better to check the exact size (height/width) of the screen itself from its specs. since you can use a touchscreen bigger that the screen itself, but not vise versa.


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  6. #136
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    Great news! I've been looking for a chip that will cut the frequency in half for videocards that aren't capable of the 15KHz HSync. I believe I have found one, a J-K Flip Flop. By connecting the HSync input to the J input, and hooking the Q to HSync output, you should be able to reduce frequency from 30KHz to 15KHz. I still think powerstrip should be used for centering and stuff, but this could allow all SVGA video cards to work with RGB, instead of the 15KHz ones. I have yet to test the J-K flip-flops at such high frequencies, though. I think they can handle about 15MHz, but I could be wrong.

  7. #137
    Raw Wave Rob Withey's Avatar
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    Bad news. What you are proposing probably won't work. The color information is still being output on the RGB pins at a 30kHz scan line frequency, so at best you'll end up with 2 side by side images (with the front porch of the second image in the centre of the screen). You'll also still have to deal with an out of range VSync frequency.

    Generally these monitors are expecting an interlaced signal, not progressive scan - how do you propose to solve that one?

    There is a reason why scan converters are so expensive. It is because the contain a bit more than a flip flop. The need to sample and replay an entire frame generally.
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  8. #138
    FLAC mbkowns's Avatar
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    This is what I will do with my RX8 You got to look up (www.extron.com) products on ebay. They have exactly what your looking for.
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  9. #139
    FLAC mbkowns's Avatar
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    Also i was thinking about it make sure your using the right size wire. I was just going to buy a BNC cable and snipe the ends and use the right solder to tap into my navigation.
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  10. #140
    Constant Bitrate cafn8's Avatar
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    Quote Originally Posted by Rob Withey
    ...at best you'll end up with 2 side by side images (with the front porch of the second image in the centre of the screen)...
    Oh, that sounds familiar.

    Would you say a different video card is in order for me then? Is this what 30khz scan frequency looks like on a PSone? Haven't had a chance to tinker with this for a while, but it sounds like you're familiar with this condition. Any hints?

    BTW, I was following Mpro's directions when I wired it up.

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