VGA to RGB-Scart circuit

[mwillberg]

Please take a look at this page:
http://www.hut.fi/Misc/Electronics/circuits/vga2tv/circuit.html

I started thinking about using the standard VGA-RGB for input into a TV when I noticed the huge different in quality I got from a digital STB (also showing graphics) when switching from composite to RGB. The difference was really amazing.

After all, VGA seems to be the same signal, only thing that needs to be changed is the sync.

The instructions on the page seems to be a little bit outdated, since there is a lot of stuff about DOS, but using PowerStrip it should be quite easy to change to 720x576 interlaced mode, or failing that using 800x600 and using ZoomPlayer to compensate.

Please correct me if I'm wrong, but I know I have managed to turn on interlaced output on my ATi All-In-Wonder, but that lead to two images of my desktop on top of each other. I'm guessing that's because I took the signal from the TV-output. It should work better if one used the actual VGA-output, right?

Ok, enough rambling. I was just curious if someone has tried to build one of these adaptors and if so, what's your experience? What is the quality like compared to coaxial/SVHS from tv-outputs?

[theReal]

I'm not 100% sure, but I think what you're thinking of is a normal scan-converter. You can buy scan converters for not much money, but usually they're not recommended compared to good s-video outputs from graphics adapters (I've seen some threads here where I got the notion that a scan-converter is only the way to go if your graphics adapter doesn't have tv-out).

[mwillberg]

Well, actually, no... I don't think a scan-conversion is necessary. If it would be possible to set the card to 50Hz interlaced (for my PAL TV) no conversion should be needed. The signal for RGB should be correct, the only thing the circuit does is convert the sync-signal.

Anyway, I was going to try this, but I just noticed that my RGB-input on my TV has broken, my PSX-signal is screwed up when using RGB. So I can't even try it and report my findings...

And when I _do_ get a new TV I might not be inclined to start hooking up experimental solderings the first thing I do. :)