Apple IIGS RGB video to Component converter

There is a fair amount of retro devices that output RGB.  But these were RGB in TV frequencies.  If you try to hook it up to most VGA monitors, they will not sync properly and you would probably get a picture with lots of lines (if you get a picture at all).  The monitors designed for these devices were readily available a few years back, but they are recently becoming more scarce.  Another way of using these signals is using a standard television with a SCART input and a RGB to SCART connector.  Most PAL TV's have SCART inputs (or so I heard).  Having gone through a local TV store recently,  I checked the TV's, both LCD's and CRT's ... somehow they stopped putting SCART connectors on the newer sets and it's been slowly replaced by component input (Y Pb Pr).  Also most NTSC TV's never had the SCART connector.

Well, that aside, another way to view the output of these devices would be to use the standard composite video out to your TV.  So I take my Apple IIGS, hook up the composite out directly to the TV's video in and ...

As you can see, the stuff that are supposed to be in black and white are tinted with color fringes.  This would be somewhat acceptable for games and applications with mostly graphics.  If you are using it with 80 column text, or graphical text, you will soon get a headache from trying to read it.  The Apple IIGS composite video circuits automatically disable the colour burst signal so you get something in black and white.  This improves the readability somewhat but on screens with combined graphics + text you get the same problem.  That is the main reason why the came out with RGB monitors.

Well, my TV has the standard Y Pb Pc component input.  If you connect something meant for RGB to it, it works, everything is as clear as RGB, but with the wrong colours.  That's a good enough start for me.  After searching around for a DIY RGB to component converter, I found one in my local electronics store already packaged as a kit.  It was published as a Silicon Chip article.  I proceeded and assembled the kit.  After that,  I think the TV expects the SYNC signal with the luminance (Y) signal, or it just displays the "no signal" blue background.  

A quick question to Tony Diaz (thanks Tony) gets me what I needed.  It is safe to just tie the composite SYNC signal with the Green output to have "Sync on green".  After wiring a makeshift  D15  IIGS RGB with wires leading directly to the RGB to component converter I finally have the results I was hoping for.  Here's are comparisons of using the composite "video in" image and the "RGB converted" image.  

Last 2 are output of the converter.

The image above is the same TV using the composite "video in".

This one is the same as above, but using the converter.  

Close up of the converted image.  Note the clear black and white text.

Last 3 various images of composite out.

Image of the same screen on converted output

Last 2 are pictures of the Tour of the Apple IIGS.  They are "graphical text".  You should be able to tell which is which ;)

That's the box itself.  Excuse the mess in the background.

Another 2 images for comparison... again you should be able to tell which is which.

More examples

Entire screens.