Sync Stripper
EDIT - it seems a lot of people want this for their VGA Scaler. Well arcadeforge have developed and now sell the Sync Strike, I've tried one out and it works brilliantly with the VGA scaler. You can even buy the complete setup, Sync Strike, VGA Scaler and SLG3000 as a kit now, a plug and play kit for playing retro consoles on your HD TV via VGA with an awesome picture. Thanks Jochen :-)
Some TVs or Signal Converters (VGA to RGB scalers etc) work better if the Composite Video signal is cleaned up, the video signal is ripped out, leaving the clean Composite Sync signal.
This is the schematic I used from GamesX
And here is a diagram of the board I made, along with a few photo's. You can make it small enough so that it fits in a scart plug. The one I made below is obviously on too big a piece of board, I was originally going to mount it in a project box along with some other bits and pieces, but ended up not using it in the end, and making a much smaller one to put into a scart plug, I squashed the components by putting the leg from the capacitor and the chip through the same hole etc.
Here you can see one I managed to squeeze into a scart plug, using scart pin 8 to supply the power. I joined up all the ground pins, connected Red, Green, Blue, Left, Right, 8 and 16 for AV and RGB switching etc from the relevant pins on the scart socket at the other end of the cable.
This one below is the smallest I could make it to fit into a scart socket plug for a converter I was making, I had to squeeze a couple of cables in also so.
Notes
The LM1881 doesn't provide a Horizontal Sync Output, you may get away with using the Composite Sync Output instead of it, it really depends on the display device.
I built this for my CGA/EGA/RGB to VGA GBS-8220 upscaler (that's what the last two photos are from), I just needed the Composite Sync output, and selected the RGBS input on the upscaler. I did try the upscaler without the sync stripper, but when I tried my Saturn it would display a picture for a few seconds, and then vanish.
Scart Pinout
Summary of Components needed
2 x 0.1uf Capacitors
1 x 680k Resistor
1 x LM1881n chip
Wires, Veroboard/Stripboard
