I've been interested in video creation and modification for a long time, right after I've read about the Sandin project, the synkie project and LZX industries modules.

All use the composite analog video protocol (PAL/NTSC). It's a complicated signal that combined the synchronisation signals needed for the monitor and the color informations into one signal !

This signal contains digital (sync signals) and analog parts(colors).
It requires large bandwith that most op-amps can't handle, at least 3Mhz.

Being an old analog protocol, it tends to disappear. Analog tv is a thing of the past now and monitor with composite input will certainly vanish as well. I don't even need to mention the death
of cathode ray monitor.

Two reasons for the choice of VGA, the obsolescence of the PAL and the simpler protocol of the VGA. The VGA protocol is simpler, the monitor receives all the signal on different wires.

I want to keep the all project simple and as cheap as possible (the most difficult part I guess).

I decided to take the LZX Industries standard for signals (1Vpp DC)