It must have the following features:
Promote 15.75 Khz video into 31.5 Khz (VGA) video
Deinterlace an interlaced video signal.
Accept NTSC input video (60 hz)
Accept PAL input video (50 hz)
Some monitors are rude and they intentionally block 50 hz signals from working. So it must have a switch to convert 50 hz video into 100 hz video.
Other monitors are rude and intentionally block 100 hz signals from working so another switch is needed to convert 50 hz video to 60 hz.
Accept a wide range of resolutions:
The most commonly used Amiga resolutions are:
320x256p (50 hz PAL)
640x256p (50 hz PAL)
1280x256p (50 hz PAL)
320x512i (50 hz PAL)
640x512i (50 hz PAL)
1280x512i (50 hz PAL)
320x200p (60 hz NTSC)
640x200p (60 hz NTSC)
1280x200p (60 hz NTSC)
320x400i (60 hz NTSC)
640x400i (60 hz NTSC)
1280x400i (60 hz NTSC)
It MUST output 24-bit color (16 million colors) or it is totally completely worthless garbage. 16-bit color is nowhere near enough.
If you can build an external flicker fixer with the above capabilities that works properly without overheating then I will buy one!
Since the title of the thread is "Mother of all Flicker Fixers", it would be nice if it had multiple inputs so that multiple gaming systems can be connected at once to the same giant screen. That way it is easy to select any particular system to route to the monitor. I don't need this feature but I know that others do.