SCART to composite video conversion without IC, is that possible?
SCART can carry either RGB or composite video, depending on which pins the source chooses to drive.

But if you have RGB, then there is no easy way to convert it to composite video.  Conversion requires turning the RGB into luminance (monochrome) and chrominance signals, then modulating the chrominance signal on top of the luminance (in a way that is specific to either PAL or NTSC).