https://youtu.be/HRdkIzKK49I

Composite video to field sequential color converter

U1 (TDA4555) demodulates color, filtered luma is delayed and color is sharpened in U2 (TDA4565), U3 (CD4017) and U4 (CD4066) then select desired color channel on which composite sync is restored and resulting signal outputted.

TR1 - Burst gating duration, set to minimum and turn up just until you get color.

TR2 - Hue (NTSC only), adjust for correct color tones.

TR3 - Luma delay, keep at maximum (yes can be left out).

TR4 - Blue level, adjust for correct blue saturation.

TR5 - Blue offset, adjust for correct blue brightness.

TR6 - Red level, adjust for correct red saturation, should be adjusted first.

TR7 - Green level, adjust for correct green saturation.

TR8 - Green offset, adjust for correct green brightness.

TR9 - Cyan level, adjust for correct cyan saturation.

TR10 - Cyan offset, adjust for correct cyan brightness.

Motor controller

Senses colorwheel rotation speed and phase, phase compares (XOR) the colorwheel rotation with red sync, resulting PWM signal then fine tunes motor speed, for phase and lock fine adjustment a TR11 trimmer is provided.

TR11 - Phase and lock, adjust for lock and correct phase (color purity).