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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).

Design Drawing

schematic diagram

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Color Demod and Sync
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Luma Delay and Color Matrix
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Motor Controller
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Motor ControllerV2
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PCB

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BOM

BOM download Purchase Parts

ID	Name	Designator	Quantity
1	120p	C1,C8	2
2	82p	C2,C10	2
3	22n	C3,C11,C12,C16,C18,C21	6
4	180p	C4,C5	2
5	10n	C6,C7,C23	3
6	220p	C9,C19,C25,C30,C31	5
7	47n	C13	1
8	470n	C14,C15,C26,C27,C28	5
9	10u	C17	1
10	470p	C20,C29,C35	3
11	330p	C22,C32	2
12	10u	C24	1
13	PAL Delay	H1	1
14	Service	H2	1
15	10u	L1,L2	2
16	BC547	Q1,Q2,Q4,Q5,Q6,Q8,Q9,Q10,Q11,Q13,Q14,Q15,Q20,Q21	14
17	BC557	Q3,Q7,Q12,Q16,Q17,Q18,Q19,Q22	8
18	75	R1	1
19	470	R2,R57,R61,R68	4
20	10k	R3,R4,R7,R8,R9,R11,R14,R15,R16,R18,R19,R22,R35,R36,R63,R71,R74,R80,R85,R89	20
21	1k	R5,R17,R20,R34,R39,R44,R45,R53,R60,R66,R67,R70	12
22	2k2	R6,R65,R79,R81,R82	5
23	1M	R10	1
24	4k7	R12,R13,R38,R87,R88	5
25	8k2	R21,R47	2
26	3k3	R23,R25,R54	3
27	18k	R24	1
28	6k8	R26	1
29	47k	R27,R28,R83,R84	4
30	30p	TC1,TC2	2
31	100k	TR1	1
32	10k	TR2,TR3,TR12	3
33	TDA4555	U1	1
34	7.16M	X1	1
35	8.86M	X2	1
36	100p	C33,C34	2
37	100u	C36	1
38	100n	C37	1
39	1N4148	D1,D2,D3	3
40	12k	R29	1
41	27k	R30	1
42	1k2	R31	1
43	5k6	R32,R48,R51,R55,R58	5
44	680	R33,R37	2
45	100	R40,R41,R77,R78	4
46	100k	R42,R46,R69,R72,R73	5
47	33k	R43	1
48	1k8	R49,R56,R59	3
49	15k	R50	1
50	1k5	R52	1
51	56	R62	1
52	560	R64	1
53	RGB/RC	SW1	1
54	5k	TR4,TR6,TR7,TR9	4
55	500R	TR5,TR8,TR10	3
56	TDA4565	U2	1
57	CD4017BE	U3	1
58	CD4066BD	U4	1
59	MOTOR	M1,M2	2
60	220	R75	1
61	39	R76	1
62	1k	TR11	1
63	Colorwheel sensor	U5,U6	2
64	BD139	Q23	1
65	22k	R86	1
66	4V7	ZD1	1