R4

DC 7

Q 3GND

1VCC

8

TR2

TH6

CV5

U1

NE555

CKA14

Q012

CKB1 Q1 9

Q2 8

Q3 11

R0(1)2

R0(2)3

R9(1)6

R9(2)7

U2

7490

A7

QA13

B1 QB 12

C2 QC 11

D6 QD 10

BI/RBO4 QE 9

RBI5 QF 15

LT3 QG 14

U3

7447

A110

S19

A28 S2 6

A33 S3 2

A41 S4 15

B111

B27

B34

B416

C013 C4 14

U4

7483

R81k

R91k

D1LED

R100R1

C10.01u

C20.01u

D2

1N4007

+5v

Co