0
1
2
3
4
5
6
7
8
A
A
B
B
VCC
5V VCC
VCC
330kΩ 31J1 D
E
VCC 30 29 28 27 25 19 18 17
4 3 2 1 15 14 13 12
D0 D1 D2 D3 D4 D5 D6 D7
11 10 9
A B C
7
~G
GND
U2
Y
5
~W
6
9 multiplexed
U1 1 2 3
A B C
6 4 5
G1 ~G2A ~G2B
LED1 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
15 14 13 12 11 10 9 7
1 2 3 4 5 6 7 8
12
D
74LS138N
VCC 330kΩ CA
E
VCC 5V
74LS151N
U5
GND 14 F
14 1
V1 1 Hz 5 V GND
INA INB
2 3
R01 R02
6 7
R91 R92
U3
QA QB QC QD
12 9 8 11
C
200Ω
VCC 5V
A
5V VCC
C
A B C D E F G H
15 11
21
26 VCC
U4
7 1 2 6
A B C D
3 5 4
~LT ~RBI ~BI/RBO
7490N
OA OB OC OD OE OF OG
13 12 11 10 9 15 14
2410 1316 2022 23
F
7447N
G
G
GND
0
1
2
3
4
5
6
7
8