This document is a circuit diagram showing an LED display circuit using 4013 dual D flip-flops and various other components like resistors, capacitors, and LEDs. The circuit uses multiple 4013 chips connected together to sequentially light up the LEDs in a cascading pattern when a clock signal is applied. Power and ground connections are shown at VCC and GND.

1. 5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
RESET FF
VCC
VCC VCC
VCC VCC
VCC
VCC
VCC VCC
VCC
VCC
VCC
Title
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Date: Sheet of
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B
1 1Thursday, December 27, 2012
Title
Size Document Number Rev
Date: Sheet of
<Doc> <RevCode>
<Title>
B
1 1Thursday, December 27, 2012
Title
Size Document Number Rev
Date: Sheet of
<Doc> <RevCode>
<Title>
B
1 1Thursday, December 27, 2012
L3
LED
L3
LED
L1
LED
L1
LED
Q2
2N2222
Q2
2N2222
R7
220R
R7
220R
U4A
4013
U4A
4013
D
5
CLK
3
Q
1
Q
2
14
VDDS
6
GND
7
R
4
L2
LED
L2
LED
J2
Mat Thu
J2
Mat Thu
1
2
3
R2
39k
R2
39k
U1
PT2249
U1
PT2249
GND
1
RXin
2
H1
3
H2
4
H3
5
H4
6
H5
7
S5
8
S4
9
S3
10
S2
11
S1
12
C3
13
C2
14
0
15
VDD
16
R4
2k2
R4
2k2
U5B
4013
U5B
4013
D
9
CLK
11
Q
13
Q
12
14
VDDS
8
GND
7
R
10
R6
100
R6
100
R3
10k
R3
10k
U3B
4013
U3B
4013
D
9
CLK
11
Q
13
Q
12
14
VDDS
8
GND
7
R
10
C2
102
C2
102
R15
10K
R15
10K
R13
220R
R13
220R
R11
220R
R11
220R
R9
220R
R9
220R
U3A
4013
U3A
4013
D
5
CLK
3
Q
1
Q
2
14
VDDS
6
GND
7
R
4
U5A
4013
U5A
4013
D
5
CLK
3
Q
1
Q
2
14
VDDS
6
GND
7
R
4
+ C5
10uF
+ C5
10uF
R14
220R
R14
220R
R12
220R
R12
220R
R10
220R
R10
220R
L8
LED
L8
LED
L6
LED
L6
LED
L4
LED
L4
LED
R8
220R
R8
220R
U2B
4013
U2B
4013
D
9
CLK
11
Q
13
Q
12
14
VDDS
8
GND
7
R
10
U2A
4013
U2A
4013
D
5
CLK
3
Q
1
Q
2
14
VDDS
6
GND
7
R
4
U4B
4013
U4B
4013
D
9
CLK
11
Q
13
Q
12
14
VDDS
8
GND
7
R
10
L7
LED
L7
LED
L5
LED
L5
LED