GN

D

Reset (reset=H

)Latch (follow

=L)

overflow=H

Clock

5V

Decim

al point control

Toggle (enable=L)

+5V!!

Count on rising edge.

point=L

underflow=H

BR

W/C

RY

(redesigned 02/2004 with 1M

pot as shown above)

Up/D

own counter, m

ax 1MH

z; count latch, overflow latch;

controllable decimal point, adjustable LE

D brightness

(c) 09/2002 by Wolfgang W

ieser

3

A 1

B 15

C 14

D 13

E 12

F 3

G 2

BRW 11

CRY 10

UP9

DN7

RESET5

TE4

LE6

CNT-5

168VSS VDD

CN

T-5P

A 1

B 15

C 14

D 13

E 12

F 3

G 2

BRW 11

CRY 10

UP9

DN7

RESET5

TE4

LE6

CNT-4

168VSS VDD

CN

T-4P A 1

B 15

C 14

D 13

E 12

F 3

G 2

BRW 11

CRY 10

UP9

DN7

RESET5

TE4

LE6

CNT-3168VSS VDD

CN

T-3P

A 1

B 15

C 14

D 13

E 12

F 3

G 2

BRW 11

CRY 10

UP9

DN7

RESET5

TE4

LE6

CNT-2

168VSS VDD

CN

T-2P

A 1

B 15

C 14

D 13

E 12

F 3

G 2

BRW 11

CRY 10

UP9

DN7

RESET5

TE4

LE6

CNT-1

168VSS VDD

CN

T-1P

1 2

CN

T-C

LOC

K

1 2

CN

T-S

UP

PLY

12

CN

T-O

FLW

1 2 3C

NT

-CT

RL

T1

2 31

IC6A

411

A E

S

(LEDBIAS)

A C

R

U$6

Q3

1

S0

3R

04

EN

5

R1

6

S1

7Q

19

Q2

10

S2

11R

212

Q0

13

R3

14

S3

15

OV

ER

FLO

W-LA

TC

H

8 16OV

ER

FLO

W-LA

TC

HP

VDDVSS

1 2IC8A

3 4IC8B

5 6IC8C

98

IC8D

11 10IC8E

13 12IC8F

147VSS VDD

IC8P

1 2 3 4 5

CN

T-D

PS

EL

C2

C3

C4

C5

C6

C7

12

JP11

12

JP1212345678

U$1

12345678

U$2

12345678

U$3

12345678

U$4

12345678

U$5

764219

10

5

83

gfedcba

dp

CCCC

CNT-LED5

764219

10

5

83

gfedcba

dp

CCCC

CNT-LED4

764219

10

5

83

gfedcba

dp

CCCC

CNT-LED3

764219

10

5

83

gfedcba

dp

CCCC

CNT-LED2

764219

10

5

83

gfedcba

dp

CCCC

CNT-LED1

87654321

U$10

87654321

U$11

87654321

U$12

87654321

U$13

87654321

U$14

1 2JP1

R3

R4

AE

SLEDBRIGHT1

40110

40110

40110

40110

40110

BU

Z11

LMC

6484

100k

TL431CLP

4044N

CD74AC04

CD74AC04

CD74AC04

CD74AC04

CD74AC04

CD74AC04

LED7-15-CC

LED7-15-CC

LED7-15-CC

LED7-15-CC

LED7-15-CC

1M

1k

1M