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Digital Frequency Comparator

Digital Frequency Comparator

7

6

4

2

1

9

10

3,8

13

16

10

15

IC7

74LS47

12

11

1

7

8

9

14

3

RBI

Vcc

A

B

a

b

c

d

e

f

g

6

2

C

D

4

LT

5

BI/RBO

1

8

2

IC6

74LS90

12

9

7

11

3

CP0

CP1

P

Q

R

S

5

6

10

14

3

IC5

NE555

4

RST

8

1

5

7

6

2

+

12

IC4(B)

74LS74

9

8

CLK

10

11

R

13

Q

D

S

Q

7

6

4

2

1

9

10

3,8

13

16

10

15

IC3

74LS47

12

11

1

7

8

9

14

3

RBI

Vcc

A

B

a

b

c

d

e

f

g

6

2

C

D

4

LT

5

BI/RBO

1

8

2

IC2

74LS90

12

9

7

11

3

CPO

CP1

P

Q

R

S

5

6

10

14

4

IC1

NE555

3

RST

8

1

5

7

6

2

+

2

IC4(A)

74LS74

9

6

CLK

14

3

R

1

Q

D

S

Q

4

5

N4

13

12

11

N1

2

1

3

10

N3

7

9

8

14

N1

5

4

6

R1

47K

VR1

47K

C1

10μ

16V

C2

0.1μ

R2

47K

R3

R9

S2

DIS1

R3-R9 = 220Ω

R10

1K

LED1

R11

220Ω

IC8 (N1-N4) = 74LS00

S1 = DPDT SWITCH

S2 = PUSH-TO-ON SWITCH

R14-R20 = 200Ω

R14

R20

R21

220Ω

LED2

GND

DIS1-DIS2 = LTS542 COMMON ANODE 7 SEGMENT DISPLAY

R13

47K

C4

0.1μ

C3

10μ

16V

VR2

47K

R12

47K

+5V

DIS2

Digital Frequency Comparator

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publish time: 2020-09-28
Circuit Everyday

This is an oscillator digital frequency comparator, which displays the result through 7-segment frequency. This device consists of a display and light-emitting diode (LED). When the frequency count of the oscillator is lower than "8", the corresponding LED remains off. Once the count reaches "8", the LED will light up.

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