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Timer From Old Quartz Clock

Timer From Old Quartz Clock

16

IC1

CD4040

10

8

3

2

4

13

12

Q5

14

15

1

Q6

Q7

Q8

Q9

Q10

Q11

Q12

11

1

2

3

4

5

6

7

8

ON

S1

OFF

CLOCK

CIRCUIT

R1

150Ω

D1

1N4001

D2

D3

D4

J1

J1 = 5V DC SOCKET

D1-D12 = 1N4148

T2

BC547

R4

100K

R8, 10K

T1

BC547

R3

20K

S1

RESET

S1 = 8-WAY DIP SWITCH

GND

R5

10K

T3

BC547

R7

10K

PZ1

PIEZO

BUZZER

R6

100K

3.6V

BATT.

CLOCK

D11

D12

D10

D9

D8

D7

D6

D5

R2

10K

Timer From Old Quartz Clock

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publish time: 2020-09-24
Circuit Everyday

You can use the old quartz clock circuit to build an accurate, low-cost timer. The timer can be set for up to 2 hours, which is sufficient for most daily activities.

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