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Resumption Alarm

Resumption Alarm

4

2

IC1

5

1

N1

1

2

3

7

N3

8

9

10

14

1

2

7

4

3

6

2

1

5

8

IC3

555

+

+

+

+

+

C1

0.22μ

R1

1K

D1

230V AC

50HZ

L

N

C2

16V

C3

10μ

16V

R2

10K

S1

SPDT

R3

22K

VR1

50K

C4

10μ , 16V

R5

10K

VR1

47K

R4

1K

C7

100μ

16V

C6

0.01μ

LS1

0.5W

C5

0.04μ

C8

470μ

16V

D3

S2

ON/OFF

SWITCH

9V

BATT.

IC1 = MCT2E

IC2 (N1-N3) = CD4011

D1-D3 = 1N4007

S1 = SPDT SWITCH

D2

N2

6

4

5

Mains Failure/Resumption Alarm

1
0
0
publish time: 2020-09-24
Circuit Everyday

When the AC power fails or recovers, the power indicator will sound an alarm. Especially suitable for industrial installations, cinema halls, hospitals, and other places.

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