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Mains Supply Failure Backup Light

Mains Supply Failure Backup Light

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INPUT

100V TO

300V AC

C2

0.47μ

250V

R2

100Ω

1W

R1

100Ω

1W

C1

0.47μ

250V

D1

D2

ZD1

12V

1W

ZD2

12V

1W

C3

50V

T1

BC547

T2

BC547

C4

4700μ

25V

LED

WHITE

R5

3.3K

R4

10K

R3

10K

D5

D1-D5 = 1N4001 DIODE

D3

D4

Mains Supply Failure Backup Light

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publish time: 2020-09-29
Circuit Everyday

If there is a sudden power failure at night, the circuit will automatically turn on to provide sufficient light for about 30 seconds (expandable), which is enough to initiate emergency response measures or light candles.

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