Automatic LED Emergency Light Circuit

this is the simple and cost effective automatic emergency light circuit with light sensing. This system charges from main supply and gets activated when main supply is turned OFF. This emergency lamp will work for more than 8 hours.

Automatic Emergency Light Circuit Diagram

Components

• 9V step down transformer
• Diode bridge – 1A 
• 7808 voltage regulator
• Light dependent resistor – 2M ohm
• IRF540 MOSFET transistor
• BC548 PNP transistor
• DC battery – 6V, 4.5Ah
• Pot – 10k
• 4 high bright LED, s – 3v@15mA
• red led
• 1n4007 diodes – 1
• electrolytic capacitor – 470uF
• ceramic capacitor – 0.1uF
• 1k resistors – 2
• 10 ohm resistors – 2
• 10k resistor – 1