Electronics Circuit Diagram

According to wikipedia.org, an emergency light is a battery-backed lighting device that comes on automatically when a building experiences a power outage. Below schematic shows a simple design of emergency light circuit diagram.

Emergency Light Circuit Description

If AC supply is present, the alternating voltage is passed through diode D1. D1 behaves as a half wave rectifier and lets only positive voltage to pass on. When AC supply goes off, capacitor C1 discharges through R3. Due to this discharging of C1, voltage across C1 decreases gradually.

Emergency Light Circuit Parts List

R1, R2 _____200k – 1W
R3 ________100k – 1/2W
R4 ________100k – 1/2W
D1 ________IN4004
C1 ________0.1mF – 50V
T1 ________BC148B
T2 ________SL100
Dry cell battery 1.5V
Bulb 3V

Emergency Light Application

Emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories.

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