Automatic LED Emergency Light
NOTE: Considering the doubts raised by many of our valuable readers in our Comments section, this circuit has been modified by Mr.Seetharaman, one of our valuable contributors. You can see his modified circuit here: Automatic LED Emergency Light Modified.
Description:
This is the circuit diagram of a low
cost emergency light based on white LED.The white LED provide very
bright light which turns on when the mains supply is not there.The
circuit has an automatic charger which stops charging when the battery
is fully charged.
The IC LM 317 produces a regulated 7 V
for the charging of Battery.Transistor BD 140 drives the out
put.Transistor BC 548 and Zener diode controls the charging of the
battery.
Tips:
It is always better to connect a heat
sink with BD 140.Before using the circuit out put of LM317 must be set
to 7V by adjusting the potentiometer.
Automatic LED Emergency Circuit Diagram:
Note: R3 to R14 are all 100 ohms
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