Description: This is the circuit diagram of a low cost emergency light based on white LED. ( Automatic LED Emergency Light ).
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 LM317 produces a regulated 7 V for the charging of Battery. Transistor BD140 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 BD140 transistor.
Before using the circuit output of LM317 must be set to 7V by adjusting the potentiometer.
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 LM317 produces a regulated 7 V for the charging of Battery. Transistor BD140 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 BD140 transistor.
Before using the circuit output of LM317 must be set to 7V by adjusting the potentiometer.
Below is the Circuit diagram of an Automatic LED Emergency Light.
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