- 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.
- t 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.
