Emergency Light & Alarm

This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When power supply is restored, the lamp or the alarm is switched-off. A switch provides a `latch-up` function, in order to extend lamp or alarm operation even when power is restored.

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khaleel   Aug 9, 2007

give complete information on emergency light and alarm how it works? how can we do this project? give viva questions on it?

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