Introduction: This project of power failure alarm is a device that will be monitoring the power supply which will trigger a buzzer when the main supply fails. When the main supply fails the light emitting diode (LED) will be turned on. This power supply monitoring device will help us to know that there might be some loss of power supply to some critical installations, when the buzzer sounds or when the LED turns on, an action need to be taken to rectify the solution.
|Resistors||100-kΩ variable resistor, 10-KΩ resistor|
|Capacitor||Electrolytic capacitor (4700µF, 100nF)|
|Transistor||BC 558/BC158 PNP transistor|
|Piezo electric buzzer|
Working: The power failure alarm is designed to alert you by triggering a buzzer or alarm in the event of a mains supply cut off, and by activating an LED light, As this is a power supply monitoring device so it will be helpful to inform when there is some loss of power. When the main power supply is there, the capacitor will be energized (charged) but when the supply cuts off the LED will light up until the capacitor is charged.
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