How to make power supply failure alarm

How to make power supply failure alarm

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On: 18 Okt, 2018

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Category: Alarm

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If you want to make alarm alert like UPS do. when electricity of UPS will be shouting louder which that announce/remain us that electricity is off. Following this circuit will guide you how to make alarm alert for power supply.


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If you want to make alarm alert like UPS do. when electricity of UPS will be shouting louder which that announce/remain us that electricity is off. Following this circuit will guide you how to make alarm alert for power supply.


Most of the power supply failure indicator circuits need a separate power supply for themselves. But the alarm circuit presented here needs no additional supply source. It employs an electrolytic capacitor to store adequate charge, to feed power to the alarm circuit which sounds an alarm for a reasonable duration when the supply fails.


This circuit can be used as an alarm for power supplies in the range of 5V to 15V. To calibrate the circuit, first connect the power supply (5 to 15V) then vary the potentiometer VR1 until the buzzer goes from on to off. Whenever the supply fails, resistor R2 pulls the base of transistor low and saturates it, turning the buzzer ON.

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