Simple Power Failure Detector Circuit Diagram Using transistor, buzzer alarm, for DC power supply. Using transistor, buzzer alarm, for AC 220 V power supply. Using op amp, LED indicator, for DC power supply. Main Function. The main function of the proposed power failure indicator circuits is to alert or notify about a power failure situation in an electrical system. A very simple 12V power supply failure alarm circuit. Low voltage, no stand-by current, piezo alarm. By: Manisha Patel . How the power failure alarm works. This proposed circuit is connected to the power mains via the transformer T1. The AC voltage is rectified by the diode D1 and is filtered by C1.
As soon as the mains power fails, the charge stored in the capacitor acts as a power-supply source for transistor T1. Since, in the absence of mains supply, the base of transistor is pulled 'low' via resistor R8, it conducts and sounds the buzzer (alarm) to give a warning of the power-failure. Power Supply Failure Alarm Circuit Power failure alarm using transformer and relay. This main power failure alarm circuit is very simple and is very useful. It can be used with electric ovens, a refrigeration system or to prevent a thief from cutting off the electrical power, because it immediately warns of the problem. It also serves you to warn us when the fuses have blown.
Detailed Circuit Diagram Available
Uninterrupted power supply is crucial, especially for electronic devices and systems. Power interruptions or failures can lead to several risks. To keep eye (ear) on the mains power supply all the time, here is the simple and easy to construct Mains Power Interruption or Failure Alarm Circuit design.
Working of Power Supply Failure Alarm. After soldering the components as per circuit diagram, connect the power supply and turn it on. Then to check the system, turn off the power supply and you will see buzzer start beeping as soon as you turn off the power.The working is same like an emergency light, which also turns on as soon as the power goes off.
How to Make a Power Interruption Alarm Circuit Circuit Diagram
The working of this power failure alarm circuit is very simple. A power Supply of 220 volts is turned on. This 220 volt is converted into 12 volts by the step-down transformer. Rectification is done by a diode bridge. The diode bridge consists of 4 diodes connected in series with each other. The rectified 12 volts are then supplied to the relay
