Wire Loop Alarm Circuit

        

 Introduction:

                This Project Is Wire Loop Alarm or Wire Cut Alarm Circuit Using Only One BC548 Transistor. Also, This Project Is Used as A Door Security Alarm Circuit. This Circuit Is Very Simple Circuit and Very Cheap Circuit. This Project Circuit Board’s Total Cost Is Rs.40(without Power supply)

Working:

                This Project Is Made with BC 548 Transistor. In Collector Pin of Transistor, We Connect the Output Devices Like LED, Buzzer, Multi Tone Speaker etc. The 2.2KΩ Resistor Is Connect with The Base of The Transistor (2^nd Pin) and That 2^nd Pin of Transistor Is Also Connect with The Emitter Pin of The Transistor. The Emitter Pin of The Transistor also Connected with The Ground (-ve) OF the Battery. When These 2pins Are Connected, The Voltage Doesn’t Go Through the Collector Pin of The Transistor. So, The Buzzer Was Quit. When the Contact Broken Through the Emitter Pin and Base Pin of The Transistor, The Voltage Passing Through the Collector Pin of The Transistor. Thus, The Buzzer Alarm Was On.

 

Part List:

       1)  BC 548 Transistor -1

        2)  2.2 KΩ Resistor -1

        3)  1 KΩ Resistor -1

        4)  3 Volt LED -1

        5)  Buzzer -1    

        6)  9 Volt Power Supply -1

        7)  PCB Board

        8)  Some Wires

Uses of The Project:

                        This Project Is Used for School Projects and It Is Used to Make Security Alarm by Making Some Alternates.

Circuit Diagram:

Click Here to See This Article's Video on YouTube:

 

By,

G.Guruvel Sarveshwar,

EEE Dept.

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Guruvel Sarveshwar

Hi, I’m Guruvel Sarveshwar — a passionate creator behind Guruvel Creativities. I specialize in DIY electronics, IoT systems, 3D printing, and web-integrated smart projects. With a drive to innovate and share knowledge, I love turning ideas into reality through practical engineering and creative design.
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