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Door Security Alarm | Circuit Diagram
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![Door/Window alarm circuit - Gadgetronicx](https://i2.wp.com/www.gadgetronicx.com/wp-content/uploads/2017/02/window-alarm.jpg)
![Door opening alarm circuit diagram](https://i2.wp.com/mechatrofice.com/wp-content/uploads/2017/12/door-opening-alarm-using-reed-switch.png)
Door opening alarm circuit diagram
![Fridge Door Alarm Circuit using 555 Timer - Electronics Projects](https://i2.wp.com/circuits-diy.com/wp-content/uploads/2020/03/fridge-door-alarm-circuit-using-ne555-timer-1024x702.png)
Fridge Door Alarm Circuit using 555 Timer - Electronics Projects
![Door Security Alarm Circuit for Alerting if Door was Opened - Homemade](https://i2.wp.com/www.homemade-circuits.com/wp-content/uploads/2016/10/door2Balarm.png)
Door Security Alarm Circuit for Alerting if Door was Opened - Homemade
![Forget door alarm circuit | ElecCircuit.com](https://i2.wp.com/www.eleccircuit.com/wp-content/uploads/2017/05/Forgot-door-alarm-circuit.jpg)
Forget door alarm circuit | ElecCircuit.com
![Door Security Alarm | Circuit Diagram](https://i2.wp.com/www.circuitdiagram.org/images/door-security-alarm-circuit.gif)
Door Security Alarm | Circuit Diagram
![Thief/ Door alarm using a transistor - Gadgetronicx](https://i2.wp.com/www.gadgetronicx.com/wp-content/uploads/2018/10/door-alarm-circuit.png)
Thief/ Door alarm using a transistor - Gadgetronicx
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Simple Door Alarm Project under Repository-circuits -43611- : Next.gr
![Transistor based Security Alarm](https://i2.wp.com/www.engineersgarage.com/wp-content/uploads/2019/07/Circuit-Diagram-Transistor-based-Security-Alarm.gif)
Transistor based Security Alarm
![Infrared Security Alarm Using PhotoTransistor - circuitspedia](https://i2.wp.com/circuitspedia.com/wp-content/uploads/2018/03/IR-Security-Alarm-circuit-diagram.jpg)
Infrared Security Alarm Using PhotoTransistor - circuitspedia