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![Door Alarm](https://i2.wp.com/www.circuit-diagrams.net/uploads/1/4/door-alarm_1408193309_max.gif)
![Fridge Door Alarm Circuit Diagram using 555 and LDR](https://i2.wp.com/circuitdigest.com/sites/default/files/projectimage/fridge-door-alarm-circuit-using-555-timer.jpg)
![Magnetic Door Alarm Circuit using Hall Sensor](https://i2.wp.com/circuits-diy.com/wp-content/uploads/2020/07/Magnetic-Door-Alarm-Circuit.png)
![Door opening alarm circuit diagram](https://i2.wp.com/mechatrofice.com/wp-content/uploads/2017/12/door-alarm-circuit-diagram-using-ic-555.png)
![How to Build a Door Alarm Circuit](https://i2.wp.com/www.learningaboutelectronics.com/images/Door-alarm-circuit.png)
![Door Security Alarm Circuit](https://4.bp.blogspot.com/-D5Sw5cEZ_1o/V_CdMI-t1_I/AAAAAAAAOx4/9z3mmZBheAMAXHD-_5C8-XgPMSHEXOPBQCLcB/s1600/door%2Balarm.png)
![How to build Fridge Door Alarm Circuit - circuit diagram](https://i2.wp.com/www.circuit-finder.com/files/650/fridge-door-alarm-circuit_orig.gif)
![Nonstop-Free Electronic Circuits Project Diagram and Schematics](https://2.bp.blogspot.com/-8H1VZ8TO6r4/XBX0ecFX2vI/AAAAAAAABG8/MAdPHQO5hX44Oh6Q76JM800Zws9nonusgCLcBGAs/s1600/Door%2BOpener%2BAlarm%2BCircuit%2BDiagram.png)
![Magnetic Door Alarm Circuit using 3144 Hall Effect Sensor](https://i2.wp.com/www.circuits-diy.com/wp-content/uploads/2020/01/magnetic-door-alarm-circuit-3144-hall-effect-sensor.png)