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Door Security Alarm Circuit
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![Door Opening Alarm using Hall Sensor | Detailed Project Available](https://i2.wp.com/electronicsforu.com/wp-contents/uploads/2016/04/827_C2D_Fig_1.jpg)
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Door opening alarm circuit diagram
![Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC](https://i2.wp.com/circuitdigest.com/sites/default/files/projectimage/Magnetic-Door-Alarm-Circuit-using-Hall-sensor.jpg)
Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC
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Door alarm | All About Circuits
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Simple Door Alarm
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Door Opening Alarm / Alert Circuit
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Magnetic Door Alarm Circuit using 3144 Hall Effect Sensor