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Magnetic Door Alarm Circuit using Hall Sensor

Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC

Gallery | Door Alarm using Magnetic Hall Sensor | Hackaday.io

Fridge Door Alarm Circuit using 555 Timer - Electronics Projects

Simple Door Alarm

Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC

Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC

Thief/ Door alarm using a transistor - Gadgetronicx

How to Build a Tilt Alarm Circuit