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Fridge Door Alarm Circuit using 555 Timer - Electronics Projects

Thief/ Door alarm using a transistor - Gadgetronicx

How to Build a Door Alarm Circuit

Door Security Alarm Circuit for Alerting if Door was Opened - Homemade

Forget door alarm circuit | ElecCircuit.com

Simple Door Alarm Project under Repository-circuits -43611- : Next.gr

Laser Security Alarm Circuit

Transistor based Security Alarm

Magnetic Door Alarm Circuit using 3144 Hall Effect Sensor

Door/Window alarm circuit - Gadgetronicx