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Transistor based Security Alarm
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Thief/ Door alarm using a transistor - Gadgetronicx

Burglar Alarm Project: Burglar Alarm Circuit Using Transistor

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Infrared Security Alarm Using PhotoTransistor » Circuitspedia.com

Door opening alarm circuit diagram

Fire Alarm Door Holder Wiring Diagram - blogmaygomes

Fire Alarm Door Holder Wiring Diagram - blogmaygomes
Why Install an Extra Relay for a Door Holder?

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