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Simplest theft alarm circuit - Gadgetronicx

Alarms and security circuit diagrams

Free Schematic Diagram: Modular Burglar Alarm Circuit

Burglar alarm Circuit using IC 555 - Gadgetronicx

Burglar Alarm: Burglar Alarm Circuit Diagram Using Ic 555

Burglar Alarm Works for Both N.O and N.C Contacts – Simple Circuit Diagram

Two-Zone Burglar Alarm circuit diagram and instructions

Burglar Alarm: Burglar Alarm Circuit Diagram Using Ic 555

Single-Zone Automatic Burglar Alarm System - EEWeb