Mains Supply Failure Alarm Circuit Diagram

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Why do I need transistor in the following mains power failure circuit

Why do I need transistor in the following mains power failure circuit

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Mains Supply Failure Backup Light | Detailed Circuit Diagram Available
Mains Supply Failure Alarm | NCT - National Certificate in Technology

Mains Supply Failure Alarm | NCT - National Certificate in Technology

Power Failure Alarm

Power Failure Alarm

Paul In The Lab: Mains Failure Alarm Stripboard Layout

Paul In The Lab: Mains Failure Alarm Stripboard Layout

Power failure alarm circuit without individual power supply - Gadgetronicx

Power failure alarm circuit without individual power supply - Gadgetronicx

12v Buzzer Circuit Diagram - Circuit Diagram

12v Buzzer Circuit Diagram - Circuit Diagram

Power Failure Alarm Circuit Diagram | Electronic Circuit Diagrams

Power Failure Alarm Circuit Diagram | Electronic Circuit Diagrams

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