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Magnetic Door Alarm Circuit using 3144 Hall Effect Sensor
An Expandable SCR Based Burglar Alarm circuit diagram and instructions
Magnetic Door Alarm Circuit Diagram using Hall Sensor and 555 Timer IC
SIMPLE FIRE ALARM USING PHOTO DIODE, BT169D SCR AND BUZZER FOR SCHOOL
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How to Make Simple SCR Circuits
How to make door Alarm Circuit using scr