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Sensitive Fire Alarm Circuit using Infrared IR LED from circuits-diy.com
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The Shadow Of An Intruder Passing Few Meters Nearby The Circuit Is Enough To Trigger The Alarm.
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Web The Figure Below Shows Project Of A Light Activated Alarm Circuit Using 555 Timer Ic.
Web circuit diagram of the light sensitive fire alarm is shown in fig. The circuit will activate a peizo buzzer for few seconds when laser light falls on the surface of ldr. The alarm circuit provides all of the functions for burglar alarms, temperature, moisture and.
Web A Fire Alarm Circuit Has Three States To Do The Requisite Supervision:
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Web Fridge Door Alarm Circuit Diagram And Explanation:
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It Is Built Around L14F1 Photo Transistor (T1), Bc547 Transistor (T2) And Ne555 Timer (Ic1).
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