Security Alarm - circuitspedia

Security Alarm

Darkness detector Shadow alarm circuit

dark sensor circuit diagram

Light sensor circuit Shadow detector A Buzzer beeped and led will glow for a fixed time when a shadow falls on a phototransistor. This is a very sensitive light-sensitive circuit operated using the 741 opamp …

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IR Based Security Alarm Circuit

Automatic Door Security Alarm System Introduction This is used to any Door or Gate to Detect Any human person or any animal pass across the gate. When Any Crosses the gate then Automatic alarm beeped …

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