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Infrared Security Alarm Using PhotoTransistor

Infrared Security Alarm Using PhotoTransistor

IR Based High sensitive Door Security Alarm circuit diagram This IR based security Alarm circuit is highly sensitive. Here A Phototransistor L14F1 is used for the detection of IR rays.  555 timer ic is used to provide a pulsed output For Emitting of IR rays at specific Frequency. The first part of the IR Security Alarm circuit including 555 ic […]

IR Based Security Alarm Circuit

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 for some duration and then after automatically stopped. So even any person or gateman or guard is not available at door, no can be entered […]