Infrared Door Security Alarm circuit diagram

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 […]

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