Pyroelectric Infrared Sensor Anti-theft Circuit DIY Kit Soldering Practice Board

Circuit composition and function The circuit consists of pyroelectric infrared sensor PIR to detect infrared triodes VT1 and IC2A to amplify signals IC2B and IC3 as comparators triodes VT2 and buzzer HA to form an alarm circuit VT3 and peripheral components to form a startup delay circuit The circuit is equipped with rectification filter and battery E in order to continue to supply power preventing of power failure This circuit can be used as home anti theft When family leaves the room switch S2 is closed and the circuit works As soon as someone enters the room for a while they will sound an alarm The monitoring range is 7m and 86 Note did not have assemble manual Package included 1 x Pyroelectric Infrared Sensor Anti theft Circuit DIY Kit