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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.
1 x Pyroelectric Infrared Sensor Anti-theft Circuit DIY Kit