Infrared burglar alarm circuit schematic

Published:2012/8/16 21:10:00 Author:Ecco | Keyword: Infrared , burglar alarm | From:SeekIC

Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1 , R2 and C3. VLS is the infrared emission probe which can be used to radiate 40kHz high-frequency externally to form the IR beam. VDL is the infrared receiver probe, and it forms infrared receiver, shaping and amplifying circuit with IC3 (CX20106A), and the infrared signal can be converted into electrical pulses after being amplified. IC4 and its peripheral components form alarm implementation circuit, once pin 2 is in low level, the circuit immediately flips, then the signal output end pin 3 is immediately converted to high level output, and it has delay function at the same time. Usually , VDL receives the infrared beam being radiating by VDL.



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