The infrared burglarproof alarm circuit

Published:2011/7/1 22:51:00 Author:Borg | Keyword: infrared, burglarproof alarm | From:SeekIC

In the figure is the infrared burglarproof alarm circuit. The alarm includes the infrared pulse emitter and receiver, the decoder and alarm stereo circuit, and the emitter and receiver are installed on the same metal base. The emitter is a multi-resonance oscillator composed of 4 NAND CD4011 with two input terminals, whose oscillating frequency is decided by W1 and C1, the frequency corresponding to the figured parameters is about 1～15kHzm, the oscillating signal is turned into the infrared pulse signal after it is driven by BG. The infrared receiver and decoder includes the infrared light-electricity converter and so on.



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