The passive human body infrared sensor circuit

Published:2011/7/8 0:58:00 Author:Seven | Keyword: human body, infrared sensor | From:SeekIC

No matter what kind it is, passive human body infrared sensor circuits are almost the same with the above, maybe some has less stages. This circuit in the figure is got from the NICERA producer, which is classical. The stage of front-end is the low frequency signal amplifier, the magnified times are 100, then the signals pass R6 and C5 before the 0.2-10HZ signal is picked out, finally, the selected signal is amplified by IC1B, the 5-pin of the op-amp is the 1/2VCC voltage pin, when it is static, the voltage on 6-pin and 7-pin is also 1/2VCC.



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