Shanghai Nicera human body infrared sensor circuit diagram

Published:2014/2/23 20:51:00 Author:lynne | Keyword: Shanghai Nicera human body infrared sensor circuit diagram, | From:SeekIC

The front of the low frequency signal amplifying circuit level, is about 100 times magnification, the amplified signal through R6, C5 0.2-10HZ signal selected again, and finally to re IC1B amplifies the op amp is 5 feet 1/2VCC voltage pin, when static, 6 and 7, the voltage is also 1/2VCC, when there is a signal, the pin 6 will have a voltage swing up and down around 1/2VCC voltage value, the voltage is further amplified by the op amp, input to the threshold comparator circuit behind the threshold circuit input signal whether you are under partial or biased in 1/2VCC voltage exceeds the threshold value will be in the cathode of the diode 4148 outputs a high level signal. RP1 and RP2 can adjust the sensitivity of detection, the general RP2 can be used instead of a 220K resistor, as long as regulation RP1 it.



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