The passive human body infrared sensor circuit

  
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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 s..
The passive human body infrared sensor circuit - schematic




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