Urgent: Anyone knows how this PIR sensor circuit works at each stage?

Hi, can anyone help me to explain how this circuit works in detail? I need to know how each component works and what happens at every stage of the circuit. The circuit is shown in the link below...

How Infrared Motion Detector Components Work

Help me pls...thanks

Bandpass filter, then rectifier, then comparator, and retriggerable one shot and finally a relay driver.

thanks...but still not clear at which parts of the circuit that these characteristics are functioning...

sodium kumar said:

thanks...but still not clear at which parts of the circuit that these characteristics are functioning...

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Hi

Download the PDF. schematic from that site.Each component is labeled, from that research each component and find the data sheets this will then give you some understanding of what each do and how they might fit in to the circuit.

Example 1C1 A,B,C,D is a Quad op. amplifier while the schematic shows what looks to be like four components is actually only one,well four but in one case. it's shown as four to relate to the pin on the one IC. and how it flows in to the next, each triangle is one amplifier within the one IC. and each as it's own associated pin.

From that you can see what each componant is and what roll it plays in the circuit.Once you have done this and your stuck maybe ask specific questions and build up the flow in your head.


**broken link removed**

wombweller said:

Example 1C1 A,B,C,D is a Quad op. amplifier while the schematic shows what looks to be like four components is actually only one,well four but in one case. it's shown as four to relate to the pin on the one IC. and how it flows in to the next, each triangle is one amplifier within the one IC. and each as it's own associated pin.



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i know this actually...anyway the info given helped alot...thanks...