PIR module circuit

Could some electronics guru please help ? Standard PIR modules (e.g., BS1600 or BS1700) are somewhat expensive for what they do. Could someone please direct me to a circuit diagram for any of these modules. Thanks in advance for your help.

Reply to
Loading thread data ...

They're usually wired straight to a small JFET with a 1-meg resistor on the gate. The source of the JFET is AC-coupled into a comparator, or whatever was cheapest on that particular day.


Phil Hobbs

Dr Philip C D Hobbs 
Principal Consultant 
 Click to see the full signature
Reply to
Phil Hobbs

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.