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Passive Infrared Circuits

Last Updated: October 24, 2017 02:55 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Circuit uses Simple Circuit LED for near-IR light-  09/01/98 EDN Design Ideas:    NOTE:     FILE has many circuits, scroll down.  You can successfully use LEDs as sources of near-infrared light.  However, when you need a source of light with precisely controlled power, a feedback loop is necessary to compensate for the temporal and thermal changes of the LED parameters.  Standard LED types come with neither these monitoring detectors nor an external monitoring photodiode to detect part of the emitted light and generate a feedback signal.  The situation calls for some mechanical fixture to mount the photodiode. __ Circuit Design by Lukasz Sliwczynski, Marcin Lipinski, Institute of Electronics, Krakow, Poland

Good IR Detector-  How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan

Passive Infrared Circuits


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