Across The Track Infrared Detectors

  
This page presents information on infrared - `Across The Track` train detection circuits. The circuits are designed around the LM339 comparator chip and can use a wide assortment of matched infrared - emitter / detector pairs. The basic circuit shown below has been tested with sensor gaps as wide as 12 inches but a distance of 8 inches or less is more practical.
Across The Track Infrared Detectors - schematic




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