INFRARED_HOT_ENGINE_DETECTOR_1

Published:2009/7/16 3:25:00 Author:Jessie | From:SeekIC

Hot-engine alarm using only two transistors and an car resets parking meter to zero when lead sulfide infrared detector senses engine heal as parked car starts. Circuit combines Colpitts oscillator with Schmitt trigger.-W. E. Osborne, Farewell To Free Time On City Parking Meters, Electronics, 37:32, p 72.-74.



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