This circuit consists of a conventional sensor found in a 1980 documentation in which an H switch was added to change its function. With this, the sensor can be used as a light alarm or no light alarm. In the second function, it can be used to detect the passage of a person between a lamp and the sensor, as in professional systems used in banks. The author suggests that the article in the book Experiences and Jokes with Electronics volume 3 - be consulted for more information on assembly, use and adjustments.
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