Sensitive photoswitch circuit composed of phototransistor

Published:2012/8/20 0:57:00 Author:Ecco | Keyword: Sensitive photoswitch , phototransistor | From:SeekIC

As shown in the figure, the circuit uses Darlington phototransistor sensing elements, so it is more sensitive to low light. It is suited to the detect the reflected light signal. After Darlington photodiodes in the circuit get light, its internal resistance is reduced, so that the potential of pin 2 drops, when it is reduced to (1/3) Vcc, the output of pin 3 is in high level, then the relay releases.



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