555 simple light controller circuit

Published:2011/5/21 7:25:00 Author:TaoXi | Keyword: simple, light controller | From:SeekIC

As the figure 17-38 shows, this circuit uses the 555 as the core, and the RS trigger circuit is composed of the 555, the photosensitive tube (3DU type) and the RP. At night, the resistance between 3DU tube's c electrode and e electrode is so large, pin-2's potential closes to the ground potential, 555 sets, pin-3 has the high level voltage, and the light turns on; during the day, there is the illumination, so the resistance between 3DU tube's c electrode and e electrode reduces, pin-6's voltage exceeds the threshold level 2/3VDD, 555 resets, the light turns off.



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