555 light control street lamp switch circuit

Published:2011/5/24 2:53:00 Author:TaoXi | Keyword: light control, street lamp, switch circuit | From:SeekIC

As the figure 17-29 shows, the light control is composed of the step-down rectifier circuit, the photoconductive resistance RG and the photoelectric conversion circuit. The Schmitt trigger circuit is composed of the 555 and the RG，RP.etc. RG receives the light, so it has the low resistance about dozens of thousands of ohms; when there is no light, RG has the high resistance about dozens of megabytes of ohms. So in the daytime, pin-6 of 555 has the high electrical level, 555 resets, J releases, the street lamp H turns off; at night, RG has the high electrical level, 555 sets, J closes, the street lamp H turns on.RG uses the Cds photoconductive resistance, also it can use the phototransistor.



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