Light control relay circuit

Published:2011/6/8 7:03:00 Author:Christina | Keyword: Light control, relay | From:SeekIC

Use the photoconductive resistance as the photoelectric switch circuit, the sensitivity of it is very high, the light control relay circuit is as shown. When the illumination intensity is low, the VT will not conduct; when there is a certain illumination intensity, the resistance of the photoconductive resistance will be small, VT gets enough base current to conduct, so it produces the large collector current to close the relay.



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