light control switch circuit with photosensitive resistor (LDR)

Published:2011/5/24 0:28:00 Author:John | Keyword: light control switch, photosensitive resistor | From:SeekIC

Where there is light, the transistor with photoresistor LDR in the circuit is connected in high power level or in zero level. The amplification factor of transistor β is sufficient if it is >100. And the resistance of photosensitive resistor would be between the 100Ω ~ 100KΩ. Such is arranged to be respectively corresponding to light irradiation situations and dark conditions. If it is expected to control a higher power load, it should use Darlington transistors.



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