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light control switch circuit with photosensitive resistor (L

2014-11-27 12:31  
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light control switch circuit with photosensitive resistor (LDR)
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.