Eye-care Lamps (the 4th)

Published:2011/6/6 5:25:00 Author:Felicity | Keyword: Eye-care Lamps (the 4th) | From:SeekIC

Work of the circuit The circuit consists of power switch S, rectifier diode V1-V4, resistor R1-R3, light-sensitive diode VD5 and light EL (It is showed in picture 9-71.). When you turn on the power switch S the 220V AC voltage is limited and reduced by EL. The voltage separates into two parts. One is supplied to the poles of VT while the other one supplies DC voltage to relaxation OSC and makes EL work. When the environmental light is strong light of ELbecomes weak. When the environmental light is weak the light of ELbecomes strong. Change the value of RPand you canmake the change smoothly without shining.



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