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Brightness Control Relay Circuit

2014-11-17 15:23  
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Brightness Control Relay Circuit
As shown in figure is a brightness control relay circuit.Resistance R1, R2 and photoresistance R3 form a divider circuit.When the light isdark to a certain degree,base voltage of VT1 increases,making the VT1 and VT2 connected,and relay J merged.R1 is used for sensibility control.The light-triggered pedestal of this circuit is influenced greatly by voltage and ambient temperature.