Automatic floodlight circuit with the two-way thyristor

Published:2011/6/24 23:32:00 Author:TaoXi | Keyword: Automatic floodlight, two-way thyristor | From:SeekIC

The circuit which uses the phototransistor as the illumination sensor is as shown in the figure. When the illumination is strong, the phototransistor and the L14C1 conduct. The diode VD3 conducts to make the voltage of capacitor C2 to zero, the two-way trigger tube VD5 and the two-way thyristor (triac) VT will not conduct, the light will not light. In the night, the L14C1 will not conduct, the voltage of C2 conducts the ST4 and VT, the light will turn on automaticly.



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