Night automatic light circuit with TRIAC

Published:2011/4/20 2:39:00 Author:Nicole | Keyword: automatic light, TRIAC | From:SeekIC

The circuit is as shown, it adopts phototransistor as illuminance sensor. In daytime with high illuminance, the phototransistor L14C1 turns on. Diode VD3 turns on too, then the pressure drop on capacitor C2 is zero, bidirectional trigger VD5 and TRIAC VT are all off, the light is not on. On the contrary, at night L14C1 turns off, C2 has voltage to make ST4 and VT turn on, the light will light automatically.



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