Outdoor light automatic control principle circuit

Published:2011/5/16 22:35:00 Author:Christina | Keyword: Outdoor light, automatic control, principle | From:SeekIC

When you close the power switch S, the 220V city electricity gets to the transformer T1's primary stage through the fuse FU4, and the subprime output voltage (16V) is rectified by the rectifier bridge UR, then it gets through the regulator integrated block IC1, capacitance C1, C2's filters supply the operating power to the control circuit. IC2 and IC3 are the NE555 manifolds, the light control circuit is composed of the IC2 and the external components, the timing circuit is composed of the IC3 and the external components. The light is strong during the day time, so the photoresistor RG's resistance is small, the IC pin-24 reset terminal has the low-level voltage, transistor VT1 closes and the relay K1 cuts off, it's normally open contact points K1-1 and K1-2 cut off too, all the bulbs are not bright. Figure: Outdoor light automatic control principle circuit



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