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The night lock automatic lamp circuit

2016-08-05 03:34  
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The night lock automatic lamp circuit
When you come back from the outside, it is so dark that unlocking is not unconvenient. As shown in the diagram it is a automatic lamp. When the key touches the door, the small lamp will light up automatically. After getting in the room indoor lamp will light up at the same time. At this time you can easily turn it on, the door lamp will automatically extinguish 20s later. Automatic lamp circuit is as shown in the figure.