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Sensitive light control switch circuit
Source: InternetPublisher:傻阿乐 Keywords: Switch circuit light-controlled switch phototransistor Updated: 2020/09/25
The circuit shown uses a Darlington-type photosensitive transistor as a sensitive element, so it is sensitive to weak light and is suitable for
detecting reflected light signals. In the circuit , when the Dalin tilt-type photosensitive transistor is exposed to light, its internal resistance decreases, causing the potential of pin ② to drop, when it drops to U [=c/
3. ③Pin outputs high level, and the relay is released at this time.
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