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The grating circuit using transistor circuit

2016-05-08 21:19  
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The grating circuit using transistor circuit
When the light on photosensitive element is interrupted, the circuit's relay operates. The photosensitive element and 100kΩ resistor form a voltage divider, thereby controlling the transistor base potential. When light is exposured to it, it is in a low-resistance state, the transistor base potential is very small. Conversely, when the light is blocked, the potential is increased, thereby causing the Schmitt trigger flip, the output stage power transistor is turned on, then relay operates.