상황
A simple phototransistor circuit for detecting ambient light levels. The phototransistor, sensitive to light, turns on with illumination, causing the output voltage to drop.
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01
Use NPN phototransistor with open base for light sensitivity.
02
Emitter resistor converts current to voltage output.
03
Decoupling capacitor filters noise.
Used in light-activated switches, ambient light sensors, and optical detection applications.