情境
A simple phototransistor circuit for detecting ambient light levels. The phototransistor, sensitive to light, turns on with illumination, causing the output voltage to drop.
這張圖裡有什麼
看懂背後的決策。
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.