需求
“A 12 Vac dimmable LED driver with a bridge rectifier, 470 µF smoothing capacitor, 10 kΩ resistor and potentiometer control network, 2N2222 transistor, LED and 10 Ω emitter resistor.”
接著試試Add an input fuse.Change the potentiometer to 50 kΩ.
這張圖裡有什麼
看懂背後的決策。
01
Linear constant-current sink using NPN transistor for stable brightness control
02
Potentiometer in base bias network for analog dimming
03
Full-wave bridge rectifier for AC-to-DC conversion
When you need a simple, cost-effective dimmable LED circuit with few components; avoid for high-power (>1W) LEDs due to heat dissipation in the transistor.