A solicitação
“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.”
Depois, tenteAdd an input fuse.Change the potentiometer to 50 kΩ.
O que há neste desenho
Entenda as decisões por trás dele.
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.