Dimmer: pot drives LED
4 parts
A potentiometer wiper feeds the LED's series resistor, so turning the knob moves the drive voltage and the LED's current follows. Because an LED's current depends exponentially on its forward voltage, the brightness change is far from linear in the knob.
- V1 9V
- POT1 2kΩ·50%
- R1 220Ω
- LED1
