There are three principles of LED dimming:
- Pulse Width Modulation (PWM, for short)
Digitize the power square wave and control the duty cycle of the square wave to achieve the purpose of controlling the current.
- Constant current power supply control
The size of the current can be easily adjusted using analog linear technology.
- Group control
Group multiple LEDs and control them with a simple grouper.
The above two methods (1.2) can use an adjustable resistance knob for stepless control. But the adjustable resistance is not so reliable, so it is possible that the light will flash when adjusting the light.
More reading: About LED Light Assembly You Have to Know
