Led Driver Circuit Using Transistor. Pictured below is a very basic circuit incorporating a transistor. One typical circuit topology used to drive leds is the linear topology in which the transistor operates in the linear region.
In this tutorial we are going to make a simple led driver circuit. This circuit is used to drive different kinds of high power leds of different watts. This is a simple diy project using an lm317t ic and a few passive components.
In this tutorial we are going to make a simple led driver circuit.
The circuit is constructed on a breadboard as shown below. Lm317t is a voltage regulator ic whose output can be varied using an external resistor. This circuit is used to drive different kinds of high power leds of different watts. Led current in amps 1 25 r3 so for a current of 550ma set r3 to 2 2 ohms you ll need a power resistor usually r3 power in watts 1 56 r3 this circuit also has the drawback that the only way to use it with a micro controller or pwm is to turn the entire thing on and off with a power fet.
