LED Brightness Control using Potentiometer

Components Required:

1) Breadboard

2) 1N4007 Diode

3) 470 ohm resistor

4) 100 Kilo ohm Potentiometer

5) LED (Any Color)

6) 9Volt Battery

7) Digital Multimeter

Procedure:

• Connect the 1N4007 diode and 470Ω resistor to one fixed terminal of 100 Kilo ohm Potentiometer in series. Connect the variable terminal of potentiometer to the LED in series in a breadboard. 

• Connect the 9V battery's positive end to the anode of 1N4007 diode and negative end to the cathode of the LED as shown in the circuit diagram below.

• Measure the voltage across various points by altering the potentiometer value using a digital multimeter and note the change in brightness of the LED accordingly.

Circuit Diagram:

   

Figure 1: LED Brightness Control using Potentiometer Circuit simulation made in Multisim

 

Figure 2: LED Brightness Control using Potentiometer (100% Brighrness)

Figure 3: LED Brightness Control using Potentiometer (50% Brighrness)