Introduction

This experiment demonstrates how to use the LM317 adjustable voltage regulator to control the voltage supplied to an LED, allowing you to adjust its brightness.

Materials Required

• LM317 Adjustable Voltage Regulator
• LED
• Resistors
• Power Supply
• Breadboard and jumper wires

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Circuit Diagram

The LM317 is used to provide a variable output voltage to the LED, controlling its brightness by adjusting the regulator's output voltage.

Steps for the Experiment

1. Assemble the LM317 circuit with a variable resistor to set the output voltage.
2. Connect the LED to the output of the LM317.
3. Adjust the output voltage and observe the change in the LED's brightness.

Explanation

The LM317 allows precise control over the voltage supplied to the LED, which in turn controls its brightness based on the input voltage.

Results and Observations

• The LED's brightness should change as the output voltage of the LM317 is adjusted.