Learning
Introduction
The LM317 is an adjustable 3 terminal voltage regulator which is capable of supplying 1.2 to 37 volts with a guaranteed 1.5A output current. The LM317 is packaged in a standard transistor package which makes it very easy to mount in your circuits.
This site,
LM317 Circuits will teach you how to use the voltage regulator in every day applications and has many useful circuits that you can built.
Learning
Circuits
Once you have learnt enough you can now put the LM317 into use and make the following circuits:
