This is a short instructional for modifying a DC laptop brick to make an adjustable voltage output using the LM317 IC.
For schematics, please google "LM317 datasheet." I will only describe the build process in general terms.
Step 1: Mini benchtop power supply
This instructional modifies a laptop DC brick to make a slick, breadboard-friendly power supply for all your low-powered projects.
It contains one thru-put, and two, independently adjustable voltage outputs. The circuit uses an LM317 for each of the adjustable outputs. Best of all, it outputs thru a breadboard power strip!
You will need a multimeter in order to accurately adjust the voltages. But you already have one, don't you? You can see my "pen" multimeter hanging in the back.