Variable DC Power Supply for
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Variable DC power supplies are critical to many electronics projects.  You'll never have to go out and buy dozens of different single-voltage power supplies or battery configurations with this new unit.  Professional units can cost hundreds of dollars, but now you can make one for less than $15!
 <h2>Step 1: The Parts</h2>
<div style=Variable DC Power Supply for <$15
Variable DC Power Supply for <$15
Variable DC Power Supply for <$15
Variable DC Power Supply for <$15
Variable DC Power Supply for <$15
Variable DC Power Supply for <$15
These are the parts you will need:
  • LM317 Voltage Regulator ($0.50)
  • 0.1 uf Mylar Cap (~$0.10)
  • 1 Axial Electrolytic Cap (~$0.20)
  • 220 Ohm Resistor (~$0.05)
  • 5K Potentiometer ($1.00)
  • Cheap Voltmeter ($7.95)
  • Enclosure ($1.65)
  • Power Supply ($2.85)
  • Total Cost: $14.30Not bad for a homemade variable DC power supply!

    Step 2: The Variable Voltage Regulator.

    Variable DC Power Supply for <$15
    Variable DC Power Supply for <$15
    Start by making the variable voltage regulator. Refer to the schematics below.

    Step 3: Adding the Digital Readout

    Variable DC Power Supply for <$15
    Variable DC Power Supply for <$15
    Variable DC Power Supply for <$15
    Adding the digital readout is really simple! Just open up your multimeter and solder your output to the test leads. Add a switch to the battery. And that's it! You're done :D

    Step 4: You're Done

    Test it and have fun! Put it in an awesome enclosure like I did to impress your friends :)
     
     

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