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MAKE subscriber S1axter, of myBitBox, has put together details on building a basic, filtered 5v power regulation unit based on the ubiquitous LM7805 voltage regulator. You can either build it out of a handful of parts you can get at your local electronics shack, or buy a little kit he’s put together.

Standalone Voltage Regulator


Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.



  1. Dave says:

    Not bad, but the 7805 regulator needs a penny heatsink. :*)


  2. The Oracle says:

    Add a transformer and heatsink, put it in a nice box with 5-way posts, make a set of them at different voltages, and that’s what my dad made about 35 years ago and I still use sometimes to this day.

  3. Kim says:

    and wants its 7805 back.

    There are switching regulators out there, so use them.
    e.g. LM2576 T-ADJ: 3A, 1,23 – 37V, 45Vs, TO-220-5
    Additional external components needed are more or less 2 inductors. The datasheet has lots of suggestions on how to build different versions.