Project files: Regulated PSUs – part 2

What is it?
These are variable-voltage regulated power supplies based on LM317/LM337(-type) regulators. These are useable for a wide variety of applications. You can use normal LM317-regulators or substitute higher-current LM350/LM338 or low-dropout LM/LD/LT108x types as the boards only use positive regulators. There are two basic versions, one version using small heat sinks (Fischer SK104-style) and one using larger heat sinks (Fischer SK129-style). Both boards are available in single and dual versions.

How big are the boards?
Small boards:
– single version 3.6×1.175″ (app. 91x30mm)
– dual version 3.6×2.25″ (app. 91x57mm)
Large boards
– single version 3.925×1.75″ (app. 100x44mm)
– dual version 3.925×3.5″ (app. 100x89mm)

What is the status of the boards?
These boards are in version 1.0. I have built and tested both dual versions and they work well. The single versions are exactly identical and should work perfectly also.

Does it use any special/expensive/hard-to-find parts?
No, all these parts are reasonably standard.

Anything else I need to know?

  • The heat sinks on these boards are not that big, so remember to watch the power dissipation – especially if the regulator needs to drop a large voltage.
  • These designs assume you are at least somewhat familiar with how the LM317-type voltage regulators function and operate.
  • Always check the manufacturer’s datasheet for the regulators of your choice to confirm all component values and load conditions. This is especially important if you decide to use low-dropout (LDO) or low-noise types that could have slightly different parameters.

Download design files here (large boards)
Download design files here (small boards)
For a small spreadsheet that can be used to calculate resistor values, output voltages etc. for the regulators, see the “download” page (or google to find an online calculator)

Related information:
Note: Always read the “intro post” for additional important information about my designs.


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