Project files: Single voltage regulators

What is it?
These are small single-voltage regulators based on LM317-type regulators suitable for many supporting applications. The output voltage set via two resistors but not variable afterwards.

How big are the boards?
The smaller board measures 1.975×1.425″ (app. 50x36mm) while the bigger board measures 1.975″ (app. 50mm) square.

What is the status of the boards?
The boards are in version 1.1. I have built both version 1.0 and version 1.1 of both and they work fine.

Does it use any special/expensive/hard-to-find parts?
Not really. You can go overboard with low-noise/low-drop regulators and audiophile caps if you feel like it, but there’s no need for that.

Anything else I need to know?

  • The protection diodes (which are not required but still recommended) are MELF-style 1N400x mounted on the bottom of the board. The resistor for the LED is an SMD-type as well.
  • The heat sinks are Fischer SK104 (or equivalent) for the small board and Fischer SK129 (or equivalent) for the larger board.
  • Note that although you can get regulators rated at several amps, the DIP-packaged rectifier bridges are difficult to find in more than 1A ratings (although 2A exist).

Download design files here
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:
Always check the manufacturer’s datasheet for the regulators of your choice to confirm all bypass recommendations, parameters and load conditions. This is especially important if you decide to use low-dropout (LDO) or low-noise types.
Note: Always read the “intro post” for additional important information about my designs.


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