Project files: LM3875 Gainclone and PSU

What is it?
These are the board files for the LM3875-based Gainclone amp and matching PSU described here.

How big are the boards?
Both boards measure 3.925″x1.5″ (app. 10 x 3.8cm)

What is the status of the boards?
The boards are both in version 1.2. I have built version 1.1 of both and corrected a couple of minor mistakes in the layout afterwards.

Does it use any special/expensive/hard-to-find parts?
Not really. The layout is quite tight though, so remember to check the fit/dimensions of your components before ordering.

Anything else I need to know?

  • Because I couldn’t get the ICs closer to the edge of the board I recommend that you use the LM3875TF (the isolated version) to be able to mount it flush against the heat sink.
  • The big caps on the amp board are supposed to be 18mm in diameter, but the two middle ones are so close together that 16mm caps are preferred instead.

Downloads:
Download design files here

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

You can find additional information about the LM3875 gainclone in the LM3875 build guide over at audiosector.com.

gc3875-1

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2 Responses to Project files: LM3875 Gainclone and PSU

  1. Pingback: Project files: New gainclones | theslowdiyer

  2. Pingback: A Smaller Gainclone… | theslowdiyer

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