Project files: BUF-03 stereo buffer

What is it?
This is the board for the BUF-03 based stereo buffer described here. The board is a stereo buffer that can be used as a preamp or headphone amp. The board requires a dual, regulated 12-15VDC power supply capable of supplying at least 150mA.

How big are the boards?
The board measures 2.55×1.45″ (app. 65x37mm).

What is the status of the boards?
This board is in version 1.0. It has been prototyped and tested without any errors found.

Does it use any special/expensive/hard-to-find parts?
Yes. The BUF-03 IC was discontinued several years ago and is not easy to get. They are often available as used or NOS on ebay, but as always be wary of the risk of counterfeit/substandard parts in ebay listings.

Anything else I need to know?

  • DO NOT attempt to use this board with the BUF634 or any other buffer IC as that will not work.
  • The BUF-03 ICs are internally biased to class A and will get (quite) hot during normal operation. Small TO-5 heatsinks are recommended if you can find them.
  • The board can be used with the (equally hard to find) BUF-04 from Analog Devices, as long as you note the different pinouts (different location of the DC offset adjust pins).

Download design files here

Related information:
See the links referenced in the original blogpost for build articles etc.
Note: Always read the “intro post” for additional important information about my designs.



2 Responses to Project files: BUF-03 stereo buffer

  1. Pingback: One amp to rule them all? | theslowdiyer

  2. Pingback: Project files: BUF-03 revisited | theslowdiyer

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