If board dimensions are kept below 100mm X 100mm, the cost of manufacture and postage is negligible, again coming in at less than £6. After relinquishing control of this small company to another individual, the company appeared to go downhill, but after its demise, Brian generously released the designs he created, including this power supply, into the public domain. The power supply comes courtesy of Brian Bell, former owner of. It cost me less than £6 to get ten amp boards made. Gerber files, the set of files necessary for a PCB lab to manufacture your project are freely available for use and modification here. Although initiated and largely designed by user 00940, there has been some input from others, including advice from Tom Christiansen of Neurochrome, resulting in what should be a good implementation. Luckily, in terms of timing, a recent thread on DIYAudio was concerned with creating an open source PCB layout for the LM3886. I did consider the CircuitBasics boards but the physical size of the PCBs pushed the cost up quite a bit. As much as I would like to have a go at the Neurochrome LM3886DR, the cost of the boards is too much for this project.
With the chip decided upon, a suitable layout was sought. There are a number of good chips for amplifiers and I managed to purchase a pair of LM3886 opamps new for £5 from a seller on DIYAudio a few months ago.
I decided to build an amplifier for a friend.
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