The M³ stereo headphone amplifier

The circuit board

The M³ circuit board is made of high quality FR-4 glass epoxy, double-layer with plated-through holes as well as silkscreen and solder mask. The copper layers are 0.5 ounce with an additional 0.75 ounce of plating, totaling 1.25 ounce. The result is a copper thickness of approximately 0.0017".

The following diagram illustrates some important board dimensions. It can be used as a reference when you work on the chassis enclosure.

 

The circuit board layout is shown below. It is not in actual size. The top layer is shown in red, the bottom layer is in blue, areas where there are traces in both the top and bottom layers are in lavender, and the top silkscreen is in light grey.



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