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PCB copper defect?
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May 21.2019, 17:20:43
I came across an interesting effect on a PCB today. There seems to be small holes or voids in the copper, which at first I thought was micro via stitching, until I remembered it's a single-layer board. The effect is locally uniform, with centres at about 0.25 mm, but comes and goes in patches across the board.
I assume this is a manufacturing defect, but does anyone know the mechanism that causes it?
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