He can crank out a 6/6 mil double-sided PCB in 45 minutes flat ... conductive surface—the walls of holes drilled in a sheet of copper clad–conductive. While there are some established ways ...

At the end of the day, PCB etching is all about removing copper from a board in as controlled a fashion as possible. PCB etching methods generally fall into one of two broad categories ...

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This particular innovation, where a PCB is packed with stepped circular or rectangular copper coins, is headed to markets where even the best air coolers are impractical – like miniature devices ...