![]() The whole process is described in this article with downloadable schematics and code at the end. ![]() This has now become a reality thanks to two significant improvements: laser engraving and a rocking etching tank. Over the last 10 years I've been experimenting with various techniques that can significantly shorten the time needed to go from an idea to an actually working board, ideally done the same day for week-end projects. With SMDs becoming more and more common, pencil is difficult to use for precision work, wasting a lot of time trying to route and adjust PCBs by hand and making marks on the board using needles through paper, which was not great. ![]() 10 years later I bought a kit with an UV table, the ferro-chloric acid tank with bubbles and heating, and presensitized copper, but found it very difficult to use for occasional week-end projects and continued to work with the pencil. I started making my own PCBs at the age of 10, using a pencil on PCB.
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