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A mother and her young daughter have been attacked with acid by an obsessed stalker in Spain. The 35-year-old woman, identified as Ana Mari, says she was at her home in the town of Sant Feliu de ...

Such badges are easy enough to make with a CNC machine, but if you don’t have access to machine tools you can put chemistry to work for you with these acid-etched brass nameplates. The etching ...

provided you can etch your own boards and can program the PIC16F1828 microcontroller. All this info is over on the Australian blade forum post he put up, along with a demo video below.