Where a friend of mine works at a French university the old camera they've used for 20 years for making PCB artwork from 2 1 masters has just died on them, so he asked me for details of my photoetch process using a cheap HP inkjet printer to produce the transparencies. I've just made a test PCB for him with 8/8, 10/10 and 12/12 mil tracks, four of each in two groups. They all came out OK, and the lettering on the board which used a 5 mil line width was also reproduced perfectly. He'll check the track widths with a measuring microscope, but they look fine under 14x magnification apart from the edges being a bit rough with no sign of overetching. They are thinking of spending a lot of money upgrading their PCB facility with PTH and a laser plotter, but knowing how slowly things move over there it'll take at least a year, and my method might get them out of a hole. Leon -- Leon Heller Amateur radio call-sign G1HSM Yaesu FT-817ND transceiver Suzuki SV1000S motorcycle leon355@... http://www.geocities.com/leon_heller
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Test of my photoetch process
2008-04-11 by Leon