Dave N6NZ wrote: > DJ is.... um..... unique? yes, that's the word... :) 6/6 and 4 layers > at home is unusually aggressive. For my part, it's just not worth the > hassle to keep the soup around and spend the time doing that... too many > other things I'd rather do. > > -dave
I like to keep etchant around -- I use CuCl2 + 2HCl --> H2CuCl4 etchant replenished by H2O2 and HCl as needed. You can make a quick board for a small number of parts and wires for a power handling equipment chore with a sharpie pen. I do my 10/10, (with some 8/8 footprints and local zones), one layer designs myself first, then send out. That kind of etchant is mild on your clothes and skin compared to ferric chloride. The HCl to use is 35% (swimming pool stores), the H2O2 is 35 % (hydroponics supply store). It's slower, but possible to just use air and a fish tank bubbler to activate the solution instead of H2O2. Add HCl to get emerald green -- yellow green is too much -- on the edge of releasing chlorine gas. Add H2O2 to lighten spent solution. If H2O2 is not enough to lighten, add HCl also. The solution volume grows with use. Anytime you want to stop and avoid pollution, you just add OH- (lye) to get a pH of 9 and all the metal precipitates to oxide that you can sell and clean water. And if you stay with one copper laminate layer, you can send boards to a high volume fab like Yukshing Circuits that prints carbon and silver ink jumpers for the 2nd conductive layer where needed. John Griessen -- Ecosensory Austin TX _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
