On 7/15/2012 6:21 PM, Ruben J=F6nsson wrote: > keep traces at least 12 mil thick but can go as low as 8-9 mils. > Diagonal traces seems to be a bit thinner when printed. My biggest problem with really small traces is the board quality needs=20 to be good. I can etch the traces fine, but then when I go to solder the=20 boards I have had problems where the traces peel from the board. > > > The boards are then washed and coated with a protective varnish that also > contains flux (SK10). Another thing that you can use and is very easy to get is sharpie=20 permanent markers. I use the ones that come in various colors, mainly=20 red and blue. It dries almost instantly and you can color different=20 traces to better mark things like power or data traces. To remove it if=20 you make a mistake you can use acetone and it wipes away clean. It also=20 doesn't seem to interfere with flux and solder as I haven't had to=20 remove any when soldering. > > > > Here are links to pictures of my latest board which is based on a > PIC24FJ256GB106-I/PT (64 pin TQFP with 0.5 mm pitch). > > > > /Ruben > Those are some nice looking boards. I think photo etching is the way to=20 go and I wish more people would give it a try as the process is really=20 much better than toner transfer. Mark --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .