In case anyone wants to provide feedback about the third "first board", here are my notes and sample board so far. Yes, a four layer board is overkill, and I'm intentionally shrinking the board more than is needed. This is a tutorial, not something practical :-)
http://www.delorie.com/pcb/gs-smt.png Third board: 555 blinky light again, same schematic. SMT, four layer, internal power planes. New: SMT, layers, vias, thermals, polygon planes. Same basic schematic name GND and VDD nets gattrib: MSOP8 LMC555CMM Nat Semi 0603's PCB: 50mm x 50mm 8/8 rules, 15 mil drill vias 4 layers: component, gnd, power, solder gsch2pcb as usual move parts to solder side position under power jack move to upper left, shrink to 12.5 x 18mm board rectangle tool - gnd plane poly tool - power plane thermals via tool - vias near power/gnd connections, manually route autoroute remainder _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
