http://www.geocities.com/pdmtr/
A shareware package using CorelDRAW as a printed circuit board (PCB) layout program.
http://www.geocities.com/MerliPCB/index.html
A very good Prototyping / Breadboarding Tutorial with lots of do's and don'ts.
http://www.williamson-labs.com/480_prot.htm
Printed circuit boards are usually manufactured by chemical etching (with iron (III) chloride or ammonium persulfate, for example). This is not very practical if only a few boards are necessary, because these etchants are messy and somewhat dangerous.
http://cq.cx/pcb-router.pl
http://www.emclab.umr.edu/pcbtlc/
with wire parameter, RMS value calculator & SMPS note
http://www.geocities.com/CapeCanaveral/Lab/9643/index.htm
http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm
making of the Printed Circuit Board(PCB)
http://www.hobby-elec.org/e_pwbm.htm
In the electronic circuits making, the electronic circuit is stored in the case.
http://www.hobby-elec.org/e_acryl.htm
silver plating by the Cool-Amp as the Eliminate Oxidation of a printed board.
http://www.hobby-elec.org/e_pwbm5.htm