Homemade PCB

Short film about how to make double sided pcbs with good layer alignment using lithographic technology at home. Two things are still missing: copper plating of the vias, and lithographic method for solder mask. The process last arround 34h, and the result is very satisfying One more trick for the Positiv20: Many people struggle (included me also) how to apply the Positiv20 to form an uniform layer, some times, no matter how clean the board was. I found out some way to do it rig