Making PCB(Printed Circuit Board) by Laser Engraving

Use the laser to expose the unneeded parts of a positive acting presensitized PCB in a dark room. 

Immerse it into the developer for a while, then remove and wash it. Etch it with ammonium persulfate solution.

This is one of the easiest way to create PCBs, and the result is quite satisfying!

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