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The basic stages involved in making a pcb (printed circuit board ) are:
Designing the traces on paper or an autocad style computer application.
Using a transfer or mask to apply a resist to a copper clad board
Spraying or putting the copper clad board into an etching bath of acid.
The etching bath removes the copper that was not protected by the resist.
Washing the etching solution off to stop the process.
Removing the resist that protected the copper.
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