1 Photocopy, or laser print the artwork onto overhead projector film unless you already have reverse artwork.
2. If you use the the projector film, it over as needed to get a reverse image on the blue Press N Peel transfer film.
3. You may have to tweak the copier's toner for a dark image, and it might be a just a bit off scale, if that matters much.
4. The circuit board should be a bigger than the PCB pattern to help fix any misalignment problems.
5. Clean the circuit board with something like a Scotch Brite pad, and wash well with alcohol to get rid of any oils or finger prints.
6. Hold the board by it's edges and align the PNP pattern on the board properly, taping one edge to keep it in place
7. If you have a pouch laminator, run the board and film, with the taped edge leading,through using a pouch carrier.
8. Without a laminator, you can iron it on with a clothes iron. Put a few sheets of paper on top of the film to keep it from slipping.
9. The toner on the film will get sticky when hot, and bond to the board. Allow the board to cool, or rinse in cold water.
10 If the board is missing a bit of a trace, choose to do it over, or repair the damage with a Sharpie marker.
11. Acetone will remove the pcb pattern from the board so it can be reused if necessary, but clean it again.
12. Etch in any available etchant, I prefer amonium persulfate since it is less mess.
13. After etching, I leave the PNP pattern on until the drilling is done, then clean it with acetone but you can clean it first if desired
Overhead film is available on online and maybe the big box office stores still carry it (who uses overhead projection any more?).
PNP Blue film comes with an instruction sheet and it is available online, and from several electronic supplier that also supply the
copper board and etchants. Look online, it's there as well as several videos showing the process.
This PNP process is great for a not too complex board prototype, but not for quantities. You can have a board from artwork to drill in an hour,
correct your mistakes and go again without waiting for a board house turnaround and cost.
Good luck!
NOTE: Anyone have a simple method for PTH? (Plated Through Holes).Wire jumpers, are hard to do with high density connectors !