PCB etching instructions
printing your pcb
If you use eagle, you can use the print option (as opposed to exporting an image). Print on normal paper first and check dimensions on some components.
I get best results with acetate, but this needs to be special laserable acetate. Do not use normal transparency! I have melted a sheet onto a fuser before and it was expensive to replace.
Some people get good results with paper instead of acetate.
Make sure your print is the right way round so that your board isn't back to front when it's etched!
5 minutes with acetate and something like 15 with paper. The uv board should look green with faint lighter green traces where your traces are.
pcb etching: developer
Put the board in the developer (tank A), at the moment the heater for the developer is broken so it takes longer than the 30 seconds. What you need to look for is all the copper is exposed when you check it. Only the tracks should be coloured (green with the uv exposure board).
follow instructions on the notice, but the board is done when all the exposed copper is removed. The balance is removing too much copper and getting breaks in traces vs not enough and some small closely laid traces may have bridges.
use the stripper for the specified time then scrub the black off and you should have nice copper traces! Use a multimeter to check for bridges.