Questions of double Sided Pcb?
I have a few questions of manufacturing PCB two layers PCB:
1.Before printing, what should I do? Mirror the image of top layer?
2. How exactly do I make a via?
3. What's the best way to align the sides well for vias matching?
4.Is there some kind of coating that I can put over the board after soldering everything, so that a stray piece of metal falling on the board won't cause a short circuit?