PCB: Double-sided PCBs are commonly found in many electronics used each day.Double-sided PCBs have a conductive layer on each side. While single-sided PCBs have one conductive surface.A dielectric layer is surrounded by circuit copper layers and solder mask on both sides.A ‘green‘ printed circuit board is not actually green all the way through. The only green part is the outer covering of resin called the solder mask or solder resist/oil.
