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.
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