substrate, copper, substrate, copper, etc.; each layer of copper is etched and any internal sleepers (which will not extend to both outer surfaces of the finished multilayer board) are plated before the layers are laminated together. FR-4 epoxy glass is the most common imprimat multilayer circuit insulating substrate. Flexible-Rigid
components are assembled multilayer imprimat circuit by their legs passing through the board and glued to the pads on the other side. "SMD" components are soldered on the same side of the board. A board can use both methods for soldering components. Today PCBs with components mounted only
color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that can help users during assembly. It is used to mark component multilayer imprimat circuit values, part numbers, test points, polarity, etc. Screen printing does not influence the printed circuit and the