Printed Circuit Boards (PCBs) are self-contained modules of interconnected electronic components found in a variety of electronic devices. The circuits are formed by a thin layer of conducting material deposited or printed on the surface of an insulating board that is called the substrate; after which a number of tiny electronic components are placed on the surface and soldered to the interconnecting circuits. PCBs could be single-sided, double-sided, or multi-layered. Clearly as the names suggest, single-sided boards have components on one side of the substrate; double-sided boards have components on both sides of the substrate; and multi-layered boards have a substrate made up of layers of printed circuits separated by layers of insulation. With these basics known, now let us get into the details of how a Printed Circuit Board is manufactured.
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Toroidal coils, first and foremost, are different in terms of shape, when compared to any other types of coils. They are doughnut or ring-shaped coils, which have a doughnut-shaped core, around which wire is wound. The wire is repeatedly taken through the central hole and wrapped back around the outside. It is this mechanism of building the wire-packed core that gives toroidal coils the shape they possess; unlike other coils that are cubic or rectangular in shape. In cubic or rectangular shaped coils, wire is wrapped around a bobbin, having a set of cores fitted through the center and around the outside of the bobbin.