Computers consist of one or more boards, often called cards or adapters. Circuit boards fall into the following categories (you can also have custom circuit board):
Motherboard: The principal board that has connectors for attaching devices to the bus. Typically, the mother board contains the CPU, memory, and basic controllers for the system. On PCs, the motherboard is often called the system board or mainboard.
Expansion board: Any board that plugs into one of the computer's expansion slots. Expansion boards include controller boards, LAN cards, and video adapters. Daughtercard: Any board that attaches directly to another board.
Controller board: A special type of expansion board that contains a controller for a peripheral device. When you attach new devices, such as a disk drive or graphics monitor, to a computer, you often need to add a controller board.
Network Interface Card (NIC): An expansion board that enables a PC to be connected to a local-area network (LAN).
Video adapter: An expansion board that contains a controller for a graphics monitor.
Printed circuit boards are also called cards.
Laminates are manufactured by curing under pressure and temperature layers of cloth or paper with thermoset resin to form an integral final piece of uniform thickness. There is plenty of multilayer PCB design. The size can be up to 4 by 8 feet (1.2 by 2.4 m) in width and length. Varying cloth weaves (threads per inch), cloth thickness, and resin percentage are used to achieve the desired final thickness and dielectric characteristics.
Excluding exotic products using special materials or processes, all printed circuit boards manufactured today can be built using the following four items which are usually purchased from manufacturers: Laminates, Copper-clad laminates, Resin impregnated B-stage cloth (Pre-preg), and Copper foil.
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