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A circuit board or more precisely a printed circuit board (PCB) is a mechanical structure that provides support for mounting electronics and electrical components and connecting them with conducting traces or wires.

PCBs are designed to perform a specific electrical or logical function. So what and how a circuit works will depend on its design. e.g. a circuit board in a TV processes audio/video TV signals. An audio amplifier circuit board amplifies and makes audio signals louder. Similarly various circuit boards in a Personal Computer perform different functions e.g. PC mother board, TV tuner card, USB/Firewire Card, Graphics cards are all circuit boards and perform different tasks. All of them need power (typically a DC voltage) for various components and circuits to work.

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