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UNIT 11: PRINTED CIRCUIT BOARDS (PCBs) INTRODUCTION A printed circuit board (PCB) holds and connects electronic components. It replaces wires with copper traces etched onto an insulating board. Almost all modern electronics use PCBs. STORY 1: What is a PCB? A PCB is made of a non-conductive material (usually fiberglass) with copper layers on top and bottom. The copper is etched to create traces. Components are soldered onto pads. Holes called vias connect different layers. PCBs can be singl

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