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UNIT 15: PRINTED CIRCUIT BOARDS (PCBs) (This is the original Unit 11, now renumbered as Unit 15. The content is unchanged.) 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

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