Card Edge Connectors are professional connectors widely used to establish physical and electrical connections between printed circuit boards (PCBs) and motherboards. Its design principle is based on precise matching and contact between inserts and slots, usually composed of metal contacts arranged on one or both edges of the circuit board. When the circuit board is inserted into a specially designed slot, the metal contacts correspond to the conductive traces on the edge of the PCB. When a PCB is inserted into a connector, the conductive traces at its edges are in close contact with the contacts inside the connector, forming an electrical connection.

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