Socket Design
Edge connector sockets consist of a plastic "box" open on one side, with pins on one or both side(s) of the longer edges, sprung to push into the middle of the open center. Connectors are often keyed to ensure the correct polarity, and may contain bumps or notches both for polarity and to ensure that the wrong type of device is not inserted. The socket's width is chosen to fit to the thickness of the connecting PCB.
The opposite side of the socket is often an insulation-piercing connector which is clamped onto a ribbon cable. Alternatively, the other side may be soldered to a motherboard or daughtercard.
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