the pins are soldered – otherwise strain will be put on all the soldered joints as soon as
the nuts are torqued up, resulting in unreliable connections later.
Edge connectors
Edge connector systems are popular with many designers because they are relatively
cheap. In this case, the connector “finger” pattern is part of the pcb layout at the board
edge, and the board itself plugs into a single-piece female receptacle on the mating part.
The board should have a machined or punched slot at some point in the pattern which
mates with a blanking key in the receptacle, to ensure that the assembly is plugged in
the right way ...
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