Datasheet

Flip over the two pieces so they are resting on the black
header.
With your soldering iron heated up to 700 degrees F,
and some solder, heat up each ring/pin pair for 2
seconds, then poke the end of the solder in to melt it in
and make a strong electrical and mechanical
connection. Then pull the solder away. Finally remove
the iron.
Repeat for all 26 pins!
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