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PWRJACK
Olimex power jack
The standard power supply jack used in most of the OLIMEX boards has positive voltage in the inner pin:
The inner pin of the female jack has diameter of 2.5mm. The exact part name of the female jack that we use is YDJ-1136.
The corresponding power supply plug (or male jack) that fits the YDJ-1136 is AP353B. It has external diameter 5.5 mm and inner diameter 2.5 mm as shown in the picture below: