Can we find out about the parts that the arduino uses?
I want to make a shield, and i bought the same power jacks.
And i thought that there would be two pins, one for power, one for GND. However, it has three pins.
The supplier did not have a datasheet, and right now i do not have a continuity beeper either, so could i see its datasheet somewhere, or does anyone know why it has three pins?