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If you own a MacBook, you'll recognize this little friend. The premise of this 2.1mm DC Bar..

This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and conn..

This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminal..

 This adapter allows you to connect a barrel jack connector to bare wires. One end has screw te..

This barrel jack plug is great for adding a common connector to the end of our wires. This jack is c..

There's two standard ways to power electronics - USB or 5.5mm/2.1mm DC barrel jack. This o..