9V to Barrel Jack Adapter [discontinued]
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£1.40
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This simple cable has so many uses! Plug a 9V battery into one end and connect the other end to anything with a 5.5x2.1mm centre-positive barrel jack.
Use this cable to battery-power any device that needs 9V and has an onboard barrel jack - it works great for Arduinos, development boards, evaluation boards, and more!