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The Sparkfun Barrel Jack Adapter – USB to 5.5mm is a straightforward cable that converts a USB port to a 5.5×2.1mm barrel connector with a center-positive configuration. This adapter enables the use of a USB port on various devices to supply 5V power to development boards. The USB specification restricts current consumption to a maximum of 500mA, which is sufficient for operating a basic development board. The cable measures 3 feet in length.
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