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Pololu

$3.35 |
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This connector adapts a 5.5 × 2.1 mm DC barrel jack to a pair of screw terminals spaced approximately 5 mm (0.2″) apart. The terminal...

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This connector adapts a 5.5 × 2.1 mm DC barrel jack to a pair of screw terminals spaced approximately 5 mm (0.2″) apart. The terminals are labeled positive and negative, with the positive terminal connected to the center pin.

Jargon buster

Plain-language definitions for the technical terms used above.

DC barrel jack
A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
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