Breadboard-friendly 2.1mm DC barrel jack : ID 373 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Conwork 10-Pack 5.5mm x 2.1mm Male DC Power Plug Jack Solder Connector Adapter : Electronics
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2.1mm x 5.5mm Barrel Type Male DC Power Jack Adapter Connector
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DC Power Barrel Jack Adapter Plug Socket Connector 1.35mm 1.7mm 2.1mm 2.5mm CCTV | eBay
DC Barrel Plug Conversion Adapter
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DC connector - Wikipedia
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Pololu - DC Power Adapter Barrel Jack
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DC Power Cables - Mojo Audio
DC POWER ADAPTER 5.5x2.1mm Female Jack to 3.5x1.35mm Male Plug - TDI, Inc
