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Breadboard-friendly 2.1mm DC barrel jack : ID 373 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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10pcs Dc Jack Dc Power Connector Pin 2.1x5.5mm Female Plug Jack + Male Plug Jack Socket Adapter - Connectors - AliExpress
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Amazon.com: RuiLing 10-Pack 5.5X 2.1mm DC Power Female Jack Panel Mount Connector with Hex Nut 3 Pin DC Electrical Plug Socket Connector : Electronics
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