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3.8 / 1.3mm or 3.5 / 1.1mm to 5.5 / 2.1mm DC Jack Adapter Cable : ID 2788 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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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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Amazon.com: 12V DC Power Connector 5.5mm x 2.1mm, CENTROPOWER (10 x Male + 10 x Female) Power Jack Adapter for Led Strip CCTV Security Camera Cable Wire Ends Plug : Electronics
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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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50 Pairs 12v Male+female 2.1x5.5mm Dc Power Jack Plug Adapter Connector For Cctv - Connectors - AliExpress
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