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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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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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Amazon.com: HiLetgo 10pcs DC Power Supply Jack Socket Female Panel Mount Connector 3-Pin 5.5 x 2.1mm : Electronics
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Panel Mount 2.1mm DC barrel jack : ID 610 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 5.5MM x 2.1MM 10Pack Male DC Power Plug Power Jack Adapter Connector&5.5MM x 2.1MM Female Dc Power Jack 3Pin Panel Mount Connector&10Pack Dustproof Plug, Lsgoodcare : Electronics
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Amazon.com: Lsgoodcare 5.5 x 2.1 MM 5A DC Power Jack Socket Threaded Female Mount Connector Adapter with 3.94Ich 20AWG Cable + DC Barrel Jack Plug Male (5.5 x 2.1 MM) : Electronics
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Anderson Powerpole : 2.1mm x 5.5mm Female DC Power Jack to Powerpole Adapter SDC21ST by www.valley-ent.com
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Amazon.com: lkelyonewy 5.5 x 2.1 mm DC Power Jack Socket Threaded Female Panel Mount Connector Adapter with Dustproof Plug 6Pack : Electronics
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