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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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EV-DJ01FSCR Female DC Power Plug Jack Adapter CCTV Power Cable Female Socket 5.5mm x 2.1mm Evertech USA
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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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