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3.5mm / 1.1mm to 5.5mm / 2.1mm DC Jack Adapter : ID 4287 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: iGreely DC 5.5mm x 2.1mm Power Female Plug Cable with DC 8mm Adapter for Portable Generator 14 AWG Wire 3.3ft/1m : Patio, Lawn & Garden
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Amazon.com: DC to DC Cable,3FT 18AWG DC 5.5MM x 2.1MM Male to Male Plug Power Adapter Cable for LED, CCTV, Car, Monitors,etc(2 Pcs) : Electronics
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Dc Power Socket Jack Connector Adapter 5.5 Mm X 2.1mm / 5.5 Mm X 2.5mm / 3.5 Mm X 1.35mm Female Plug Adapter - Connectors - AliExpress
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Amazon.com: 5Pcs 5.5mm x 2.1mm DC Power Supply Jack Socket Female Panel Mount Connection,dc-022B dc Jack with Wires : Electronics
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Amazon.com: DC Power Pigtails Cable,3FT DC 5.5MM x 2.1MM Male Plug to Bare Wire Open End Power Wire Supply Repair Cable,16 AWG Barrel Connector Pigtail for CCTV Security Camera,DVR,LED Strip Light Etc-2
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DC 5.5 * 2.1 mm Power Jack USB Type-c 5.5mm *2.1mm / 4.8 * 1.7 mm & Micro USB For iphone male plug DC Power Connector Adapter - AliExpress
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