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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: Keple 5.5mm x 2.1mm to 3.5mm DC Power Adapter, Nickel Plated, for CCTV Equipment, LED Lights, Notebooks, Audio Video Players : Electronics
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Amazon.com: uxcell 10 Pcs 3.5mmx1.5mm Male to 5.5mmx2.2mm Female Jack DC Power Connector : Electronics
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Amazon.com: Longdex 10 pcs DC Power Adapter 5.5x2.1mm Female Jack to 5.5x2.5mm Male Plug Electrical Socket Outlet for Universal Laptop Interface Power Cable Connector : Electronics
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