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Amazon.com: ThreeBulls 12 Pieces 5.5mmx2.1mm 2 Pins DC Power Jack Female Panel Mounting Connector Socket : Electronics
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10pcs Dc Power Jack Socket 5.5*2.1mm 5.5*2.5mm Male Female Connector Dc-044 Dc-050 Screw Nut Panel Mount Soldering Waterproof - Connectors - AliExpress
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Female DC Power adapter - 2.1mm jack to screw terminal block : ID 368 : $2.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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