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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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Amazon.com: 12V DC Power Connector 5.5mm x 2.1mm, CENTROPOWER (10 x Male + 10 x Female) Power Jack Adapter for Led Strip CCTV Security Camera Cable Wire Ends Plug Barrel Adapter : Electronics
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MicroUSB to 5.5/2.1mm DC Barrel Jack Adapter : ID 2789 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Simyoung 3.3FT Male to Right Angled 90 Degree 5.5 x 2.1mm DC 5V Power Plug Barrel Connector Charge Cable 5 Volt DC Barrel Jack Adapter DC to USB Converter - Walmart.com
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