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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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Breadboard-friendly 2.1mm DC barrel jack : ID 373 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Screw Locking 2.1MM x 5.5MM DC Power Connector Female Plug & Metal Panel Mount Socket Locable Secure Standard Plug Socket - - Amazon.com
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