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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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5.5 / 2.1mm Barrel Connector - DC Power Plug : ID 3310 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Panel Mount 2.1mm DC barrel jack : ID 610 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Coax Barrel Plug Adapter from 2.5mm to 2.1mm Power Plug by Creative Lighting Solutions LLC : Electronics
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5.5*2.1MM DC Barrel Jack Adapter - Female [5.5*2.1MM-DC-Female] - US $0.40 : HAOYU Electronics : Make Engineers Job Easier
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