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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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10 Male and 10 Female 12v DC Power Jack Adapter Connector for Led Stri – Creative Security Technology
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Amazon.com: DIKAVS Breadboard-Friendly 2.1mm PCB Mounting Female DC Power Barrel Jack (Pack of 10) : Electronics
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