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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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Amazon.com: JacobsParts Barrel Jack to USB Type A Female Connector Adapter 5V Power Cable 5.5mm/2.1mm : Electronics
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Amazon.com: lkelyonewy 8Pack Female DC Threaded Barrel Jack Panel Adapter 5.5mm x 2.1mm Connector, 18AWG Wire DC Power Jack Panel Mount Socket 2 Pin Solder Type with Dustproof Plug,for MP3 Phone Audio
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