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USB to 2.1mm DC Booster Cable - 9V : ID 2777 : $6.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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USB Type C 3.1 PD to 5.5mm Barrel Jack Cable - 9V 5A Output [1.2m long with E-Mark] : ID 5449 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: CCYC DC 5V to DC 9V USB Voltage Step Up Converter Cable, Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless
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