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8pcs DC 5.5X 2.1 MM female jack plug adapter Connectors to 6.3 6.0 5.5 4.8 4.0 3.5mm 2.5 2.1 1.7 1.35mm Male Tips power adaptor|Connectors| - AliExpress
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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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2.1mm to 1.7mm DC jack adapter : ID 411 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter : ID 2727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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