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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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3.5mm / 1.1mm to 5.5mm / 2.1mm DC Jack Adapter : ID 4287 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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MEE audio 3.5mm to 2.5mm stereo audio adapter for select Sennheiser, JBL, Klipsch, and Bose headphones
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Amazon.com: CableCreation 1/4 to 3.5mm Adapter Cable, TRS 6.35mm Male to 3.5 mm Female Stereo Jack Audio Adapter for Amplifiers, Guitar, Keyboard Piano, Laptop, Home Theater, Phone, 1FT : Electronics
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Amazon.com: ANDTOBO 1/4'' to 3.5mm Stereo Pure Copper Headphone Adapter,3.5 mm(1/8'') Plug Male to 6.35mm (1/4'') Jack Female Stereo Adapter for Headphone, Amp Adapte, Black 2-Pack : Electronics
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