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Switching Split Power Supply ± 12V 500mA Split Supply : ID 2591 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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500PCS High quality 12V 500mA AC 100V-240V Converter Switching power adapter DC 0.5A Supply AU Plug DC 5.5mm x 2.1mm - AliExpress
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50PCS 12V 500mA AC/DC 12V 0.5A Switching Power Supply adapter Reverse Polarity Negative Inside EU plug 5.5mm x 2.1-2.5mm - AliExpress
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Amazon.com : Security-01 2-Pack AC to DC 12V 0.5A 500mA Power Supply Adapter 5.5mm x 2.1mm UL Listed FCC,CS-1200500 : Electronics
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12V 0.5A Power Supply 6W 12V 500mA Power Adapter 100V-240V 50-60Hz AC to 12 Volt 0.5A DC Power Supply Converter - Walmart.com
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