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A handy way to power 12V powered devices with a center-positive 2.1mm DC barrel jack from a USB port. Adafruit 2778
USB to 2.1mm DC Booster Cable - 12V
Adafruit in Canada Tagged USB Cables - Elmwood Electronics
We have a lot of power adapter packs in the shop - from 9V to 12V to 5V we even have an adjustable power supply like one of these. But all of them
30 Piece 5.5 / 2.1mm to DC Barrel Jack Adapter Kit
Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On - Corzotech
Power Shield Li-Ion/Li-Pol for Adafruit Pro Botland - Robotic Shop
Solar USB/DC charger for Li-Ion and Li-Pol batteries - Adafruit 390
Power The Pi Hut
USB912: DC To DC Converter 9V Or 12V Selectable Power Supply Module
Adafruit PowerBoost 500 Shield - Corzotech