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SparkFun Education - Concepts Library - What is an Arduino
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Arduino power supply video tutorial #1. barrel jack.
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![[5x] Male DC Barrel Jack Adapter for Arduino - 2.1 mm inner 5.5 mm](https://i2.wp.com/i.ebayimg.com/00/s/MTA2N1gxMDY3/z/fl4AAOSwVFlT2-Av/$_62.JPG?set_id=880000500F)
