Positive Negative Dc Barrel Jack Wiring
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![power supply - DC Barrel + Battery schematic - Electrical Engineering](https://i2.wp.com/i.stack.imgur.com/WDaeE.png)
![Thinline 2.1mm DC Jack Wiring?](https://i2.wp.com/dqzrr9k4bjpzk.cloudfront.net/images/1069044/62760919.jpg)
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