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![DIY Arduino] Power circuit design - please help - Hardware - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/f/f/c/ffcee75a62da35073a1a4840b9c4e4dbecf015d8.jpeg "DIY Arduino] Power circuit design - please help - Hardware - Arduino Forum")
DIY Arduino] Power circuit design - please help - Hardware - Arduino Forum
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RPM Gauge Arduino.... Need the explanation of the Zener diode, what is the fuction on this circuit - Electrical Engineering Stack Exchange
Protecting your IO (Input Output) using Zener Diode | 14core.com
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