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In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...
The 5.2V is safe for all 5V-powered electronics like Arduino, Raspberry Pi ... converter chip can handle a wide range of voltages (3-12V) and has some really nice extras such as power good ...
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