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What's the point of these power supply modules? I thought an Ardunio could take a 9V power supply, why not just VIN 9V directly from DC wall adapter? : r/arduino
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LAOMAO DC-DC 12V to 3.3V 5V 12V Multi-Output Breadboard Power Supply Adapter Power Supply Module Compatible with Arduino (Pack of 3) : Amazon.de: Electronics & Photo
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