DIY Arduino Power Supply Shield with 3.3v, 5v and 12v Output Options
power supply - How does the 3.3V output work in this PSU circuit? - Electrical Engineering Stack Exchange
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What is the best way to supply a circuit with 3.3v and 5v simultaneously? I've found a couple of power modules that will take mains 240v and convert it to 5v but
Basic 3.3v power supply / regulator 🥖 John Mueller's randoms
SparkFun Breadboard Power Supply 5V/3.3V - PRT-00114 - SparkFun Electronics