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How to interface a 3.3V output to a 5V input. – next-hack.com
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5V to 3.3V logic level translation/conversion/shifting: how to interface a 5V output to a 3.3V input. – next-hack.com
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5V to 3.3V logic level translation/conversion/shifting: how to interface a 5V output to a 3.3V input. – next-hack.com
Pololu 3.3V Step-Up Voltage Regulator U1V11F3
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Addicore Logic Level Converter - Bi-Directional 5V to 3.3V, I2C signal capable
3.3v to 5v conversion with non-5v tolerant part. (single npn transistor?) - Electrical Engineering Stack Exchange
Uno - Using 5v and 3.3v pins at the same time? - General Electronics - Arduino Forum
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DC 5-40V to 3V 3.3V 4V 5V 6V 12V DC-DC Converter Step-Down Power Supply Module | eBay
Amazon.com: DC-DC DC 5-40V to 3V 3.3V 3.7V 5V 6V 7.5V 9V 12V 1A Buck Step Down Converter Module Voltage Regulator Board Without Pin 1Pcs (Color : D4012SA 6V) (Color : D4012sa
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SparkFun Breadboard Power Supply 5V/3.3V - PRT-00114 - SparkFun Electronics
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DC-DC Multi-output Buck Converter 3.3V/5V/9V/12V - DFRobot
5V to 3.3V logic level translation/conversion/shifting: how to interface a 5V output to a 3.3V input. – next-hack.com
