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CJMCU- Mini USB 5V/3.3V DC Power Supply Socket Board AMS1117-3.3V, MINI USB Input: DC 5V Type: CJMCU MINI USB AMS1117
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Xucus Micro USB to 5V to 3.3V AMS1117 3.3V Regulated Power Supply Module USB to 3.3V Module: Amazon.com: Industrial & Scientific
![AMS1117 3.3V regulator outputs 4.2V or 3.3V depent on source of 5V input - Electrical Engineering Stack Exchange AMS1117 3.3V regulator outputs 4.2V or 3.3V depent on source of 5V input - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/uloNA.png)