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LM3671 3.3V Buck Converter Breakout - 3.3V Output 600mA Max : ID 2745 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Ultra-Low Quiescent Current, Inductor Built-in 150mA Step-down DC/DC Converters ”micro DC/DC” XCL232 Series - Electronics-Lab.com
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Amazon.com: (5 Pack) JacobsParts DC Boost Module 3V 3.3V 3.7V 4.2V Input 5V 2A USB Output 10W DIY Power Bank : Electronics
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