AC-DC Buck Converter Step Down Transformer Power Supply Module 5V 700mA 3.5W AC 220v to 5v DC Converter Module for Arduino - AliExpress Electronic Components & Supplies
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LM2596HV AC/DC to DC Buck Step Down Converter Power Supply Module 3v 3.3V 5V 6V 9V 12V 15V 24V AC 5V 30V, DC 5V 50V|Integrated Circuits| - AliExpress