DC-DC Adjustable Step-Down Voltage Regulator Module. With Volt Meter.
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LM2577 DC DC Boost Step Up Module Converter Digital Voltmeter Display Voltage Meter 3A Output 3 34V to 4 35V|step up|dc-dc step updc-dc boost converter - AliExpress
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DC DC Buck Converter CC CV Power Module 0.6 30V 5A Adjustable Regulated power supply Voltmeter ammeter CNC Color screen 80W|Multimeters| - AliExpress