30V~10A Auto Step-Up/Step-Down DC-DC Converter Module – HandsOn Tech
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DEVMO 8-32V to 45-390V DC-DC High Voltage Boost Converter ZVS Step-up Booster Module
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UCTRONICS DC 6V 9V 12V 24V to DC 5V 5A Buck Converter Module, 9-36V Step Down to USB 5V Transformer Dual Output Voltage Regulator Board [2 Pack]
250w Dc-dc Boost Converter Adjustable 10a Step Up Constant Current Power Supply Module Led Driver For Arduino - Voltage Regulators/stabilizers - AliExpress
Amazon.com: DC-DC Buck Converter Step Down Module, DC 6.5V-60V to 1.25-30V Maximum 10A Adjustable Power Supply Voltage Regulator Module, Voltage Step Down Converter Board : Electronics