DC/DC step-down converter module 1.25-37V/1A, LED Voltmeter | GM electronic COM
300W 20A DC DC Adjustable Step Down Buck Converter Module Constant Current Voltage Regulator Power Supply Transformer LED Driver|Transformers| - AliExpress
Mini Dc-dc 12-24v To 5v 3a Step Down Power Supply Module Voltage Buck Converter Adjustable 97.5% 1.8v 2.5v 3.3v 5v 9v 12v - Integrated Circuits - AliExpress
DC-DC Buck Step Down Adjustable Converter 4.5-60V to 3.3V 5V 6V 9V 12V 24V 3A | eBay
Step-Up/Step-Down Converter Features Ultra-Low Quiescent Current
Amazon.com: DC-DC Buck Converter Step Down Module, 30A 800W High Power Constant Voltage Module 12V24V36V48V Adjustable Buck Converter Step Down Voltage Regulator Module : Electronics
Example of Derivation for a Step-Up/Step-Down Converter - 2
1 x DC-DC Digital Display Step Up Step Down Boost Board Buck Converter Power Module: Amazon.com: Industrial & Scientific
Pololu 5V Step-Up/Step-Down Voltage Regulator S7V7F5