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LM317 DC-DC Buck Converter 5V 6V 9V 12V 24V Voltage Step Down Module Linear Regulator
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Pololu 5V, 5A Step-Down Voltage Regulator D24V50F5
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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]