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DC-DC 5V 12V 24V Buck Boost Power Supply Module 35W 4A CVCC Adjustable Automatic Step UP DOWN Voltage Converter LCD Display - AliExpress
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UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output : ID 1385 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Mini DC/DC Step-Down (Buck) Converter - 5V @ 1A output [TSR12450] : ID 1065 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Tebru DC-DC Positive & Negative Voltage Boost-Buck Converter Output ±5V 6V 9V 10V 12V 15V 18V 24V, Boost Buck Regulator, Positive Negative Voltage Converter - Walmart.com
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