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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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Amazon.com: Lysignal LM2596 DC-DC Step Down Power Supply Module 3A Adjustable Step Down Module Buck Converter 24V to 12V 5V 3V : Electronics
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