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Mini DC/DC Step-Down (Buck) Converter - 3.3V @ 1A output [TSR12433] : ID 1066 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: DC-DC 5-40V to 3.3V 5V 12V ADJ Adjustable Step Down Voltage Regulator, LM2596 4-Way Multiple Output Switching Power Supply Module Board, 5A Buck Volt Converter Transformer Stabilizer : Electronics
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