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DC-DC 6~14V to 5V/8A High Power Buck Converter - DFRobot
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0.9V-5V input, 5V USB Output Boost Regulator Module [CE8301] - US $0.70 : HAOYU Electronics : Make Engineers Job Easier
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Low Noise LT1614 DC/DC Converter Delivers –5V at 200mA from 5V Input | Analog Devices