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power supply - Step up converter (3.7V to 5V) that will also charge battery! - Electrical Engineering Stack Exchange
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Mini DC-DC Boost Step Up Converter 3V 3.2V 3.3V 3.7V 5V 9V à 12V Régulateurs de Voltages PCB Module Can Set 5 V / 8V / 9V : Amazon.fr: Commerce, Industrie et Science
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DC-DC DC 2.6-6V à 3.7V 5V 12V l'autorisation Boost Step Up Converter Tech Voltage Sochi Board sans broche - AliExpress
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DC-DC DC 5-40V à 3V 3.3V 3.7V 5V 6V 7.5V 9V 12V l'autorisation Buck Step Down Converter Tech Voltage Sochi Board
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