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5PCS Mini DC-DC Boost Step Up Converter 3V 3.2V 3.3V 3.7V 5V 9V to 12V Voltage Regulator PCB Board Module can set 5V/ 8V/ 9V International Power Cords - Newegg.com
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operational amplifier - Step up 3.3V to 5V to use as power of op-amp - Electrical Engineering Stack Exchange
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Amazon.com: Comidox 1.5V 1.8V 2.5V 3V 3.3V 3.7V 4.2V to 5V DC-DC Step Up Power Module Voltage Boost Converter Board 0.9-5V to 5V 5PCS : Electronics
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