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Lm2587 Dc-dc 3.5v-30v To 4v-40v Step Up Power Supply Module Adjustable 5a Boost Converter Voltage Regulator Board For Arduino - Integrated Circuits - AliExpress
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Amazon.com: 2PCS DC-DC Boost Converter, DC-DC 3.3V-13V to +15V/-15V Positive Negative Dual Step-Up Converter Board : Electronics
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