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Low Noise LT1614 DC/DC Converter Delivers –5V at 200mA from 5V Input | Analog Devices
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UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output : ID 1385 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 12v to 5v Volt Converter, DROK DC 8-35V to 5V 3A 15W Voltage Regulator Board Power Supply Module, 9V 12V 24V Waterproof Car Volt Step Down Buck Converter : Electronics
Dd4012sa_5v*10 10pcs 5w 7-40v To 5v Dc Dc Buck Converter Module Step-down Voltage Regulator Board - Inverters & Converters - AliExpress
DEBO DCDC BOOST: Developer boards - voltage regulator 0.9...5V, DC - DC converter, at reichelt elektronik
Amazon.com: 25W DC-DC 12V 24V to 5V 5A Converter Buck Regulator 5 Volts Waterproof Vehicle Power Supply : Electronics