Amazon.com: Hilitand DC DC Converter, DC DC 48V to 12V 10A 120W Voltage Step Down Module Buck Power Converter : Electronics
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12 volt to 12 volt DC/DC regulators or converters fully isolated, waterproof IP66, marine, industrial and military grade voltage regulators (fully regulated) 60 Watts.
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Amazon.com: DROK Boost Buck Converter 9V-36V to 12V 3A 36W Aluminium Shell Waterproof Auto Step Up Down Voltage Regulator 12V Volt Transformer for Car Audio Solar Power System LCD Television LED Display
USB Step Up Converter DC 5V to 12V
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