Voltage regulators are the way to avoid interference and saves voltage stress on components.
Hobby King - Matek Micro BEC 5V/12V-ADJ
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Banggood - Matek 4S Lipo to 12V Linear Voltage Regulator Regulator
Matek 4S Lipo to 12V Linear Voltage Regulator Regulate Module For FPV Camera Multicopter
ebay - MP1584 Adjustable 3A DC-DC Converter Step Down Voltage Regulator
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