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Amazon.com: DC to DC Boost Converter 12V/3.5A DC-DC Step-up Boost Voltage Converter Module 3V 3.3V 3.7V 5V to 12V Adjustable Voltage Regulator : Electronics
Pololu - 12V, 2.5A Step-Up/Step-Down Voltage Regulator S13V25F12
12V/24V to 56V 10A 560W DC DC Step Up Converter Voltage Regulator Char – Daygreen
DC-DC 12V 24V to DC 200V-450V 220V 380V High Voltage Boost Converter Step Up | eBay
Step-Up DC-DC 12~97V 30A 1500W
Amazon.com: DC DC 12V to 15V 15A Step-up Module,Boost Converter 9V-13V to 15V Voltage Regulator,Waterproof Power Adapt 225W 15V Volt Transformer Module(12V to 15V 15A) : Electronics
1pc DC-DC Converter 12V to 100V-250V Voltage Boost Step-up Power Supply Module | eBay
7W Mini DC DC Boost Step Up Converter 2.6-5.5V to 5V 6V 9V 12V Voltage Regulator Module - Invastor