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【DC-DC SX1308】 DC-DC SX1308 Step-UP Adjustable Power Module Step Up Boost Converter 2-24V to 2-28V 2A 【Design compact】 Maximum input voltage: DC 2-24V; Maximum output voltage: DC 2-28V; Switching frequency: 1.2MHz; Maximum current output: 2A 【High performance】 Oscillation frequency 1.2MHz; Efficiency is as high as 95%; Circuit has short circuit protection, overheating protection function; 【NOTE IMPORTANT!】 The first time when you use it, you need to keep turning the potentiometer (almost give it about 30-40 turns).