TECNOIOT 5pcs DC-DC SX1308 Step-UP Adjustable Step Up Boost Converter 2-24V to 2-28V 2A

5pcs DC-DC SX1308 Step-UP Adjustable Power Module Step Up Boost Converter 2-24V to 2-28V 2A DESCRIPTION: Maximum input voltage: DC 2-24V Maximum output voltage: DC 2-28V Switching frequency: 1.2MHz Maximum current output: 2A Oscillation frequency 1.2MHz Efficiency is as high as 95% Circuit has short circuit protection, overheating protection function 10k to adjust potentiometer, adjust the output voltage NOTE IMPORTANT: The first time when you use it, you need to keep turning the potentiometer (almost give it about 30-40 turns). The potentiometer is a ten-turn trim potentiometer, its the prominent blue box with a bress screw. Its used to set the outputvoltage of the product. Since it's a boost converter setting it to a lower Output-voltage then Input-voltage kills the chip. In the state it is in when shipped the chip dies at 5V, if you want to use this thing, you have to turn it to the maximum settings (counterclockwise/mathematicly positive). PACKET CONTAINS: 5pcs x DC-DC SX1308 Module