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Features:- DC to DC step down module- Thickened circuit boards- Advanced solid-state capacitor- Short circuit and over-temperature protection- 100% tested, sealed in anti-static packagingSpecification:Output Current:3A(max)Output: DC 1.5V to 35V voltage continuously adjustable.Input: DC 3V to 40V(input voltage must be 1.5 V higher than the output voltage, no boost)The positive input IN +, negative input IN-!The positive output OUT +, negative output OUT-!Input and output can not be reversed, Pick up may burn off.Welding Method:Solder, directly solder the power cord to the input (output) port. Or Welding pin,insert the pin through the lead or insert it into the hole plate.Attention:1.The factory initial blue potentiometer, the resistance value needs to be connected to the input at the limit, and then rotates counterclockwise. After about 7-8 turns, the output voltage will change.2.Long-term work is recommended for currents up to 2.5A, plus heat sink (10W or more output)3.Because it is a step-down module, in order to ensure stable output, please keep a small 1.5V differential