10 Pack LM2596S DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Module Specifications: - Output Current: 3A Max - Input voltage: DC 3V - 40V - Output Voltage: DC 1.5V - 35V - Switch Frequency : 65KHz - Load Regulation: ± 0.5% - Voltage Regulation: ± 2.5% Tips: 1.Don't deserialize input and output interfaces. 2.Can not be used to boost voltage. 3.Please keep output under 2.5A 4.Please use a heat sink if it takes a long-time working. Operation: Connect to power source, adjust the screw button on the blue potentiometer and monitor voltage with multimeter to get the needed voltage(The voltage is very high by the factory default, please takes about 7-15 turns CCW before the voltage starts Ramping down) Package: 10x LM2596S Buck Converter Module