The buck converter Input Voltage Range DC 3V to 40V (The input voltage must be more than 1.5 v higher than the output voltage. It cannot be boosted); Output Voltage Range DC 1.5V to 35V continuously adjustable voltage, high efficiency output current is 3A.; All solid capacitors using SANYO36u thick circuit boardsHigh-Q inductors with high power output LED indicator; The dc to dc converter output with high power conversion efficiency up to 92%. Measured 12V input, 5V output current, 1A load regulation rate is less than 1%.; 20 Pack LM2596 DC to DC High Efficiency Voltage Regulator 3.2 -35V to 1.25 -30V Buck Converter DIY Power Supply Step-Down Module for DIY