1/5/10pcs LM317 Adjustable Voltage Regulator Power Supply DC-DC Converter Buck Step Down Circuit Board Module Linear Regulator Module description: name: adjustable linear regulator output Current: 1.5A (minimum value),2.2A (typical value) input and output voltage difference (VI-VO):40Vdc (maximum value) output adjustable voltage range: 1.2~37V operating temperature:-55C to +150C current output: 1.5A voltage input: 4.2~40V operating temperature: 0C ~ 125C eigen frequency :100(MHz) module size: 35.6(mm)x16.8(mm) input Mode: VIN input positive, GND input negative output mode: VOUT output positive, GND output negative maximum output current: maximum output current = 3/(input voltage-output voltage) buyers need to know that the efficiency is not very high because it is linear. In order to improve the efficiency, it is better to have a differential pressure of 3V in input and output. But the Max volts difference between input and output should not exceed 30V, that is: input-output 30v, otherwise it is easy to burn out the module. Because it is a linear Buck DC-DC circuit, the input voltage needs a differential pressure of more than 3V higher than the output voltage to ensure the stability of the output voltage. Input voltage: 40V-4.5V (the highest limit measured in our shop can reach 40V), adjustment mode: first correctly connect the input power supply (between 40-4.5) and then use multimeter to monitor the output voltage and adjust the potentiometer (generally turn forward to boost, reverse to Buck) Note: the output power of this module is not only affected by the load capacity of the module itself, but also affected by various factors such as the front power supply and the back load; The following data is the result measured by professional equipment, do not consider the influence of other factors. The power module is a kind of electronic components, please consider buying it without the information of electronic professionals.