Wiring according to the instruction diagram, do not connect wrong.
This is a step-down module, the input voltage should be higher than the output voltage, can not be boosted!
Conversion efficiency is related to the voltage difference between input and output voltage and current.
Output current is more than 2.5A or output power more than 10W, and long time working, please strengthen the heat dissipation.
The module current is determined by the connected load and the output voltage itself.

Note:
Before using the module for the first time, it is important to leave the module unattended.
Before the first use, the module is not powered and not connected to the load,
the blue potentiometer copper head of a word mouth adjustment cap (aligned with my chest) counterclockwise rotation of the potentiometer to the end (more than 30 turns) hear the ‘tah’ sound,
the last on the power, and take a multimeter to monitor the module output voltage,
rotate the potentiometer to achieve the ideal voltage clockwise!

Package include:
6 x lm2596 DC-DC step-down module

• DC-DC step-down power supply module input: DC3.2v-35v (input voltage must be 1.5 V higher than the output voltage, no boost)
• DC-DC step-down power supply module output: DC1.25v-30v voltage is continuously adjustable, maximum output current is 3 A
• LM2596 is a buck module, the input voltage must be higher than the output voltage and cannot boost.
• Note: Before using it for the first time, when the module is de-energized and not connected to a load, turn the copper-headed adjustment cap of the blue potentiometer (aim it at your chest) counterclockwise to the end (more than 30 turns). Hear There is a "click" sound, and finally power on, use a multimeter to monitor the module output voltage, and turn the potentiometer clockwise to reach the ideal voltage

Power/Wattage: 6 pcs