LM2596 DC-DC adjustable step-down module with voltmeter display and voltage accuracy calibrationModule highlights:1. Comfortable price, intelligent and humanized design, with high cost performance!2. On board voltmeter, the voltmeter can be self calibrated, and there will never be a problem that the voltmeter does not work!Module performance and characteristics: With voltmeter display and self calibration. More advanced voltage microprocessor is adopted, with voltmeter error of 0.05V and range of 0~40V. (To ensure the accuracy of the voltmeter, please ensure that the input voltage is above 4.5V) Touch the key to switch the input or output voltage measurement, and an indicator lamp will display which voltage is being measured, and save the settings, even if the power is cut off and the machine is started again. The voltmeter can be closed, and it can be easily realized by touching the left button when it is not needed. With terminal blocks, it can be used easily without soldering iron, and welding wire connection points are reserved. Input voltage 4.0~40V. (The input voltage must be more than 1.5v higher than the output voltage) Adjustable output voltage range: 1.25V~37V, continuously adjustable. (The input voltage must be 1.5V higher than the output voltage) The output current is 3A, which is recommended to be used within 2.0A. Heat dissipation shall be strengthened for large current. The output power is 20W. If it exceeds 15W, please strengthen heat dissipation. High conversion efficiency, averaging 88% (efficiency is related to input and output voltage, current and differential voltage) With reverse connection protection, reverse connection does not burn With overheating protection and short circuit protection functions Size 6.1 * 3.4 * 12cm (L * W * H) Weight: 22gScope of application:This module can be used in the field of voltage reduction where the input voltage is higher than the output voltage, such as storage battery, power transformer, DIY adjustable regulated power supply, 24V vehicle mounted pen and notebook power supply, industrial equipment voltage reduction, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 36V to 24V, etc.