DC-DC 3A Adjustable Voltage Regulator with LCD Display

This circuit is an adjustable DC-DC regulator with LCD display that can display voltage and current simultaneously. This module has two buttons and adjusts the voltage. The product is shipped with a protective plexiglass box. The box is disassembled.

Calibration method:

With the power off, press and hold the left button and turn on the source, press the left button when the screen starts flashing , measuring the multimeter output voltage, press the left and right button to adjust the multimeter measurement voltage to 5V, such as 5.V. , 4.98V or 5.02V is also ok, in this case, please ignore this item display. After adjustment, please turn it off and on again, then the calibration is completed. Errors can be calibrated at 0.04V, if the error is larger, you can try to calibrate again.