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DC/DC Step-down converter LM2596 3A with V-meter

LM2596 step-down regulator with LED voltmeter, 3A - switchable input/output voltage display

Specifications

Based on	LM2596
Max. current	3 A
Input voltage	4 - 35 V DC
Output voltage	1.2 - 30 V DC
Protection	Input reverse polarity, thermal, current-limit
Display	LED voltmeter, switchable input/output
Voltmeter resolution	0.1 V
Voltage adjustment	Multi-turn trimmer
Size	61x34x12 mm

Press the right button so the "OUT" LED lights up and the voltmeter shows the output voltage. Press and hold the right button for more than 2 seconds, then release — the voltmeter and "OUT" LED will flash synchronously, indicating you've entered output voltage calibration mode.
Press the right button to increase the value, or the left button to decrease it. Since the step is less than 0.1V, the smallest displayed change is 0.1V, so you may need to press the button 1–5 times to see the reading change by 0.1V.
Press and hold the right button for more than 2 seconds, then release, to exit calibration mode. All settings are saved automatically.

Press the right button so the "IN" LED lights up and the voltmeter shows the input voltage. Press and hold the right button for more than 2 seconds, then release — the voltmeter and "IN" LED will flash synchronously, indicating you've entered input voltage calibration mode.
Same as step 2 of the output voltage calibration.
Same as step 3 of the output voltage calibration.