LM2596 Step-down LM2596S Voltage Converter Power Supply DC 4.0~40 to 1.3-37V.
Product description\nHow to use:\n1, Press the button in a short time (2 second) so that \""IN\"" LED lighted, the voltmeter shows the\nvalue of input voltage.\n2, Press the button in a short time (2 second) again so that \""OUT\"" LED lighted, the voltmeter shows\nthe value of output voltage.\n3, Rotate the top screw of potentiometer clockwise to boost the value of the output voltage,\nanti-clockwise to reduce it.\n4, Long press the button between 1 and 4 seconds to turn off the voltmeter.\n\nHow to adjust accuracy of input/output voltage:\n(for the person who need a highly accurate value of number)\n1, Long press the Right button 2 seconds after the release, voltmeter and \""IN\"" LED flash in\nsynchronization entering into the input voltage calibration mode.\n2, Long press the Right button 2 seconds after the release, voltmeter and \""OUT\"" LED flash in\nsynchronization entering into the output voltage calibration mode.\n3, Press the button in a short time (1 second) to adjust the value r
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