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LM2596: LM2596 DC 4.0-40 to 1.3-37V Adjustable Down Power Module + LED Voltmeter DC/DC Easy to use: Input voltage range: 4-40 V (40 V to limit the highest voltage). Output voltage range: 1.25 V - 37 V (decompression mode, input output should be greater than 2 V). Compact design: with the voltage display function, the displayed accuracy is ± 0.05 V, the range is between 0 and 40 V. (Note: To get a more accurate voltage display, please make sure the input voltage is higher than 4V). 【High Performance】 Button for switching the input or output voltage measurement and LED indicates the current measurement of input or output voltage; the Nixie tube can be switched off with another button. Entries in these states can be saved and will not be lost even if the power supply is interrupted.