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LM2596 4V-40V In 1.25V-37V Out LED Display 3A Buck Voltage Regulator

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LM2596 4V-40V In 1.25V-37V Out LED Display 3A Buck Voltage RegulatorPower this LM2596 step-down DC-DC power converter module with any voltage from 4V to 40V. The output is adjustable via the on-board potentiometer from 1.25V to 35V at up to 3A maximum current. Monitor the input and output voltage with the internal LED display. 

This module is ideal for regulating 12V, 18V or 24V battery voltage down to the 12V, 9V, 5V or 3.3V levels required by many electronic circuits. For example, it could step a 12V car battery down to 5V for USB-powered devices such as cell phones or Arduino microcontrollers.


  • Analog Control: Use a mini screwdriver to increase or decrease output voltage by adjusting the potentiometer screw, clockwise to increase voltage, and counterclockwise to decrease voltage.
  • Has very stable output, the input range is DC 4~40V, and the output range is DC 1.25V to37V, The input voltage should be higher than the output voltage at least 1V.
  • Press the button next to the voltmeter to display input voltage or output voltage. LED D3 lights on when the output voltage is displayed, tap the button, and LED D4 lights on when the input voltage is displayed. Press and hold the button to turn off the display.
  • Screw-type wiring terminals require no soldering, input and output wires can be attached with a screwdriver. Solder pads to the sides of the connectors are also provided for permanent solder attachment.    


  • Input Voltage: DC 4V – 40V (the input voltage should be higher than the output voltage by at least 1V)
  • Output Voltage: DC 1.25V – 37V (continuously adjustable using onboard multi-turn potentiometer)
  • Output Current: 2A continuous, 3A maximum (LM2596 device may require heatsinking above 2A)
  • LCD Voltmeter: 0~40V
  • Voltmeter Accuracy: .+/-0.1V
  • Internal Oscillation Frequency: 150KHz
  • Output ripple: 30mA maximum

Operating Instructions

  • Connect the input DC power supply to the input terminals, ensuring that the polarity is correct, and the voltage is between 4V DC and 40V DC. Turn on the input DC voltage.
  • The onboard voltmeter will illuminate. The pushbutton to the right of the meter switches between displaying the input voltage and the output voltage. The LEDs directly above the pushbutton indicate whether the display is showing the Input Voltage or the Output Voltage. The IN LED illuminates when the Input Voltage is selected; the OUT LED illuminates when the Output Voltage is selected. Press and hold the button to turn off the display.
  • With no load connected to the output connectors, set the meter to display the output voltage, then set the output to your desired level using the multi-turn potentiometer. NOTE: To reduce the output voltage you may need to turn the potentiometer counter-clockwise several revolutions (up to 10 full revolutions) before the voltage will begin to decrease.
  • Once the desired output voltage is set, turn off the input DC power, connect the load to the output connectors, and then turn on the input voltage.
  • If the output voltage is substantially less than the level you originally set with no load, either your input DC power supply cannot supply the power being drawn by your load, or your load is drawing more than 2 Amps current. In either case, turn off the input power and resolve the issue, otherwise, you may damage your DC power supply or the converter.

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