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LM2596 Adjustable DC-DC Step-Down Voltage Regulator 4-40V to 1.25-37V with LED Voltmeter Display 2A

$7.48 USD

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LM2596 Adjustable DC-DC Step-Down Voltage Regulator with LED Voltmeter Display

A versatile LM2596-based buck converter module with an integrated LED voltmeter display, allowing real-time monitoring of input or output voltage without an external multimeter. Output voltage is continuously adjustable from 1.25V to 37V via onboard −/+ buttons, making it ideal as a variable bench power supply, Arduino project power module, or embedded voltage regulator.

Specifications

Input Voltage: DC 4V – 40V
Output Voltage: 1.25V – 37V (continuously adjustable; input must be ≥1V above output)
Output Current: 2A continuous, 3A peak
Switching Frequency: ~150kHz
Output Ripple: ~100mV peak
Voltmeter Range: 4V – 40V (±0.1V accuracy)
Display: Red LED 3-digit voltmeter
PCB Size: 66 × 35mm
Operating Temperature: −40°C to +85°C

Voltmeter Display Operation

Two buttons on the left side of the voltmeter switch between input voltage display (red LED indicator) and output voltage display (green LED indicator)
− button: Decreases output voltage
+ button: Increases output voltage
Remove the P3 jumper cap to disable the voltmeter display and reduce quiescent current

Wiring

IN+ → Positive supply input (4–40V DC)
IN− → Negative supply input (GND)
OUT+ → Regulated positive output
OUT− → Regulated negative output (GND)

Important Notes

Input voltage must be at least 1V higher than the desired output voltage (buck/step-down only — cannot boost)
For voltmeter accuracy, ensure input voltage is above 4V
Add a heatsink to the LM2596 IC when operating near 3A or with large voltage differentials
Output ripple of ~100mV may affect sensitive analog circuits — add output capacitance if needed