DC-DC 4-40V To 1.27-37V Converter With Display

A precision step-down DC-DC converter with an integrated voltmeter display — giving you real-time visibility of both input and output voltage at the press of a button. Adjustable from 1.27 V to 37 V with up to 2 A output, this module is ideal for bench power supply builds, embedded projects, and any application where you need a stable, tunable voltage rail with instant feedback.

🔹 Key Applications

• Bench power supply builds requiring voltage monitoring
• Powering Arduino, ESP32, or Raspberry Pi from higher-voltage sources
• Embedded systems requiring a stable adjustable voltage rail
• Solar charge controller output regulation
• Battery-powered projects needing a regulated 3.3 V or 5 V output
• Lab and education electronics experiments

🔹 Why Choose This Module?

• Integrated voltmeter display — no multimeter needed during setup
• Toggle between input and output voltage reading with one button
• Wide input range (4–40 V) — powers from LiPo packs, 12 V batteries, or bench supplies
• Fine-grained output control — dial in your exact required voltage
• Compact 65 × 35 mm PCB — fits inside enclosures and control panels

🔹 Technical Specifications

• Input Voltage: 4 V – 40 V DC
• Output Voltage: 1.27 V – 37 V DC (continuously adjustable)
• Output Current: 2 A
• Display: LED digital voltmeter (±0.1 V resolution)
• Display Range: 0 V – 45 V
• Dimensions: 65 × 35 mm

🔹 What's Included

1 × DC-DC Step-Down Converter Module with Display

🔹 Pro Tip

💡 Use the S1 button to switch the display between input and output voltage — green LED indicates output, red indicates input. Calibrate the voltmeter against a known reference for lab-grade accuracy. Great for building a compact variable bench supply.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.