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Twenty small green circuit boards with blue LED displays and silver adjustment screws

KEHIPI

KEHIPI 20pcs LM2596 Buck Converter 4-40V to 1.25-37V power adapter

SKU CH-4JDH-FR9WR

Pack of 20 adjustable buck converters stepping 4–40 V down to 1.25–37 V with LED voltmeter and 3 A peak output

  • 20 converters in one pack for multi-project use
  • Adjustable 1.25-37V output from 4-40V input range
  • Built-in voltmeter with ±0.1V accuracy shows IN or OUT
  • Reverse, overheat and short-circuit protection for safe operation
  • Calibration mode stores ±0.5V settings permanently after power loss

20-Piece Buck Converter Kit

This pack contains twenty LM2596 step-down modules that accept a 4-40V DC input and produce an adjustable 1.25-37V output. Each board integrates a three-digit LED voltmeter and a multi-turn potentiometer for voltage trimming. The bundle suits hobbyists, repair technicians and small-scale builders who need multiple identical regulators for test benches, battery chargers or LED drivers.

Input Headroom and Current Limits

The regulator requires the supply to sit at least 1.5V above the desired output to maintain regulation. Continuous current is rated at 2A with a 3A peak allowance; loads above 2A or 15W demand an external heatsink. The internal oscillator runs at 150kHz, and the on-board meter only activates once the input exceeds 4V, so very low-voltage sources cannot be monitored.

Protection Features and Daily Use

Built-in safeguards cover reverse polarity, overheating and short-circuit events, reducing the chance of damage during wiring mistakes. Calibration mode lets you trim the displayed input and output readings independently to ±0.5V accuracy, and the setting survives power cycles. The display can be switched off with a long press to save power, and a short press restores it instantly.

Highlights

  • 20 converters in one pack for multi-project use
  • Adjustable 1.25-37V output from 4-40V input range
  • Built-in voltmeter with ±0.1V accuracy shows IN or OUT
  • Reverse, overheat and short-circuit protection for safe operation
  • Calibration mode stores ±0.5V settings permanently after power loss

Specifications

BrandDROK

Questions about this item

How many buck converters come in the 20pcs pack and what input range do they accept?

The pack contains 20 LM2596 buck converters, each accepting an input voltage of 4-40V.

What continuous output current can I expect from each converter in a real build?

Each module delivers a rated 2A continuous output current, with a 3A maximum; for loads above 2A adequate heatsinking is advised.

What is the 150kHz switching frequency and how does it limit performance?

The 150kHz second-generation regulator enables high conversion efficiency and minimal power loss, capping the switching speed at 150kHz for stable step-down operation.

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