---
product_id: 137529430
title: "DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade"
brand: "longwei"
price: "255.70 DT"
currency: TND
in_stock: false
reviews_count: 12
url: https://www.desertcart.tn/products/137529430-dc-power-supply-variable-0-30v-0-5a-4-digital
store_origin: TN
region: Tunisia
---

# 110V/220V Input 4-Digit LED Display 0-30V, 0-5A DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade

**Brand:** longwei
**Price:** 255.70 DT
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Power Up Your Projects with Precision!

## Quick Answers

- **What is this?** DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade by longwei
- **How much does it cost?** 255.70 DT with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/137529430-dc-power-supply-variable-0-30v-0-5a-4-digital)

## Best For

- longwei enthusiasts

## Why This Product

- Trusted longwei brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Equipped with multiple protection features for peace of mind.
- • **Smart USB Charging:** Charge your devices effortlessly with a 5V/2A USB interface.
- • **Versatile Applications:** Perfect for labs, schools, and DIY projects, all in a compact design.
- • **Whisper-Quiet Operation:** Intelligent fan technology ensures efficient heat dissipation with minimal noise.
- • **Precision at Your Fingertips:** Experience voltage and current adjustments with 0.01V and 0.001A accuracy.

## Overview

The LONGWEI DC Power Supply is a versatile and high-precision device designed for professionals and DIY enthusiasts alike. With a clear 4-digit LED display, adjustable voltage and current settings, and a smart USB interface, it meets a variety of power supply needs while ensuring safety and efficiency.

## Description

This serial single output switch power supply is a kind of DC regulated power supply with high efficiency and stability. It can be acted both as constant voltage as well as constant current dc power supply. For this serial power supply, it has perfect protection circuit, can be used in many areas. Applications: 1.Charge batteries, PCB board manufacturing industry 2.LED products, motors and dc fans test, 3.Electrofacing, electrolyzation, electronic components aging 4.Laboratory , Electronic equipment , Automatic Test Equipment  5.All other occasions need to use DC Power Supply Features: 1.USB interface 5V/2A, Power display window show. 2.Single phase, single output dc power supply 3.Constant voltage and constant current operation (C.C and C.V. automatic conversion) 4.Both current and voltage can be adjusted from 0 to rated value 5.4LED digital display 6.Intelligent temperature control fan to help power supply cooling fast Specifications: 1. Rated working conditions and dimensions: Output voltage: 0-30V Output current: 0-5A Voltage Display Accuracy：±0.5%; Current Display Accuracy：±0.5%; Input voltage: 220V±10%@50Hz, or 110V±10%@60Hz, manual switching Working environment: Temperature: -10 ° C ~ 40 ° C Relative humidity: <80% Storage conditions: Temperature: -20 ° C ~ 80 ° C Relative humidity: <702, power supply effect: CV≤0.1%+10mV CC≤0.1%+10mA 3. Load effect: CV≤0.1%+5mV    CC≤0.1%+10mV 4, ripple and noise: CV≤10mV r.m.s. CC≤20mA r.m.s. 5, display mode accuracy:4-digit LED digital display, display accuracy ±0.1% ± 1 word  What You Get:  Power supply host x 1  Output power cord x 1  Input power cord x 1  Test probes x2   Notice:   Do not operate in humid environment.Do not operate in flammable and explosive environment.  Keep the product surface clean and dry.

## Features

- ◆【High Precision, Wide Range】LONGWEI DC power supply is a professional power supply regulation device that designed with crystal clear, backlit 4-digit LED display of voltage, current, and power. Precise accuracy: 00.01V and 0.001A. You can easily tune it within 0-30V and 0-5A. Very durable and easy to observe even in low light conditions.
- ◆【5V/2A USB interface& Auto Power Calculation】What does the USB do? Please don't worry about run out of power now, you can charge your phone, repair phones and more through the 5V/2A USB interface. The hot selling point is that this power supply can calculate output voltage and current into power intelligently and displays the value on its large screen accurately. 110V / 220V input voltage can be switched and can be used worldwide.
- ◆【High Quality with Essential Safety】Safety is our priority. Grounding wire, The power supply takes the function of limited flow protection, overpower protection, over temperature protection, voltage overload protection. greatly improving its working efficiency and lifespan!
- ◆【Excellent Heat Dissipation】Equipped with a big fan controlled by intelligent temperature control sensor and multiple heat radiation grooves on both sides, Intelligent fan offers excellent heat dissipation effect, which reduces the noise and prolongs the life of product effectively.
- ◆【Various Application】This one weighs less than 3kgs and measures only 11.2 x 5 x 5.7 inches, Applies for laboratory, school, home, electronic repair DIY, aging test and other requirements thanks to complete test probes and output cable with alligator clips.

## Images

![DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade - Image 1](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71PQuloWYtL.jpg)
![DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade - Image 2](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71EfJXDYHDL.jpg)
![DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade - Image 3](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71H8FdQUMOL.jpg)
![DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade - Image 4](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71eiCjTNkFS.jpg)
![DC Power Supply Variable,0-30V 0-5A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade - Image 5](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71i7UEUfGkL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Performs as intended
  

*by K***E on Reviewed in the United States on January 8, 2020*

Good:*Product is sturdy, well made, light, and easy to carry.*Controls are easy to understand, and the LED display is easy to read regardless of the lighting conditions.*This is a 4-LED display so I can easily set it below 10mA for testing small 2V-6V devices where the leads are exposed.*Handles heat well. Used a short circuit for about 20-30 seconds to heat up a small piece of graphite, the graphite smoked and glowed brightly while the power supply was cold to the touch and didn't even need the fans to be on.*Alligator clips that come with the device seem to be of high quality and have very strong grip. They worked well with some projects that my others haven't done so well with.Bad:*A lot of times you'll try to raise the value of either the Voltage, Current, or sometimes both, and the display will say 0 for a while before jumping quickly to ~1.5A or ~12V or sometimes both. It's not been a huge problem yet but might be if you are working with something delicate.*This device isn't very capable of giving out low amperage (1mA - 10mA) while giving out high voltage (~25+V). It may just be the materials I've tested on but the lowest I got was ~30mA at ~28V using a very unorthodox material with presumably high electrical resistance compared to a lot of others I've tried. If you're interested in getting 1mA-10mA with around 25+V using a highly conductive electrode, this machine won't be able to generate it for you.

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
    Yo aquí reparó
  
  

*by A***Y on Reviewed in the United States on February 5, 2020*

Es muy cómodo y fácil de trabajar gracias

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works perfectly for all my maker projects
  

*by V***V on Reviewed in the United States on June 18, 2020*

I really like this power supply.This power supply works good for countless projects and the added USB port Is super convenient.Lightweight, accurate, convenient and the included test leads are Made from quality Materials.I would highly recommend.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.tn/products/137529430-dc-power-supply-variable-0-30v-0-5a-4-digital](https://www.desertcart.tn/products/137529430-dc-power-supply-variable-0-30v-0-5a-4-digital)

---

*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-03-14*