DC Power Supply Variable 0-120V 0-3A Bench Supply - Precise Encoder

In this review we look at the HANGELL DC Power Supply Variable 0-120V 0-3A and who will benefit from its feature set. The bottom line: this bench supply is best for hobbyists, makers and small lab users who need fine, repeatable control of voltage and current. The standout reason to buy is its precise encoder knob with coarse and fine adjustments, which makes setting voltage and current faster and more accurate than a traditional analog dial while still remaining affordable.

Key Features

• Precise encoder knob: The encoder provides high precision and stability with coarse and fine adjustment and digit switching by pressing the knob, making it easy to dial in exact voltage and current values.
• Output switch button: A dedicated output button lets the user safely enable or disable output without altering stored voltage and current settings, protecting connected loads.
• Short circuit alarm and protections: OCP with a buzzer plus overvoltage, overcurrent, overtemperature and overload protections improve safety for the supply and the device under test.
• High-precision display: A 4-digit LED display offers 0.01V and 0.001A resolution and an indicator for CV/CC mode, helping confirm operating conditions at a glance.
• Front USB and Type-C quick-charge: Built-in 5V 3.6A USB and Type-C charging provide convenient power for small devices and peripherals alongside the main output.
• Included accessories and support: The unit ships with input and output power cords and a user manual plus lifetime technical support from the maker.

Who It's For

This bench supply suits electronics hobbyists, prototype builders and educational labs that need a compact, regulated lab supply with accurate numeric control and safety features. The encoder knob makes iterative testing and precise adjustments practical for bench work and small projects.

Those who need extremely high-end lab instrumentation, multi-channel supplies, or guaranteed lab calibration certificates should look elsewhere, as this product is positioned as an accessible, single-output regulated supply rather than a professional multi-channel system.

Pros & Cons

Pros

• Very precise encoder control with coarse/fine adjustment improves setup speed and repeatability.
• Comprehensive safety: OCP short circuit alarm plus overvoltage, overcurrent and overtemperature protection.
• High-resolution 4-digit LED display with clear CV/CC indication and readable digits even in lower light.
• Onboard 5V 3.6A USB/Type-C quick-charge adds convenience for powering accessories.

Cons

• Some users report mixed experience with display behavior and cord quality, so expect minor variability between units.

Specifications

Output range	0-120V
Maximum current	0-3A
Display resolution	0.01V / 0.001A (4-digit LED)
Front ports	5V 3.6A USB and Type-C quick-charge
Controls	Precision encoder knob with coarse and fine adjustment and output switch button
Safety features	Short circuit alarm (OCP), overvoltage, overcurrent, overtemperature, overload protection
Package contents	Power supply, input power cord, output power cord, user manual

Our Verdict

The HANGELL DC Power Supply Variable 0-120V 0-3A is a strong value for hobbyists and small labs that need accurate numeric control, clear readouts and solid safety features. Its precise encoder knob and built-in USB/Type-C charging make it versatile for bench work. While not a replacement for high-end laboratory-grade multi-channel supplies, it delivers dependable performance and convenient protections at a reasonable price.

Frequently Asked Questions

Does this supply offer short circuit protection?
Yes. With OCP enabled the unit stops output and sounds a buzzer on short circuit, and it also includes overvoltage, overcurrent and overtemperature protections.

How fine are the adjustment steps?
The display shows 0.01V and 0.001A resolution and the encoder provides coarse and fine adjustment modes for precise setting.

What comes in the box?
The package includes the variable DC power supply, an input power cord, an output power cord and a user manual plus lifetime technical support.