DC Power Supply Variable Bench Power Supply with Encoder Knob

In this review of the DC Power Supply Variable bench unit, the bottom line is simple: it is a compact, accurate option for hobbyists and small labs who need precise voltage and current control without a large footprint. The standout feature is the high-precision encoder knob that allows numeric digit-by-digit setting for voltages and currents, making repeatable adjustments far easier than with a conventional rotary knob. The unit also adds practical touches such as an output enable/disable button, an 18W USB fast charging port and an audible short circuit alarm, which together make it a useful bench companion.

Key Features

• High-precision Encoder Knob: The encoder knob lets you press to select a digit and turn to change each digit 0-9, giving highly repeatable and accurate setpoints.
• Output Enable/Disable Button: A dedicated output button prevents accidental powering of a load and makes it quick to toggle the output without changing settings.
• Overcurrent Protection with Alarm: Built-in OCP will stop output and sound a buzzer if a short or overcurrent is detected, protecting both the supply and the device under test.
• Precise 4-digit LED Display: The high-definition display shows readings to 0.01 V and 0.001 A and indicates CV or CC mode while offering adjustable brightness.
• USB Fast Charging Port: An 18W fast charge output provides convenient charging for phones or small devices while you work on electronics.
• Compact and Lightweight: At roughly 7.51 x 3.56 x 5.81 in and about 1.15 kg, it saves bench space and is easy to carry between workstations.

Who It's For

The DC power supply is aimed at electronics hobbyists, repair technicians, and small laboratory users who need accurate, repeatable voltage and current settings in a portable package. The precise encoder and 4-digit display make it useful for tasks that require fine adjustment like sensor calibration, module testing, or bench repairs.

Those who need very high output power, multiple channels, or industrial-grade ruggedness should look elsewhere; this model is best for single-channel, low- to medium-power work and everyday bench tasks rather than heavy industrial use.

Pros & Cons

Pros

• Accurate numeric adjustment via the encoder knob for repeatable setpoints.
• Practical safety and convenience features including an output enable button and OCP short circuit alarm.
• Compact size and built-in 18W USB fast charging make it a versatile bench companion.

Cons

• Build quality receives mixed feedback; some users notice cheaper materials compared with higher-end supplies.
• Not suited for high-power or multi-channel applications where greater output or isolation is required.

Specifications

Our Verdict

For hobbyists and small lab users who want a compact, accurate single-channel DC supply, this unit delivers strong value thanks to its numeric encoder adjustment, clear 4-digit display, and helpful safety features. It is not a replacement for a high-end or multi-channel laboratory supply, but for everyday bench work and portable use it is a practical, cost-effective choice.

Frequently Asked Questions

Does it protect against shorts?
Yes. When OCP is enabled the supply will stop output and sound a buzzer if an overcurrent or short occurs.

Can I charge a phone from it?
Yes. The unit includes an 18W USB fast charging port suitable for charging phones and small devices.

Will it work on 110V mains?
It supports AC 230V/115V; if your area uses 110V you must flip the voltage switch on the rear to 115V for full output performance.