Variable DC Power Supply

Empower your devices with a reliable DC Power Supply for uninterrupted performance and heightened efficiency. Our carefully crafted Variable DC Power Supply solutions are designed to meet the demands of various applications, providing stable and reliable power output for your devices.

How To Choose The Best Variable DC Power Supply

Power Requirement

Determine the power needs of your device or system, considering voltage, current, and dc power output requirements.

Load Characteristics

Assess load characteristics for compatibility with power supply stability and precision, considering sensitivity to fluctuations.

Noise Levels

Opt for dc power source with low noise levels to minimize interference and ensure smooth operation in noise-sensitive environments.

Safety Protection

Look for dc power supplies with comprehensive protection features such as overcurrent, overvoltage, and short-circuit protection to safeguard your equipment.

Choose The Variable DC Power Supply Right For You

Our variable dc power supplies include: programmable power supply, bench power supply, high voltage power supply, and high precision power supply. You can choose the appropriate dc power supply based on your specific requirements from our product range.

Popular DC Variable Power Supplies

Hot Sale Variable DC Power Supplies

DC Power Supply Variable New Arrivals

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Hot Sale


Variable Switching DC Bench Power Supply 30V/10A (eTM-3010F)

Original price was: $ 99.00.Current price is: $ 92.50.

Programmable DC Bench Power Supply 30V/10A(eTM-3010P)

Original price was: $ 99.00.Current price is: $ 89.00.

30V/10A Adjustable Switching DC Bench Power Supply (eTM-3010)

Original price was: $ 99.00.Current price is: $ 89.00.

Mini 30V/10A Variable DC Power Supply Programmable (eTM-3010MP)

Original price was: $ 99.00.Current price is: $ 89.00.

What Is Variable DC Power Supply?

The variable dc power supply, also known as adjustable dc power supply, is an electrical device that converts ac into a steady, dc power output. One of its key features is the ability to regulate the output voltage, current, or both, which makes it highly adaptable for diverse applications.These dc power supplies find wide application in circuit board detection, mobile phone detection, as well as scientific research and teaching units, encompassing all situations that require a dc regulated power supply.

Function & Advantage

High Resolution

Boasting high-resolution output settings, our high precision dc power supply delivers finely-tuned voltage and current adjustments, enabling users to achieve precise and accurate power output for even the most demanding experimental setups.

Support Programming

Our programmable dc power supply is equipped with advanced programming capabilities, allowing users to set precise voltage and current levels according to their specific requirements. This feature provides unparalleled flexibility and control, catering to diverse experimentation and testing needs.

Multiple Safety Protections

Safety is paramount, which is why our variable dc power supply incorporates multiple layers of protection, including leakage protection, overvoltage protection, overcurrent protection, overheating protection and short circuit protection. These safety features guarantee the protection of connected devices and mitigate the risk of potential damage.

CV/CC Automatic Conversion

With its CV/CC automatic conversion function, our dc bench power supply seamlessly adjusts between constant voltage (CV) and constant current (CC) modes, ensuring stable and reliable power delivery across a wide range of applications. This intelligent conversion mechanism facilitates efficient and secure operation for various electronic devices and systems.

What Is Adjustable DC Power Supply Used For?

The application of variable dc power supply is extensive, serving various industries that require a stable and reliable dc power source, including:

Electronics Testing

DC power supplies are extensively used to test electronic devices like circuit boards, integrated circuits, and semiconductors, providing stable power for precise performance evaluation and troubleshooting.

Experiments and Research

In research labs, dc power supplies are vital for a diverse range of experiments in physics, chemistry, and engineering. These experiments often involve precision research that requires a reliable and adjustable dc power supply.

Industrial Manufacturing

Within the realm of industrial manufacturing, dc power supplies play a critical role in powering various machinery and equipment, ensuring consistent and reliable operation of automated systems and production lines.


DC power supplies are crucial for telecommunications and information technology infrastructure, providing power for networking equipment, servers, and devices, ensuring continuous communication and data transmission.

Switching Or Linear DC Power Supply: Key Difference

There are two categories of power supply: Linear Power Supply, which offers simple design and low-noise operation, and Switching Power Supply, known for its high efficiency. Each power supply possesses its distinct benefits and serves varied requirements.

FeatureLinear Power SupplySwitching Power Supply
NoiseLow NoiseNoisy
Energy-Conversion LossMuch LossLess Loss
Response of Load FluctuationFastSlow

How To Use The Adjustable DC Power Supply Safely

Refer to the Manual

Before using the DC power supply, read and understand the user manual thoroughly to grasp essential safety instructions, operational guidelines, and potential hazards.

Avoid Moisture

Keep dc regulated power supply and associated equipment away from water or moisture to prevent electrical hazards and damage. Store the power supply in a dry area.

Follow Voltage and Current Limits

Operate within the recommended voltage and current limits for connected devices to avoid equipment damage and electrical hazards.

Perform Unit Inspection

Conduct regular inspections of the dc power supply machine to identify any signs of damage or deterioration. Verify that all components, such as cables and connectors, are in optimal condition before utilization.


If you encounter any operational uncertainties or technical issues, seek guidance from a qualified professional to ensure safe and proper usage of the adjustable dc power supply.

Disconnect During Maintenance

Always disconnect the power supply from the electrical source when conducting maintenance to prevent electric shocks or short circuits. Seek professional help if needed.

Adjustable DC Power Supply Videos

Explore our comprehensive collection of informative adjustable dc power supply videos to gain a deeper understanding of power supplies. Our video series provides in-depth insights into the functionality, features, installation and operation instructions of dc power supplies. No matter if you are a seasoned professional or a newcomer in the field, these videos provide valuable guidance, tips, and demonstrations for you. 

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WPS3010H Bench Power Supply Review and Unboxing

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LFC#206 – Bench PSUs and stuff you can do with them

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HM305P/HM310P Power Supply: Beep On/Off, Updated Manual, Software

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Best Low Cost Power Supply by Kaiweets

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Rockseed RS305P Fuente ajustable 30 Vdc/5A

Variable DC Power Supply FAQ

Q1: What Is DC Bench Power Supply?

The dc bench power supply is a versatile electronic device that provides a stable and adjustable dc power output, allowing users to control voltage and current levels for various electronic testing and experimentation purposes. Often furnished with an intuitive interface, bench power supplies are indispensable instruments for testing, and troubleshooting electronic circuits and devices.

Q2: What Does Programmable DC Power Supply Refer To?

DC Programmable Power Supply refers to a power supply unit that can be controlled and adjusted by users to provide a specific output voltage and current. Its programmability allows customization for various applications, such as laboratory research and product manufacturing.

Q3: How Does A DC Regulated Power Supply Operate?

The dc power supply functions by delivering steady direct current to operate a component, module, or device. Typically, dc power supplies operate in two modes: Constant Voltage (CV) mode, where the output voltage is regulated according to user settings, and Constant Current (CC) mode, where the power supply controls the current flow.

Q4: How To Choose The Right Size Of Adjustable DC Power Supply?

When selecting an appropriate variable dc power supply, take into account essential factors such as voltage and current requirements, efficiency, and potential future needs.

Q5: How Can I Link Two DC Power Supplies In Series?

To connect two dc power supplies in series, set each power supply’s output to half the total desired voltage (if using two outputs) or to a fraction for more outputs. Ensure the outputs have identical voltage and current ratings, and be cautious not to exceed the floating voltage rating.

Additionally, keeping the wiring short and bundling the leads to reduce the loop area between the power supply and the load. The diagram provided below demonstrates the appropriate connections to accomplish this.

Q6: How To Connect Two DC Power Supplies In Parallel?

To supply extra current to a device under test, you can parallel-connect power supplies. Ensure that all outputs share an equal current limit, summing up to the desired total current limit value. The diagram illustrates the correct parallel connection of two dc power supplies.

Follow guidelines:

a. One supply must operate in constant voltage (CV) mode, the other(s) in constant current (CC) mode.

b. Connect outputs with identical voltage and current ratings.

c. Wire remote sense terminals in parallel.

d. Keep wiring to the load as short as possible and twist/bundle leads to minimize inductance and noise.

Note:Set the CV supply’s voltage slightly lower than the CC supplies to prevent control conflicts or oscillations.

Q7: How To Test A Variable DC Power Supply?

To test a dc power supply, you can utilize various methods such as continuity testing, voltage testing, load testing, and ripple testing. These methods ensure the power supply operates at its best and complies with the necessary standards.

Continuity test: Using a multimeter set to the continuity setting, touch the power supply’s positive and negative terminals with the multimeter leads. The multimeter will beep if continuity is present. This test aids in verifying the power supply’s functionality and identifying any potential wiring faults.

Voltage test: Using a multimeter set to the DC voltage setting, connect the multimeter leads to the power supply’s positive and negative terminals. The multimeter will display the supplied voltage. Compare this value to the power supply’s rated voltage to confirm it falls within the appropriate range.

Load test: Conduct this test by linking a load, like a light bulb or motor, to the power supply, then measure the voltage and current using a multimeter. Ensure that the voltage remains constant within the anticipated range and that the current stays within the power supply’s specified current limit.

Ripple test: Measure the AC portion of the power supply’s output voltage by connecting an oscilloscope to the output terminals. Assess the voltage ripple, aiming for minimal ripple voltage that falls within an acceptable range.

Note: Ensure safety precautions are followed, referring to the manual, or seeking professional assistance when needed, especially for those less experienced in electronic testing.

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Development Team

4000 m³

Factory Area

10 +

Number of Production Lines

10,000 +

Monthly Production Capacity

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ETOMMENS boasts a proficient development team and maintains strong collaborations with numerous R&D institutes. Proficient in various operating systems, hardware, programming, and communication technologies, we have effectively pioneered a diverse range of top-tier power supplies in conjunction with enterprises.

These power supplies encompass variable DC power supply, programmable DC power supply, DC bench power supply, high voltage DC power supply, and more.

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