Third generation 3010D-III — 30V/10A Adjustable DC Bench Power Supply for Electronics & Repair 300W Switching Mode | Digital Encoder Knobs | Triple Readout Display | CC/CV Auto
KEY FEATURES
- 30V/10A Adjustable DC Power Supply (300W): Compact switching-mode bench supply with continuously adjustable output from 0–30V and 0–10A. Rated for 24-hour continuous operation at full load — more than enough for repair work, prototyping, and testing.
- Digital Encoder Knobs (Not Potentiometers): Unlike cheaper supplies that use standard pots with coarse/fine dials, the 3010D-III uses digital encoders. Turn slowly for 10mV or 1mA precision. Turn quickly for larger jumps. No need to short-circuit the terminals just to set the current — a genuine workflow improvement.
- Triple Readout Display (V + A + W): The 4-digit LED display shows voltage, current, and power output simultaneously. Most budget supplies only show two values — having all three visible at once saves you reaching for a multimeter.
- Auto CC/CV Switching: The supply automatically switches between Constant Voltage and Constant Current modes based on load conditions. Front panel LEDs show which mode is active, so you always know what’s happening.
- Built-In Protection: Short-circuit protection with audible alarm, overcurrent protection, and over-temperature protection. The temperature-controlled fan only kicks in when needed — stays silent during light loads.
- Ultra-Compact & Lightweight: At roughly 195 × 70 × 157 mm and just 1.9 kg, this is remarkably small for a 300W supply. Switching-mode design is what makes this possible — a traditional linear supply at these specs would be three times the size and weight.
- Series & Parallel Capable: Connect two units in series for higher voltage, in parallel for higher current, or symmetrically for dual-rail output. Flexible enough to grow with your bench.
PRODUCT DESCRIPTION
Why the 3010D-III
If you’ve ever tried to diagnose a faulty phone board or test an LED strip with a fixed-voltage wall adapter and a multimeter balanced on your knee, you know how quickly that setup falls apart. A proper bench power supply lets you dial in exact voltage and current, set a current limit so you don’t fry whatever you’re working on, and see exactly what’s being drawn — all from one unit on your bench.
The 3010D-III does all of that at a price that makes it genuinely accessible. It’s not competing with £200+ linear supplies for ultra-clean DC output — it’s a switching-mode supply, and it’s honest about what that means. What it does offer is 300W of adjustable power with proper digital controls, a triple readout, and real protection features, in a package smaller than a loaf of bread.
What You’re Actually Getting
Digital Encoder Knobs with Speed-Sensitive Adjustment. This is the feature that separates the 3010D-III from generic budget supplies. Traditional potentiometer knobs require you to fiddle with coarse and fine adjustments to hit a target voltage — and you often need to short-circuit the output terminals just to set a current limit. The digital encoders on the 3010D-III solve both problems. Turn slowly for 0.01V (10mV) voltage steps or 0.001A (1mA) current steps. Turn quickly and it ramps faster. It sounds like a small thing, but once you’ve used encoders you won’t go back to pots.
Triple Readout Display. The 4-digit LED shows voltage, current, and power simultaneously. It’s bright enough to read in any lighting condition — workshop fluorescents, direct sunlight, dimly lit repair benches. Having wattage visible alongside voltage and current means you can spot thermal issues and calculate heat dissipation without mental arithmetic.
Auto CC/CV Mode. The supply automatically switches between Constant Voltage and Constant Current modes based on your load. Front panel LEDs indicate which mode is active. If you’re powering a board at 5V and the current draw exceeds your set limit, it seamlessly drops into CC mode to protect your circuit. No switches to flip, no settings to change.
Protection Features. Short-circuit protection triggers an audible alarm. Overcurrent protection prevents damage to connected devices. Over-temperature protection shuts down the supply if the internals get too hot. The temperature-controlled fan runs only when needed, so during light bench work the unit is essentially silent.
Compact Switching-Mode Design. At 195 × 70 × 157 mm and 1.9 kg, you can fit this next to your soldering station without losing half your bench. The switching-mode architecture is what makes this size possible — it’s the trade-off for slightly higher output ripple compared to a linear supply, but for repair work, prototyping, and general testing, it’s a trade-off worth making.
Buzzer Feedback. An audible beep confirms adjustments and alerts you when protection modes trigger. You know the supply is responding without needing to stare at the display.
TECHNICAL SPECIFICATIONS
| YIHUA 3010D-III — Technical Specifications | |
|---|---|
| Type | Switching-mode adjustable DC bench power supply |
| Output Voltage | 0–30V DC (continuously adjustable) |
| Output Current | 0–10A (continuously adjustable) |
| Output Power | 300W (rated 350W) |
| Input Voltage | AC 220–240V / 50Hz (UK plug) |
| Voltage Resolution | 0.01V (10mV) |
| Current Resolution | 0.001A (1mA) |
| Power Resolution | 0.1W |
| Voltage Precision | < 0.1% + 0.03V |
| Current Precision | < 0.6% + 20mA |
| Load Regulation | < 1% + 10mA |
| Ripple & Noise | Vrms < 0.5% (10Hz–1MHz) |
| Display | 4-digit LED — voltage, current, and power simultaneously |
| Adjustment | Digital encoder knobs (speed-sensitive) |
| Modes | Auto CC/CV (Constant Current / Constant Voltage) |
| Protection | Short-circuit (with alarm), overcurrent, over-temperature |
| Cooling | Temperature-controlled fan (auto on/off) |
| Continuous Operation | Rated for 24 hours at full load |
| Series/Parallel | Yes — series, parallel, or symmetrical with second unit |
| Dimensions | 195 × 70 × 157 mm (≈ 7.7 × 2.8 × 6.2 in) |
| Weight | ~1.9 kg |
| Operating Temp | -10°C to 40°C |
| Humidity | < 90% relative |
WHAT’S IN THE BOX
✓ YIHUA 3010D-III DC power supply unit ✓ Test lead with 0.4m alligator clips ✓ Ground wire ✓ UK power cord and instruction manual
Worth knowing: The accessory kit is basic — you get what you need to start using it, but serious bench work benefits from proper banana-plug test leads, a decent set of hook clips, and silicone wire in various gauges. These are inexpensive add-ons that make the supply much more practical day to day.
HOW IT COMPARES
The question at this price point is straightforward: why the YIHUA over the other budget 30V/10A supplies flooding Amazon?
The closest competitor is the HANMATEK HM310, which sits at a similar price (£50–65) and matches the 3010D-III on most specs — 30V/10A, 300W, digital encoders, 4-digit display. Where the HANMATEK pulls ahead is the dedicated output on/off button (the YIHUA’s output is always live when powered on) and a built-in USB charging port. Where the YIHUA wins is the simultaneous power readout (voltage + current + watts on screen at once), the 24-hour full-load continuous operation rating, and the backing of an established brand with readily available spare parts.
Below the 3010D-III, supplies like the RUZIZAO 30V/5A (£25–35) cut cost by halving the current to 5A, using potentiometers instead of encoders, and generally offering flimsier build quality. They work for basic tasks, but the encoder knobs alone make the YIHUA worth the step up.
Within the YIHUA family, the 3010D-III is the solid mid-generation model. The 3010D-IV and 3010D-V offer incremental refinements — larger screens, improved ripple specs, better CC/CV switching — but at a higher price. The III remains the value pick for most hobbyists and repair techs.
BEST USE CASES
Phone and electronics repair — powering boards at controlled voltage with current limiting to catch shorts during diagnostics. This is where the 3010D-III earns its keep. Suitability: excellent.
Hobby electronics and prototyping — powering Arduino projects, ESP32 boards, LED strips, motor drivers, and custom circuits from a reliable adjustable source. Suitability: excellent.
LED testing and driver development — the adjustable current limit is essential for testing LED strings without burning them out. The wattage readout helps with thermal calculations. Suitability: very good.
Battery charging simulation — testing charge controllers, BMS boards, and battery-powered devices at controlled voltage and current. Suitability: very good.
Education and lab environments — students learning about Ohm’s law, voltage dividers, and basic circuit behaviour. The encoder knobs and clear display make it easy for beginners to use safely. Suitability: very good.
Amateur radio — powering transceivers and accessories. Works well, though some users note the switching noise can be picked up on certain bands. A ferrite choke on the output leads usually sorts this. Suitability: good (with minor filtering).
Precision analogue work and audio circuits — this is where the 3010D-III isn’t the right tool. Switching-mode supplies inherently produce ripple noise that can affect sensitive analogue circuits, audio amplifiers, and precision measurement setups. For these applications, you need a linear bench supply. Suitability: not recommended.
A QUICK NOTE ON SWITCHING NOISE
The 3010D-III is a switching-mode power supply, and that comes with a trade-off every buyer should understand. Switching supplies convert mains AC to DC using high-frequency switching — that’s what lets them be small, light, and efficient. The downside is output ripple: small high-frequency voltage fluctuations superimposed on your DC output.
For the vast majority of bench work — powering digital circuits, repair diagnostics, LED testing, motor driving, battery simulation — this ripple is completely irrelevant. Your Arduino doesn’t care about 50mV of high-frequency noise.
For noise-sensitive applications — precision analogue design, audio amplifier testing, sensitive RF work — it matters. If that’s your primary use case, a linear power supply (heavier, larger, more expensive) is the correct tool.
The 3010D-III’s ripple spec is < 0.5% Vrms across 10Hz–1MHz, which is typical for this class of supply. Some users have improved this further by adding a small LC filter or ferrite choke to the output leads.
FREQUENTLY ASKED QUESTIONS
What’s the difference between the YIHUA 3010D, 3010D-III, and 3010D-V?
The 3010D family has been through several generations. The original 3010D uses potentiometer knobs and a dual display (voltage and current only). The 3010D-III upgrades to digital encoder knobs, a 4-digit display, and adds a simultaneous wattage readout — it’s the biggest jump in usability. The 3010D-IV and 3010D-V refine things further with larger screens and improved ripple specs, but at a higher price. For most hobbyists and repair techs, the III is the value sweet spot.
Can I use the YIHUA 3010D-III for phone board repair?
Yes — this is one of its most popular use cases. Set the voltage to match the phone’s battery voltage (typically 3.7–4.2V for most smartphones), set a current limit (usually 1–2A to start), and connect to the battery pads or test points on the board. If the board has a short, the current limit protects it from further damage, and you can use the current draw reading to help locate the fault. The wattage display is a bonus for spotting abnormal power consumption.
Where can I buy the YIHUA 3010D-III in the UK?
In the UK, the YIHUA 3010D-III is available from Kunkune — a trusted UK-based retailer stocking YIHUA equipment with UK-spec power cords and fast domestic shipping. No drama, no customs charges.
THE BOTTOM LINE
The YIHUA 3010D-III is the bench power supply that proves you don’t need to spend a fortune to get proper adjustable DC on your workbench. The digital encoder knobs are the standout — once you’ve used them, potentiometer-based supplies feel like winding a clock. Add the triple readout, solid protection features, and a footprint that doesn’t dominate your bench, and it’s easy to see why this is one of the most popular budget supplies in the hobbyist and repair community.
Is it a precision instrument? No. It’s a switching-mode supply with the ripple that comes with that territory. But for the work most of us actually do — powering boards, testing circuits, diagnosing faults, running projects — it does the job well, and it does it at a price that’s hard to argue with.
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