Bench Power Supply Full Review (variable 0-30V & 0-10A)

Bench Power Supply 30V 10A 110V Variable Output

This DC Power Supply features a very high quality variable 0-30V and current 0-10A. It comes with high reliability, low noise and circuit overload protection.

-Steady DC
-All Metal Construction
-Compact Design
-Dual LED Display
-Current mA Display
-High Stabilized Output Voltage
-Short Circuit Protection
-Over Loading and Current Protection

-Size: 13.4 x 7.5 x 8.6 inch
-Weight: 17 lbs

Operating Conditions:
-Supply Voltage: AC 110V
-Frequency: 60Hz
-Working Temperature: -10°C to 40 °C

Stable Voltage:
-The output voltage is between 0 and nominal value continuously adjustable
-Voltage Stability: ≤0.01% +2mV
-Load Stability: ≤ 0.01% +2mV
-Recovery Time: ≤100μS
-Ripple Noise: ≤1 MVRMS – effective value
-Temperature Coefficient: ≤ 200PPM/°C

Stable Current:
-The output current is between 0 and nominal value continuously adjustable
-Power Stability: ≤ 0.1% + 3mA
-Load Stability: 0.2% + 3mA
-Ripple Noise : ≤2mArms


John Taylor says:

I have a custom made battery pack made out of 324 Panasonic AA Eneloop batteries (Eneloop AA factory spec = 1.2 V/1900 mAh; actual tested spec = 1.43V/1.85 Ah which I will use for this example). Said battery pack has 9 AA batteries wired in series per column (9 x 1.43V = 12.87V/1.85 Ah) x 36 columns wired in parallel (36 x 1.85 Ah = 12.87V/66.6Ah). A freaking awesome 12.87 V/66.6 Ah battery pack that just keeps on going and going and going. However, when it comes time to charge the batteries, I spend about an 45 min taking the batteries out and putting them into the 4 bank charges that came with the batteries, then another 45 min taking them out of the chargers to put them back into the battery pack….yes, a royal pain in the butt.

I have considered a 10 amp battery charger, but I have determined because I need to charge precisely to 12.8 V that I would be better off using a 12 VDC 10 amp variable power supply instead so that I can fine-tune it accordingly. I typically charge the batteries at 50% depletion so it should take me 3 hours or so to charge the battery pack at 10 amp.

Question: Can I do this with this power supply? I assume there is no danger of overcharging because once it charges the battery pack to 12.8 V it just quits? Thanks for any help you can provide in this regard.

micro mobile tech says:

good morning sir,
sir i have one maxx dc power supply for mobile repairing
when i connect the phone to the power supply and switch on the mobile device i found that current meter is fluctuating from 30 to 50 constantaly in every device so please tell me what is the problame

Brian Wallace says:

would I be able to use this to power an induction coil I bought from Amazon?

Elizabeth Greene says:

Mine has an issue where it has trouble regulating below 300mA. Does yours?

Robert L Erwin Jr says:

I have a question… I just bought the same model (QW-MS3010D). With or without the meter attached, my CV (Constant Voltage) indicator light flickers at or between 3 and 6 VDC. In addition I hear a clicking sound while the CV light flickers. My question is – is this supposed to happen? I don’t think I need to be an electronics guru to know something isn’t right – do you agree? When I watched your video, you CV light doesn’t flicker, it stays solid. What are your thoughts on this? Any help is appreciated. Thanks in advance. 🙂

M Kasbal says:

**GOOD REVIEW** I may be able to save some people a lot of time here….this is the best and most comprehensive review of this power supply on YouTube…I know, because I wasted hours looking through videos.

Xenon777 says:

What is the purpose of the strip of metal between the ”Negative” and ”Ground” and will it cause any problems if I remove it?

Vallen Larsen says:

Thank you for the video. Did you calibrate the meters at all? I also noticed the trim pots under the meters. Are they for calibration? Thanks.

Blondie SL says:

I wonder, have you done any further tests to confirm if the amp meter is accurate. In your video, it seems the voltage meter is very close to your Fluke.

But since you didn’t also have an amp meter running as well, no way to know if the built in amp meter is accurate.

I ask because I’ve seen other videos of other units, that are clearly from the same manufacturer (just different branding names)… and 1 vid in particular, the amp meter is way off. Not even close. Actually, neither is the volt meter. The guy set it to 5v on his external meter then adjusted the pot inside the power supply to match. But when upping the voltage, the built in went way out as compared to the pro meter.

I’m hoping to avoid this situation before buying one of these.

Or does anyone else have this meter and can confirm if now, in 2016, the latest versions have accurate readouts?

Thanks in advance.

Jaroslav Chytil says:

Hi i want to ask you if everything is solved by eletronic or inside is transformator

Thomas Lindner says:

Think about Ohm’s law! You missed something!

Арxитектор Вселенной says:

what kind of review is that ??? 900mA ???could you go up to 10 amps or its a secret

WaveFire Chris says:

im looking to buy my first bench psu and this one looks to be the best

Arameh says:

you’re looking at C $170 for a 5 Amp 30V. The prices of everything has just skyrocketed. I pray that we can feed ourselves in the coming years.

Flip-Flop says:

My friend, did it come with a schematic diagram, or just an instruction manual?

Those settings that have two adjustment buttons on top, what do they do?

devin elliott says:

thank you for the video i thought my power supply was broken straight out of the box lol well once again thank you for taking time to make this video you’ve definitely saved me from looking like a total idiot lol

sparky12x says:

I purchased one of these on ebay. It has a switching power supply that seems to work well.
Except for the fact that when it is turned on it kills all AM radio reception for at least a 1/2 mile around it.

I can game 2745 I says:

Why is the earth and negative shorted

Geoff Weather says:

I have this same psu and it seems to be very steady throughout the full range 0v to 32v I am very pleased with it, If I remember likely I only paid £38.99 from china for it.
I would recommend this to anyone whom would use this for there main desktop power supply who is on a budget (there are lots of these out there that look the same so make sure you check out the model no’

BlackHoodProductions says:

Great video, and a nicely done description on how to operate those lower end power supplies. I’ve always wondered how the current limiting was done without all of the bells and whistles with those.

Gr@ssoft says:

I have a LW-3010KDS Power Supply 30V 10A but I don’t understand why the max voltage is 26. I turn my voltage knob to the max but doesn’t reach the 30V. Do you know why?

iMeMySelf says:

Do you have a radio running somewhere in the house or is that your wife moaning in the background? 🙂

Burger Birger says:

Does it still work? Have you ever connected it to a scope to check what kind of ripple it puts out? I’m considering buying one of ebay.

Autunite says:

I’m thinking about buying this for my workshop where I have a lot of different eBay electronics and lights, mostly 12V and 24V. What I thought was a bit poor with this is that it doesn’t show less than 0.1A, but if I need an accurate reading of the current I can always hook up a multimeter in series with it.

It costs about $75 on eBay right now, the same model number as this.

hari haran says:

what happens if we short gnd and – terminal together….?

raymond cwieka says:


LEDBuilder dot org says:

Heh, he said he’ll show you how to use it with your load.

R-77 says:

how does it know to not deliver more amps and blow the light bulb or the radio ?


Aio Iredia says:

Hello, I purchased this exactly this DC power supply on eBay buy just it blew up when switching it on, I would recommend this cheap Chinese death traps.

James Parker says:

well good

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