Longwei LW K3010D 30Volt 10Amp variable power supply review and tear down

Picked this one up at Banggood. Here is the link
110V/220V 0-30V 0-10A Adjustable Digital DC Power Supply -- goo.gl/hb5WYA
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[@JerryEricsson]

Back in '71 when I was in Vietnam, I started playing around with batteries that we had, I served in communications, so we had plenty of batteries on hand. One night I was really bored (a thing that came very naturally there back then) and dug out an old Magnesium battery for our backpack radios, the AN/PRC-77 (successor to the PRIC-25 of song and legend). I would stick a piece of commo wire (WD-1) in the negative, another in the 17 volt (if I recall right) and I could make the copper wire of the WD-1 glow and heat up enough to light a Kool, but the steel strands was where the magic lived, could actually run a bead of weld with that big old battery using the copper leads to form the ground and the steel to melt the metals together! Why I was having a GREAT time, till one of the cells exploded with a tremendous bang! Half the unit must have come awake, all wondering where the fire was coming from. Well now I was sure as hell not going to tell anyone it was me, there were men running to the bunkers for cover, search lights came on in the guard towers around the unit, and there I sat with my battery and some commo wire with the old Alfred E. Newman grin thinking "What, me worry?"

[@daviddyessii1126]

This was worth reading!! LOL

[@1959Berre]

@@daviddyessii1126 I love the smell of battery in the morning.

[@so4verage1g65]

i appreciate that he says solder and not sauter :)

[@ManofCulture]

It traveled a longwei from banggood to your bench.

[@davidgriffin79]

Groan.

[@brianh.000]

chuckle.

[@pleasecho2]

I checked and there's a US supplier

[@ganko2240]

A real knee slapper.

[@user-gs9id2cy2z]

Having run one of these PSU's here for several months I have found it to be a very useful addition to the work bench with one proviso. After much use the multi turn voltage control potentiometer became intermittent causing the output voltage to swing about unpredictably whilst trying to make adjustments. On investigation the problem was quickly located to the potentiometer which appeared to be of dubious quality. A new more reliable multiturn (10K) was fitted and the problem was easily fixed.

[@12voltvids]

Interesting. Mine is used all the time and i have had it since i did this video. No issues with it yet.

[@user-gs9id2cy2z]

@@12voltvids Keep an eye on it would be my advice, the voltage on mine started jumping around alarmingly (including upwards) when adjusting the multiturn and was most noticeably when monitored on a moving coil meter.

[@jacktheripper6716]

Had my eye on this power supply for a while just waiting for a trusted review before I ordered it. Ordered and on its way.. Keep up the great work.

[@12voltvids]

Yes this one is a winner.

[@santi0797]

three vids in one day, great work!

[@12voltvids]

Yup, been working on them all week, and finished them today. Then I cleaned up my bench, so the next one will be on a clean bench. Spoiler alert, that will be a record changer overhaul. A BSR this time.

[@santi0797]

That will be an interesting overhaul, cant wait to see it!

[@tbbw]

I always herd that amateur radio guys don't like switch mode power supplys but until now i have not herd/seen a practical example of why. Thanks for sharing :)

[@12voltvids]

They can throw noise into the receiver. Some are better than other. Most of the ones designed for the ham radio market have pretty good filtering. This one isn't bad, the other one terrible. Remember I am holding the antenna next to the power supply, and I had a little F'up here. I had the power supply plugged into my isolation transformer, so the cabinet was NOT grounded. The other supply (the noisy one) was grounded, and it still threw up more noise. I have since moved things around here, and plugged this one in directly into a grounded outlet, and I am happy to report that the noise is considerably lower with the metal cabinet earthed.

[@umajunkcollector]

IMHO: It's simply old school, BIGGER IS BETTER, we like heavy iron over those whimpy toys. It's sort of like a '59 Buick Wildcat vs a '99 Ford Escort.

[@jeffescortlx]

While linear power supply have the advantage of simplicity, some applications require switching power supplies. Computers haven't had linear PSU for a good 30 years. Can you image a laptop with a 60 watt transformer? Also flat screens wouldn't be flat without switching power supplies. Also have to ask, haven't you seen the crash test video's of old vs new cars? With car's from the 60's, you become the crumple zone.

[@12voltvids]

There used to be a saying about old cars "unsafe at any speed" and then there was the old 60's era Mustangs with the solid steering column. It was referred to as "Spear O Matic" because a small front end crash usually resulted it the driver being impaled on the steering shaft. Nope I'll take a new car any day over an old one. I won't even take a ride in an old car these days. They are nice to look at, and they look cool cruising down the road, but nope, not for me. I like all the safety features of new cars, stability control, anti lock brakes, scarebags ect. Now, linear power supplies work good at some things. Like the AC distribution network. For reliability a big ass transformer, and full wave bridge rectifier and big filter cap will get the job done. At about 65% efficiency. A good switch mode PSU will also get the job done, at about 95% efficiency. Hell televisions haven't used power transformers since tube went away. All modern solid state TVs used a hot chassis, and a 130V linear regulator connected directly to the rectified AC line. That supplied the horizontal section, which drive the flyback transformer. All the low voltages for the rest of the set were taken off secondaries wound on the flyback transformer. Guess what type of power supply that was. Yup you guessed it, a switching power supply. In this case the switch was operating at a fixed frequency at the horizontal scan rate. The voltage on the secondaries was controlled by regulating the raw DC voltage.

[@jacktorse2145]

FYI, the Wildcat didn't come out until '62

[@isoguy.]

Awsome, must buy one, thanks for the rview, been looking for a 10A supply some time but needed a trusted review

[@BogdanSerban]

It's got an auxiliary power supply for the control circuitry, probably made using the TNY integrated switcher, a gate drive transformer for the main switching transistors and the main power transformer.

[@7c3c72602f7054696b]

Thanks for the review, looks to be like a solid supply. I had a Xantrex unit that was great but things happened and now I need a replacement.

[@karlschwab6437]

Good review, thanks for all the details.

[@terrywilson4118]

I have a supply at work that can deliver up to 10,000 Amps @ 15 Volts... It supplies DC to a chrome plating bath....the rectifiying diodes in it are huge....

[@TimeFadesMemoryLasts]

pic or it didn't happen

[@12voltvids]

Our 48 volt power supplies at work can supply virtually unlimited current. There are 5 battery strings each with 24 cells in series. Each cell is 4 feet by 2 feet by 2 feet. That's 120 cells in total. The bus bar is solid copper 6" x 2"

[@therider3939]

Try using ferrite ring in the wire to filtrer the high freq

[@zx8401ztv]

Thats a nicely made switchmode :-D, nothing nasty inside and slim. Only one thing is missing, an output power switch, but thats easy enough to put in line with the cables. A CB radio or ham radio power supply is ideal for car radios, usually linear so no row.

[@andytipping70]

looking at buying one of these so was really interested in your review. on a side note, something you mentioned intrigued me. if that radio was AM, how would you expect to get stereo on 1440?

[@gardyfaustin8707]

Hello . U seem like the right person to ask this question ... I have the same . I accidentally plugged the NEGATIVE in the positive spot . And the POSITIVE in the negative spot . IN THE UNIT ITSELF .I plugged to charge my lithium bank ... Total failure .... Only the amp numbers move when I turn the knob ..... And the VOLtAGE numbers stay at zero no matter how high I turn it up .... I opened it and didn't see any fuse .... Please help as you seem very wise about this item ... Thanks was going to change the diode . It not sure .

[@12voltvids]

Probably the mosfet regulator. I blew up one of my other power supply and did a repair video on it.

[@gardyfaustin8707]

@@12voltvids ok thanks . I appreciate it

[@throttlebottle5906]

you should check the voltage when turning it on and off via power switch (on a scope), wouldn't be surprised if it turn on spikes 30V +

[@hotrex7779]

Hi I have just returned the 60 volt 5 amp version it gives you current control from about 100ma up to 5 amp . But a problem I had was if you set say 100ma while testing some circuits and inadvertently cause a short or have something switch that causes a overload the supply did not limit at 100ma but allowed a surge current to flow while the output caps discharge then it current limits at 100ma I have not seen this shower on any review. Would be nice to see what surge the 10amp one would give

[@paulbarua]

12:10 My old man had this exact car stereo in his Volvo back in the 1980s.

[@12voltvids]

Ah yes the old Philip's cquam am stereo radio. I hung onto this only because it has am stereo.

[@oggyosbourne]

Insurance tube replacement HAHAHAHA very nice translation there.... Thanks for the laugh :P Nice video Dave!

[@em0_tion]

sounds like a wife, asking for divorce xD

[@Sloxx701]

Good video. Wouldn't the antenna itself be picking up noise being held that close to the supplies?

[@rfnoise]

It would have been nice to 'scope the output under your demonstrated loads, but thank's for the evaluation, gives us a much better idea of how it operates.

[@poypiedlajego78]

What's the protection diode symbol onn the output there? 1N540___? The D30 diode, that is...

[@johnbell1859]

Just ordered one of these it looks good, glad l ordered this make. Great review. 🇬🇧🇺🇦🇺🇸

[@12voltvids]

Been using this one on my bench for a few years now.

[@xicath]

this one is better than minleaf 3010 with no heatsink more small and lightweight, what do you think?

[@ytrew9717]

which part do you think is the first that could fail ? Do you think it is repairable? Which part isn't repairable?

[@MSU2be]

If you swap out the stock fan with a Noctua NF-A6x25 FLX it will be virtually silent when the fan kicks in.

[@12voltvids]

Not that it matters, it is a bench supply

[@MSU2be]

@@12voltvids I have other bench supplies, but these I use to replace wall warts in my studio. One of these will replace 10 wall warts.

[@markmarkofkane8167]

I am behind the times. I didn't know there was AM stereo. Never had a receiver that received stereo in AM . I do remember awhile back Radio Shack coming out with an AM stereo receiver.

[@driversteve9345]

How is your power supply holding up? I just got this exact one in the mail today from Amazon for $49! The digital readout is a little off though but not by much.

[@12voltvids]

Working fine. Use it all the time.

[@packratswhatif.3990]

Yeah you still gotta love the old analog supplies…….. but not their prices.

[@12voltvids]

I had a nice adjustable linear supply and i got hoodwinked out of it by a friend.

[@Jesus_paid_it_all]

Hello, I have a small question on this instrument, and that is, do you need to use "banana" clamps? Can you just use typical "alligator" clamps?

[@12voltvids]

You can use anything you want. You can use bare wire if that turns your crank. The binding posts will accept banana plugs and regular wire as well as spade connectors.

[@Jesus_paid_it_all]

@@12voltvids Thank you!

[@stevejosrph6065]

Thank you good review ... Guess this power supply has no voltage overload protection

[@jasonthejawman5442]

Wow very cool

[@surinderdhiman]

Sir, I have a same bench power supply with no output. I am new to electronics. Could you please guide me through that from where to start checking to find the fault of the same?

[@sncat]

Good power supply! It can display the values of cellular units. (0.01A ). Has voltage and current accuracy adjustment, are on the back of the display. Good product.

[@12voltvids]

I was waiting for someone to comment on the manual. The part about "maintain" on the last page. Remember this is a "High Pressure" machine. Do not repair yourself.!

[@jeffescortlx]

Gotta love engrish equipment. It's a little like playing the lotter, but with slightly better odds.

[@12voltvids]

You mean "praying the lotter" right

[@jeffescortlx]

Well really ment playing the lottery. Auto correct got me. My odd's of winning is better than going to the casino. Random Chinese electronics from eBay and Banggood is my casino.

[@12voltvids]

Never had any issues with any of the products sent to me from either banggood or icstation. Every one has performed as expected. I have had problems from other vendors, including the one I am on hold with fed ex now, as they decided to send me a bill for 20.32 to broker a sample that was valued at 0 dollars. Because some idiot sent it fed ex instead of USPS.

[@jeffescortlx]

I would say 90% of the time the direct from China stuff works out for me. I've had the most issues with LED's set up for automotive sockets. They will start flickering after a couple of months. Also had one scan tool I had to send back, buggy and touch screen was unusable. But thinks like wire strippers, some soldering equipment, signal generator, power buck boards all work well for the low price.

[@two3fpv]

Hey bud can you tell me if the fan on yours stays on all the time? Mine kicks on for a quick sec when powered on and then nothing. I've yet to use it for anything yet so I haven't seen if it does this under load for any length of time, just wondering. Also, I want to say that when I received my own it did not work. Upon inspection of it's internal parts I discovered that two major components had broken solder joints from shipping (i assume). Basically all the soldering was on point, but as I said there were two breaks. Soldered them up and it seems to work fine.

[@12voltvids]

The fan cycles on and off when under low load.

[@jhonnyginting8985]

You should modified it...the mosfet need a couple of little iron toroids on their legs..that should be improved a bit

[@mac_uk5464]

It's now 1 3/4 years since your review, how is the power supply holding up. Has it survived your torture?. I ask because I'm thinking of buying one, would you still recommend or have you since had other thoughts?.

[@12voltvids]

Yes it is still working,, sitting on my bench next to my scope. I use it all the time.

[@mac_uk5464]

@@12voltvids So you'd recommend it then?. Could you swop out the current pot for a multi-turn pot (Warranty voided obviously)?.

[@12voltvids]

@@mac_uk5464 Yes I would. And it does have a multi turn (5 turn end to end) for the voltage. The current limit is a single turn.

[@mradaChris]

I bought one and I never see the amperage show a value when I have a load on the circuit. Maybe what I am testing is too low an amperage (24 VDC 0.08 A). I was thinking mine was broken but maybe I need to test say an LED strip. Also what is the purpose of the ground port?

[@12voltvids]

The ground lug is chassis ground which is connected to earth. The 2 output posts are not referenced to the chassis ground.

[@artursmihelsons415]

It's only 2 power transformers inside in this bench power supply.. not 3.. that midle small transformer is for driving big transistors.. ;) As it is in the computer ATX supply's.. But anyway, great review video.. :) For AM radio tests, try to put in bench power supply DC output line big external electrolitic capacitor.. 4700-10000uF 50V-63V will be great for noise reduction.. Capacitor is connected before power on power supply.. But warning, this may affect current limit etc.. that's mean, that capacitor is attached only when test radio is known as working (power and amp part) and there is need to test out tuner sensitivity etc.. ;)

[@12voltvids]

A big cap is going to appear as a dead short on power up and likely put the unit into over current shut down.

[@artursmihelsons415]

@@12voltvids Hmm.. Maybe.. Depends on how supply is reacting when it's turned on.. If outputs is connected in that stage, then capacitor charges up.. if not connected and connects later, then is possibility, that cap may show as short.. Anyway, soft start circuit is very simple and it's no difficult to build as external module.. :) I just forgot, that my bench supply holds modiefied AT supply internals and that's why integrated big cap works excellent.. And yes, back in day's, if i connected that cap, when supply was running, it goes in over current protection mode.. that's why cap was leaved always connected inside multifunction laboratory supply case.. And extra thing is, that i can easy run car cigarette lighter, car compressor etc.. heavy load from it.. and no noise or spikes on power rails.. Without that big cap, it can't run big inductive loads.. but 12V rail, for that AT supply, was originally rated for 10A..

[@keithking1985]

would you recommend it coz iv had my eye on it since I started learning a year ago, but kind a wanted to build my own too just because I can!!! I mean I like what I see inside, and have seen a few reviews and teardowns!! I can get it for around 43 euros with free shipping from china with maybe a couple of bucks insurance.. but might even be able to get it for less with bang good points and shit. but still not made my mind up on the thing!! just don't know.... I m also not sure weather to get a 10 or 5 amp one.. it would be my first power supply too!! was just using batteries LM317's and 12 volt barrel jack type supply's the common ones used for loads of stuff. so what would you recommend??? coz im stumped when it comes to my first proper supply..

[@12voltvids]

Go for the 10 amp. You will be glad you did. This one has been flawless in the year or so I have owned it.

[@keithking1985]

thank you 12voltvids. I think I should get it coz like I was saying I can get it dirt cheap! but am still going to build my own too.. for the joy of doing it mostly more than the need for one. i get lazy ya see but have made a promise to myself to snap out of it and start putting what iv learned to use!! this stuff just came so naturally to me!! cant believe i didn't attempt learning when i was a kid but was told you need to be good at math's which put me off all my life coz my math's was worse than a 7 year old kid for years until i saw a video by a guy called rimstar.org last year explaining how a joule thief worked and it just completely blew my mind and i knew instantly that i understood this stuff and it was what i should have being doing all my life.. and maths has become one of my strongest subjects since learning. but thank you for helping make my mind up and love your videos : )

[@djaurich01]

GREETINGS 12voltvids I HAVE E BSE SAME POWER SUPPLY AND I DO NOT ELEVATE THE VOLTAGE I WOULD LIKE TO KNOW WHAT CAN BE THAT. IT ALREADY PROVES THE POTENTIOMETER AND IT IS GOOD BUT I HAVE SEARCHED FOR IT AND WANTED AND I DO NOT FIND THE FAILURE I WOULD LIKE TO HELP ME TO PUT IT INTO OPERATION. PLEASE. THANK YOU

[@DenisPrat-sl6qz]

After light use mine doesn't power on after 3 months

[@12voltvids]

6 years in mine works perfectly

[@yhan_saintsantiago554]

Good day sir, i have same model, do you know what could be the problem? It only reach upto 8.9v? I tried to replaced the multi turn pot but same issue. It wont turn upto 30volts

[@procommel]

ho capito perché regola male, il prodotto più vecchio che aveva i led CV e CA a sinistra delle manopole regolava bene da 0 a 30V, quello nuovo con i led a sinistra dei display regola da 5-8 a 30V, hanno peggiorato il prodotto.

[@robertzeman4301]

Does anyone know what is the Choke Inductor (L6) on the bottom? It has no info only number "3" on the left and "HY" on the right. Thank you very much for any help. My power supply immediately blow when I plug it in even while it was turn off and the input AC was set right.

[@keithking1985]

that sounds like you got a dud supply, I mean it shouldn't of blown the moment you plugged it in. I would demand a replacement unit. as for the choke iv no idea but im sure someone with more knowledge than me will answer that for you.. Id say you were sickened when it happened?? I know I would have been.. honestly I feel sorry for ya and hope you can get it replaced at no extra cost...

[@ivansalinaro]

Hi! not even the Vs work for me how do I do it? thanks!

[@alexispieltin9379]

You are ready for electric welding!

[@JoshKilen]

very nice power supply, what is the max amps you can draw at 13.8 volts?

[@12voltvids]

10 Amps.

[@JoshKilen]

@@12voltvids so the reason why it drops to a very low voltage when you short the leads, that is part of the sort circuit protection? the reason why I asked is because I was under the assumption that the more voltage you pull, the less amps you can draw, or am I thinking of a linear power supply setup? so you can actually pull 10amps at 30 Volts with this type of supply?

[@12voltvids]

@@JoshKilen When you short the leads it goes into current set mode so you can set the max current. It puts out full 10 amps from less than 1 volt to 30 volts. Throw a load that can soak that current and you will see.

[@bunasir394]

Hi can you charge lead acid battery with this power supply Also can you run Ac motor with this power supply

[@5084204]

You can charge the battery, however, I would use the diode for safety and made a note/time checks to prevent overcharging...

[@victorcoss2600]

Isn't that type of antenna for FM not AM? Thought AM used a loop antenna.

[@jimreardon6599]

Anything will work for AM radio. Loop was designed just to make it small and fit in the cabinet.

[@federox86]

thx

[@berwynrogers1450]

Is there anyway to suppress that noise on the first supply ?

[@12voltvids]

Some SMPS radiate more noise than others. Shielding is part of it, but good chokes on the AC power line, and output leads should help.

[@techie587]

Bro... I brought one same.... But the fan initialises and gets off.... Is it OK.... Or should spin Continuosly after switch on.... Plz help

[@12voltvids]

Fan cycles on and off at low power settings. Under high current it will run longer. It is temperature controlled.

[@techie587]

@@12voltvids thnk you my brother... I was stunned and anticipated it to be like an smps fan....breath back.... 😂😂😂

[@SuperSayiyajin]

I need maximum 20V 7A...Can i take this values from this power supply?

[@BH4x0r]

yes, you can just put it on 20v and in short circuit limit the current to 7A

[@David-cy5zu]

Burak İbrahim Ünal you look like Julian from Trailer Park Boys

[@brainwashed7244]

theres absolutely no way they could have beefed it up for the "review"

[@davidgriffin79]

Interesting; and in the UK the 10A power supp;y is cheaper.

[@PhaQ2]

Woohoo!! More content is good content. Who says quantity doesn't mean quality? Well they're wrong!

[@12voltvids]

I have been working on these all week. I just edited and posted today as I had a day off.

[@FalcoGer]

surely you have an oscilloscope so you don't need to use your car radio for testing :P

[@12voltvids]

What will an oscilloscope tell me as far as how much RFI it is throwing out. I was using the car radio because many cheap switching power supplies throw out much hash that is picked up by sensitive car radios. If you heard the other power supply you would understand. It isn't ripple on the DC that is causing the noise. On the scope it will be perfectly clean. It is noise from the chopped side of the circuit where bursts of noise radiate all over the band. A spectrum analyzer would show this.

[@pleasecho2]

Is the buzzing the lamp or the PWM?

[@12voltvids]

All kinds of things make noise in my shop. Fluorescent lamps, the monitor ect. Even this power supply makes noise, the internal fan that ramps up and down in speed depending on how much load is put on it.

[@pleasecho2]

@@12voltvids Thanks. Just wondering how much noise this one makes. Seems acceptable for something in this price range

[@12voltvids]

@@pleasecho2 It doesn't make any until the fan ramps up. When under low load the fan runs very slow.

[@pleasecho2]

@@12voltvids It doesn't sound like a serious issue but I suppose other cooling solutions might work if it were really important.

[@oscarrodriguez-mk9lz]

Hi, Can this power supply be used to detect shorts on a motherboard?

[@12voltvids]

You can limit the current, so if something draws more than the limit, it prevent overload and turn on a light to show that the limit has been reached.

[@oscarrodriguez-mk9lz]

Thanks for the reply, I have already ordered one of these power supplies.

[@12voltvids]

It's a good one. I haven't managed to blow it up yet, like I did with the other one.

[@oscarrodriguez-mk9lz]

ok that is good

[@SBMTeamRajasthan]

Its shortkillr work in use

[@12voltvids]

Haven't killed it yet.

[@brainndamage]

The isolation unfortunately doesn't look that good. If you look past the isolation slots, you can see tracks from the secondary and primary within 2-3mm of each other (on the back of the board, it's hard to see what's going on at the top side). So the isolation is bad to marginal at best.

[@12voltvids]

Jernej Jakob Those traces are the feedback which runs to the optocoupler. They are not running in a High current area. The areas of high current where the DC secondary side is in proximity to the hot primary side is totally separate and isolated. Go back and take a close look.

[@brainndamage]

12voltvids I am taking a close look and I see two places (bottom left & top right) where the isolation slots end that have primary & secondary side traces coming close together. It doesn't matter if they're high or low current. F.e. the top right has one rail coming from the primay rectifier to the switching transistor leg, right next to a small trace that goes off far into the secondary circuitry. It's not horrible, but not up to regulations either.

[@hectorpascal]

I would hazard guess that the Chinese regulations on electromagnetic compatibility are either non-existent or very lax!

[@12voltvids]

Chinese stuff is not that bad. Just where do you think your high end cell phones are made.

[@thijs-p9185]

my current button does nothing please help : (

[@12voltvids]

You short the leads and then you can adjust the max current

[@hambaberdosa6474]

How my be 36v

[@12voltvids]

Buy a model that goes 0 - 60 volts.

[@vc8885]

Questi alimentatori cinesi switch fanno paura dal punto di vista della sicurezza elettrica a quello dei disturbi.

[@12voltvids]

How is that? They are isolated and earthed.

[@umajunkcollector]

niiiice Russian power, with lots jammin' comrad

[@DenisPrat-sl6qz]

No faith in this review, powering a radio? Thiught you were going to try and blow it up. Mine just like this one went out after just three months of light use . When a company sends you a product you're more inclined to say good things about it. Can't test it for 10 minutes and say it's good. Use it for two or three months and then make a review

[@12voltvids]

Well it's still on my bench, I use it almost every day and it has been overloaded more times than I can remember and it's still going strong after 6 years. Who's the fool now.

[@geoffgeoff143]

It looks like junk but I guess it was cheap

[@user-th7gd7ge4p]

maybe you should get your kidneys checked. your swollen hands might indicate potential issues, diabetes perhaps

[@stephenoshaughnessy2279]

Total waste of time trying to blow-it up. Why not take it outside, douse it with lighter fluid, and throw a match. Juvenile.

[@12voltvids]

I have managed to blow up other ones doing stress tests. This one hasn't failed.