Fixing the switching power supply of a power tool charger

[@DumahBrazorf]

It's good to hear someone tell the trick with the screws. It seems obvious but many don't know it.

[@uK8cvPAq]

I didn't until I started watching DiodeGoneWild, now its second nature to me.

[@111chicane]

I only came to say the same! Finally someone to reveal the secret of proper reassembly to the masses! I kept trying for years and nobody ever took me seriously...

[@RandomNoob]

Some screws are also twin threaded with one being bigger than the other so even after locating the original thread if it seems tight rotate another 180 degrees and it will go in easier

[@BillAnt]

A proper "screw"-ing technique is very important to men... ha-ha

[@waltercomunello121]

I thought it was just the right thing to do, by forcing the screws I knew the thread would get damaged.

[@mikeoliver3254]

Thanks for running through your troubleshooting, this was very informative.

[@Conservator.]

Big Clive impersonator or just a big fan?

[@sadhguruinspired8398]

He had given this tip in his previous videos as well,😉

[@rogerd4559]

yes very informativeI just wish he would sell me some of those transformers he is hoarding lol I hate rewinding them on my power supply

[@mikeoliver3254]

Conservator my beard is my own creation. I’ve had it since before I even watched KZbin.

[@Conservator.]

Mike oliver Somehow I should have known. 😉 👍

[@leozendo3500]

Absolutely amazing. Very little people know that the electrolytic capacitor for driver chip fails often and the symptom is that the PSU shuts off at high load or fast increase in load.

[@gordonwelcher9598]

Thank You. This is a really complete description. Even how to put the screws in. So many people rethread the screws and ruin the holes. It is not nice to go around ruining all the holes that you find. You don't want to make it too loose for the next person.

[@JayH7745]

DiodeGoneWild your uploads are awesome! You make "quality videos" that are enjoyable and informative. People who are old or new to electronics can enjoy watching your uploads. I always look forward to your posts. You and BigClive are my very favorite electronic video uploaders!

[@lordzamasu6220]

I have fg.. 08v.8763745f24758ff

[@lordzamasu6220]

8 m f26f48f3. Vff8f. V

[@lordzamasu6220]

No 7th f8457bn8235vff8fv. V888f85

[@lordzamasu6220]

Rn 2... 8.8 for the vvf847588b8ndfdff8nsf6f

[@lordzamasu6220]

V88v0. Vdb8nfdd888580

[@viewer54322]

What an excellent video. The captions helped me alot too; I paused and read each one. Thank you for your time.

[@hullinstruments]

Would really appreciate more troubleshooting videos from you! You are one of the best teachers on KZbin! And it would help a lot of us to see how you approach different types of repairs. Hope you and your beautiful cat and animals are healthy and doing well.

[@littleal350]

In my experience you tend to get dry joints on the heavier components. Something to do with the flow soldering being set up for the smaller components, the biger ones don't get enough heat to solder properly as they conduct the heat away much quicker. Also sometimes the heavier components will cause a track break if the device has been dropped due to their higher weight ( the inertia of the component can crack a track on the pcb, if the device receives a heavy impact )

[@REVERSE_BIAS]

I have learnt more from you than any other channel. Thank you so much. Good tip on the plastic thread at the end of the video. Turn the screwdriver anticlockwise first until you hear the click! I've always done that too!

[@fix1t]

Admitting that you have had it for a very long time, and did not get around to fixing it as you are a terrible device hoarder gets you a big thumbs up and a subscription from me. I know how you feel my friend! Many thanks for the useful video.

[@Phil8sheo]

Damn you are getting better at this! Very educational and quick to the point. I appreciate how you don't linger too long on one particular thing, but also you are sure to explain in great detail and even offer tips that will save me from headaches in the future such as the microfarrad reading on a multimeter doesn't always reveal a faulty cap. Thanks DGW!

[@pirateman1966]

0:27 "I'm a horrible hoarder" !!! Aren't we all?

[@rogerd4559]

those are good people to know! they may have that part you just cant find on Ebay or Amazon to fix that power supply

[@pumpkinking365]

@@rogerd4559 then those dam screws we loose because we up the project to one side lol

[@Jayf78]

PLEASE DO MORE STEP BY STEP DIAGNOSIS REPAIR VIDEOS. These type of videos help me understand the world of electronics more than any other method. Great video but where is your cat? :)

[@beedslolkuntus2070]

Aww even I miss the cat

[@rkshovon]

You always make awesome and informative videos..

[@YoDay]

I'm so happy that I came so early in this video wow only 24 views These 24 viewers are from Patreon which get early access to his videos. I'll also try to become your patron .

[@cemk6097]

Thanks bro for sharing, BTW your accent always makes me smile, carry on...

[@rogerd4559]

I think he is from the land of Tesla. I wonder if Tesla talked like that and it explains his brillient knowledge of electronics. They seem to have the ability to understand electricity very well

[@aleksastojanov4033]

@@rogerd4559 this sounds more like an indian accent.Tesla was born in Serbia and literally no one j know speaks english that way.We have a hard r and sound kind of like russians when speaking english

[@rogerd4559]

@@aleksastojanov4033 I have heard many indian people speak and they do not speak that way either never heard that accent before

[@AlexforTruth]

I accomplished your schematic for ESR meter, and i'ts work pretty well. Very simple and efficient design! Success in activity!

[@markbosch3915]

Hi alex what value diodes did you use for D1 and D2 please thanks

[@AlexforTruth]

@@markbosch3915 I used a type of Russian diode I had lain around . I do not know exactly what kind of diodes are. You should use a germanium or schottky diode.

[@Conservator.]

It’s such a joy being a patreon of this channel. I can recommend it to everybody.

[@MattAspira]

Does anyone else try the captions on his videos? You speak very English very well though, love the videos they're actually a lot more informative than some other electronics channels so I come here to actually get my questions answered I have fixing things on my own. :)

[@loo02]

Where's the cat ?!

[@mrkitty777]

Meow

[@rogerd4559]

the dog chased it away :o(

[@mrkitty777]

😃

[@BillAnt]

His CAT got tangled up with a CAT-5 cable. xD

[@BillAnt]

@Peter B < I'm old school, just upgraded to CAT-5. ;D

[@williama29]

Diode gone wild I have to like your videos and channel and accent it is easy for me listen to

[@goirikdhar4265]

which accent is this?

[@williama29]

@@goirikdhar4265 czechoslovakia

[@goirikdhar4265]

@@williama29 thanks!

[@worroSfOretsevraH]

I suggest you making a video on the internal differences in normal Li-ion batteries, and high C Li-ion batteries used in RC models. Would be very interesting to see the differences. As I can tell, nobody on YT has done it before. Thanks.

[@_BangDroid_]

So much valuable information here, this is why I love the internet. Thanks for your work!

[@jstro-hobbytech]

That's incredible that you built an esr. I'm going to check out the schematic

[@paulf1071]

16:04 For those wondering.... many ESR meters are polarity insensitive (i.e. it doesn't matter which way round you attach the capacitor under test, even electrolytics)

[@westelaudio943]

Meaauring capacitance or ESR is not a problem with reverse polarity, if the measurement voltage is low enough. The cap works in both directions, but reverse voltage for longer periods will deplete the oxide layer which makes up the dielectric isolator in the cap.

[@coloradowilderness3139]

DiodeGoneWild, Your method is best ever .

[@BPantherPink]

Things are too Dodgy in the world today !! Super trouble-shooting Danyk. LOVE YOUR VIDEOS and your talking 👏👏👏👏

[@davidmckendry214]

You are a very intelligent electrician diode gone wild love watching your videos they are so interesting to me.

[@godfather00cz]

nice job! take this, throw-away society :D

[@yagoa]

This is real environmentalism, not that virtue signaling stuff

[@rogerd4559]

I feel it is better to fix old equipment then to buy more junk that is lower quality the newer it becomes

[@cagmito76]

whats a start up resistor ? resists start up surges ?

[@DiodeGoneWild]

It starts up the chip. It provides some current for the chip to begin with, but it's quite lossy to drop the voltage from 325V (rectified mains) to let's say 12V for the chip, so lated the chip gets its power from an auxiliary winding. This resistor powers the chip just at the beginning when the power supply is not yet switching and so the auxiliary winding can't provide the voltage.

[@cagmito76]

@@DiodeGoneWild ah ok thanks a lot , i get it now .

[@michaelfisher9671]

An ESR test capability seems very useful. Based on your homemade ESR tester I assume that making one isn’t expensive or difficult. Why don’t even high end DMM’s have ESR testing capability?

[@waltercomunello121]

Im actually going to build that amazing ESR meter soon. I think it is an amazing and really useful little tool. Also I have a couple of PSUs to fix!!

[@zorankocoski6147]

Did you build it? I did but something is not working well so I wolud like to ask is your ESR working?

[@edisonchackot7627]

Very nice video.....I have a question...that if we can use a multimeter in mv range for esr meter mv meter place?

[@davypeleman3672]

nice work. great to learn troubleshooting on the internet. i really don't like to much books. it's easier to learn seeing someone do the job.

[@vierxz]

I love your videos , I learn a lot from them

[@JoseAlcerreca]

Is there anything in a circuit that connected to a capacitor could result in a false negative with the ESR meter?

[@orange11squares]

another capacitor in parallel.

[@DiodeGoneWild]

A short circuit in the capacitor or in some component in paralel to it would appear as a very low esr and thus a good capacitor. This can be ruled out using a beep test or diode test of your multimeter. It would be also possible to ad a simple indicator of a short circuit to the ESR meter. Just an LED and a resistor going from the battery + to the capacitor + would maybe be enough. But of course, a resistor in parallel to the capacitor would read a false short circuit. This would require a more accurate check using a multimeter anyway, to verify it's a resistor and not a dead short circuit. And of course, if you have more capacitors in parallel, you can't tell if one has a high ESR. But parallel groups of capacitors almost always fail all at once. This is because all of them tend to be the same (poorly made) batch, all of them wear out more or less the same speed , ... or also because when one capacitor has a high ESR, the other capacitor in parallel will carry more current and wear out much faster and it will soon fail as well.

[@vijendrashirodkar9247]

Can u make a video on how u made that esr meter

[@v1ncend]

Need this too

[@PureAudioTones]

That was a very good explanation of how to check a switching power supplies. Thank you.

[@OmarElmasry1]

I will keep saying it every time you upload a video, I LOVE YOUR VIDEOS MAN.

[@BillAnt]

At 10:13 he wrote "As a kid, I actually tried to build a two transistor blinker using diodes as a transistor..." ... funny cuz I did the same when I was a kid too, and to my utter disappointment it didn't work. Course now I know why, but a transistor's base/emitter can be used as a cheesy diode, but two diodes never as a transistor. Remember that kids ;)

[@rogerd4559]

a transistor may also be used as a cheesy zener and a not so cheesy varactor (voltage controlled capacitor)... used to tune radio circuits

[@BillAnt]

@@rogerd4559 < True.

[@manaharlotia7233]

Excellent presentation and demonstration.nice to see very useful video.To the point explanation.

[@AK2I47]

Really professional stuff , I never knew screws and plastic were like that.

[@chinmoytahbildar3278]

Seriously i always learn a lot from your uploads... Thnk u and love from india

[@riloariichoariicho884]

Please provide a link of making your capacitor tester.i really wanted to make it one.thank you. Yes.i got it

[@jpius1017]

Can you make a video on how you make the capacitor tester

[@dronekpl]

You deserve at least 3 thumbs up for this video, could only give you one. Thanks!

[@redstoner2006]

i cant thank you enough for the esr meter

[@jddr.jkindle9708]

"I'm a horrible hoarder" 0:25 - luv it!

[@steveforrester2217]

Great video. Very informative. Thanks

[@kartikrajurkar3708]

how does ESR meter works that you have, What's principal behind it?

[@DiodeGoneWild]

Look here: danyk.cz/esr_en.html

[@97ickis]

Bravo! Thank you for taking the time to make this video. Your Explanation are spot on and most appreciated.

[@fatih3194]

thanks for the video and schematic. how much should micro or milivolt meter value should be for esr meter

[@virus1985sy]

thank you I think the LED driver doesn't have filter, because I have one like this .but I have no internet at home when it plug in

[@KrotowX]

Fixed similar Bosch charger few months ago. Thing was kept in moist place and on turning on nearly all primary side components except transformer and two resistors fried. Replaced and thing works again.

[@Wekon]

Dobré video. Nevěděl jsem, že danyk.cz je tvá stránka, dobrá práce!

[@cit_63]

Né že bych byl netrpělivý ale dostal jsi ode mně vůbec ten univerzální zdroj ?

[@Mido0Rady]

Can you please make a video on your ESR meter, is it a DIY one or what? please tell me more about it, thanks.

[@skyem5250]

This is a great video! Keep up the good work. You just made one mistake: the value of a capacitor is the capacitance, not capacity.

[@DiodeGoneWild]

If the value of the capacitor (in Farads, mF, uF, nF, pF, ...) is called a capacitance, how do you call its apparent resistance in an AC circuit (in ohms)? How does English differentiate those two things? In Czech, for example, "kapacita" is measured in F, mF, uF, nF, pF. Then we have a word "kapacitance" which means the apparent resistance (in ohms) of the capacitor for an AC current of a certain frequency. This thing is useful, for example for calculations of capacitive droppers...

[@skyem5250]

@@DiodeGoneWild This is called capacitive reactance (or simply reactance). Your English is very good, but I'm always willing to help you improve.

[@DiodeGoneWild]

Thanks :). Now I know it, English just can't say this in a single word...

[@skyem5250]

@@DiodeGoneWild Reactance is the word for the apparent resistance of a component other than a resistor when used in an AC circuit. There is capacitive reactance for a capacitor and inductive reactance for an inductor. (Maybe there are other types I don't know about.) That is why it is two words.

[@dictare]

Another great video. You explain things very well and the captions are helpful.

[@DrHouse-zs9eb]

Very interesting video. Was suprised, that the capacitor seems perfecly when only the capacity is measured.

[@hermannschaefer4777]

This is very common and a trap for beginners. If you repair electronics, a good ESR-meter is a must. I normally use a component tester from ELV called KT200. I does a XY-scope-kinda test for type (i.d. for a capacitor you get a circle etc.) and is also includes a simple but good ESR-meter: kzbin.info/www/bejne/h6KvZJmcnMmZfpY A better capacitor tester is eg. the DER EE DE5000 for about 120$.

[@beedslolkuntus2070]

Hermann Schaefer wat?

[@hermannschaefer4777]

wat wat?

[@johnoneill3260]

I seem to have connectivity between cathode and anode and anode and cathode on STTH2003CT can I/should I just change this or are other components likely to have failed. Symptom is charger is not working and both eDS are on permanently

[@emersonmattoz3794]

Can i replace 5 rings resistor for 4 rings resistor on primary side power suplly near to tht pfc input...???

[@pappalazarou3940]

Mr Carlson's Lab, here on KZbin, has an excellent capacitor tester, very clever, recommended

[@zx8401ztv]

Smashing repair :-D I always try hard to lose the screws, especially if they are the security types that annoy me :) Laptop screws do escape allways. I do the same as you do with threads in plastic, rotate the screw anticlockwise untill the click is heard or felt. You commented on screen about using tantalum capacitors, they are the devils arse!!, they go short circuit if you dare to look at them or explode lol, they need to be lost on the floor quickly :).

[@DiodeGoneWild]

I have a set of bits for virtually all possible types of security screws, so they don't annoy me anymore ;). I have never had any problems with tantalum capacitors. They seem more reliable, they don't wear out. I like to use them especially for logic circuits. I prefer them for my digital clocks which run 24/7 and I want them to last for decades.

[@zx8401ztv]

You and your posh set of bits lol. I'm still not sure about the savings made by using switchmode supplys, they always kill there capacitors and cost extra. My mate has a simple 12v psu i made backin 1988, it is linear, it still works fine and he uses it every day, not too efficent but i don't have to repair it. Yet :)

[@SianaGearz]

@@zx8401ztv There is now a string of failures of classic computer linear power supplies made 30 years ago. The 78 series regulator fails because it has been running a bit warm, and if the luck runs out, it fails by shorting the input to output, which it normally shouldn't do, but when you run it long enough, it just might, which is then pretty bad news for everything right behind it. Besides, it's not like you don't need capacitors for those, and they simply won't last forever. Though it does seem that much of the early computer equipment has been equipped with excellent quality capacitors, perhaps capacitors got a lot more compact, and have better characteristics on paper than they did back then, but also got a lot less reliable. Besides, i suppose they are running in a more benign condition in linear PSUs, less high frequency current. Tantalum capacitors no longer explode. kzbin.info/www/bejne/kHLFgHt8jrd5fck

[@zx8401ztv]

Siana Gearz I would say 30 years for a linear supply is fantastic, you won't find many switchmodes lasting that long lol. Ahh the 78 and 79 series, such a handy regulator :-D. Yes they do die but i tend to go overboard with heatsinking, i tend not to beleive the manufacturers specs, if you can't keep a finger on it without discomfort, put a better heatsink on it lol. I'm no designer, but i don't like silicone based devices getting too hot. The old Lm317 is one of my favorites, such a handy device. Sorry about the waffling.

[@djordjepavlovic5870]

Sir, how can one make at home a simple charger swicher on off....at some adjusted voltage?

[@Clancydaenlightened]

Danyk.cz damn so you're the guy who built all of those Tesla coils and hv generators/drivers 😂😂

[@felixcat4346]

I think he was Bogin, he did a lot with PSU for computers, in the past.

[@rogerd4559]

we gotta get him to build overunity machines and work on anti gravity

[@electronic7979]

Useful video 👍

[@mrwmaad]

Hi. @DiodeGoneWild Do you know what is the middle Lind in the charger. And if you can activate the charger ( make it charging ) without the battery or by connecting another battery.

[@StrPtrn]

Very good and informative. Next time, make a teardown of the battery also! I just did on a 2009 Bosch lawnmower battery just like yours - it's a 2p10s battery. I was surprised to see it was built without any balancing from the BMS. No wonder 2 cells were utterly dead! (and have been for years, the battery failed early and has been sitting in a garage for about 8 years)

[@igoshik3241]

The Bosch AL 3640 CV has the specifications 18-36V 4A. Answer me if you know: 1. How does the AL 3640 CV determine the voltage for charging the battery, if it is for example 18V? 2. I want to convert the Li-Ion battery to LiFePO4. It will be possible to work outside in the extreme cold. How do I lower the output charging voltage?

[@beleteshebabaw6785]

10q for ur helpfillvides.i build the esr circuit and it was good.but it was fail to mesure some bad capacitor or is that may be some cap will fail while there esr value is good? or what?

[@rogerd4559]

the best test over any test instrument is replacement

[@alichank]

Can I have more informations about these schottky diodes (D1 & D2)? I mean what type they are, (for example 1N4007 (but this is standard diode I know). I wanna know it's... code? Dunno what it is).

[@makxlent]

I love your videos. Your English so lovely to hear. Keep it up... ..from India

[@CliveChamberlain946]

Nice repair. Happy to see you got a charge out of it... 8-) Will you be modding and rewinding the output torroid in that low cost 240w SMPS? Because with a little more theory on making fixed SMPS into variable, I can revive the thread on EEVblog for a permanent 3-part series in "Electronics primers" area...

[@DiodeGoneWild]

The modifiaction of the 240W power supply is definitely coming ;).

[@barrygreengrass3379]

How do I find your website Diode, please?

[@deadgamer9808]

i have a supply and i am getting ac out from it i check the output diode and it is ok can you give me an idea what could be wrong

[@mrbutcher3930]

I don't have any hope that my question will be answered but anyway. I got one of those cheaper LCR meters, which is capable of measuring ESR. And my question is at wich resistance shall I see a capacitor as broken, sine it only spits out nubmers and I wanted some piece of advice from someone with more experiance.

[@MalagasOnFire]

Thanks a lot , the ESR circuit works very neat

[@danijel124]

Diode I am from slovenia and I have a broken brother 24mm tape printer. Is it possible to send it to you so you do a teardown and try to fix it? Best regards

[@vierxz]

I also have a question Dan, what are the signs of a bad capacitor in a computer??

[@edinfific2576]

Somebody buy this guy a digital ESR meter quickly! 😉

[@alonsozenteno5622]

Gracias mi amigo..excelente trabajo y muy buena clase...un saludo desde Chiapas México

[@uK8cvPAq]

How come they often socket ICs on these sorts of garage/builders tools? I've seen it done in lots of different tools and chargers.

[@rogerd4559]

hmmm I thought the days of IC sockets was long gone

[@johncantrell614]

What brand and model multimeter are you using? I like the small size. Thanks!

[@Miata822]

Another helpful troubleshooting tutorial. I like this type of video.

[@MisterOwlz]

I used to live in Prague, I sure miss it...

[@rogerd4559]

I would like to see a schematic your variable artificial load. I dont see that for sale anywhere

[@meinsda5983]

I know this charger, i have also this an all have the same Problem. The Standby power supply most of the time don't work and have Problems. I think a also Change this Cap and my chargers works again. But do you have a better solding iron ;)

[@matid8453]

please give schematic this esr metter and artificial load

[@v1ncend]

I LOVE YOUR ESR METER

[@chaitanyabhave5255]

Bosch never doghi Can you plz show how to repair this one Bosch GDR 120 LI there is a small power supply inside in the unit under the trigger Bosch GDR 120 LI

[@supersaiyangoku3580]

Nice to see more power supplies

[@mohammadr797]

Hi You have a universal dc-dc converter in your website that you said could offer power up to tenths of watts, Is it possible to improve it to handle almost 1.5kw power as a buck boost with 12v inputs and 0v to 50v outputs dc-dc power supply? I want to use it with server power supplies as a variable high power supply! Thank you

[@mohammadr797]

@DiodeGoneWild please answer this question, it's important to me Thank you again

[@DrHouse-zs9eb]

10 cells and no balancing?! Is that a good design?

[@DryLog420]

It could have a built in BMS with balance leads. Most likely would have one to be honest... Otherwise, you'd be 100% right, and that battery would be *sketchy*

[@simontay4851]

No, dodgy.

[@DiodeGoneWild]

The battery pack probably has some circuitry in it, including a balacning system.

[@markbosch3915]

Hi doidegonewild really enjoy your videos and i want to build a esr meter but cannot find the values of D1 and D2 please tell me what you used thanks.

[@gordonwedman3179]

If you are talking about diodes the only value that is likely to apply in your case is the wattage and for a test meter any low wattage diode should work. Something the size of a quarter watt resistor.

[@mrkrlmykl]

Love this video.. Many lessons learned..

[@usefulelectronics]

Your content is amazing!! I have a question :) how does the charging circuit know that the battery is fully charged ? So it gives an alarming sound when the charging operation is finished

[@DiodeGoneWild]

When the battery reaches it's charging voltage, 41V in this case.

[@BrucesWorldofStuff]

You always make awesome videos, thanks for that! I always learn something...:D At 0:27 hoarding? I like to call that area my used parts section. I grab anything that has a electronic component in it, don't care what it is...lol Driving down the street I'm always on the lookout for stuff. I just picked up a Old CRT monitor setting in a yard for the trash guy on the way to a Doctors appointment....:D I really like you diagnostic ability, that is everything when it comes to fixing anything, a TV, a Car, you have to know how to test stuff. I just learned something today, I don't have to remove a Cap to test it! I'm going to make me that little ESR tester... I have all the stuff I need in my Used Parts Section.... Lol I Always suspect Caps, I work on old CD radios from time to time, the first thing you do is re-cap the radio and get rid of all of those OLD Gray 10v caps that are 25+ years old.... After that you can checkout other issues if any. Solder joints are another issue in the old stuff..Lol Thanks again!

[@zorankocoski6147]

Hello Dan. You really make great tutorials and you have great tools and interesting schematics on your web site. I made the ESR meter from your schematic there but it doesn't work. I double checked the wireing and the components and everything seems to be ok. The 555 IC on pin 3 oscilates at ~35kHz not in range 50-100. The scale goes to allmost full range, and if I put some Capacitor on the place of Cx or make short circuit between Cx clamps the scale moves from 90%of the scale to 75%. Any tips?

[@zorankocoski6147]

Never mind, I fixed it. Thank you

[@andiyladdie3188]

Big UP ! awesome video, all the troubleshooting and repair, very good!