Learn how to repair Switching Mode Power Supplies. Analyse and understand the different circuit concepts to efficiently repair SMPS's.
Пікірлер: 215
@GerardSheridan Жыл бұрын
Super detailed and very educational. I was trained as an EE many years ago but have not practiced as one for over 20 years but I’m jumping back in now as a hobby and it’s great to get a refresher on basic principles like you offer here. Keep up the except work!
@johnc44143 жыл бұрын
Hi Peter. So glad that you are back making electronic education and repair videos. I really appreciate that you started at the mains and went through as much checking as possible without removing the board from the chassis. Also really like that you showed us the different types of switching power supplies and how they work. I know that you could have just checked some different test points and located the faulty regulator, but that would not of helped all of us that had no knowledge of how switching power supplies worked. Thank you again. John C
@TRXLab3 жыл бұрын
Thanks for feed back glad that you like it..
@donnieashfield7540 Жыл бұрын
9th
@warisch183 Жыл бұрын
Po P9PPP9o0ppppp99 op op op op op op op op op po0po PPP9lpppppp9 op p oo op pppp0
@warisch183 Жыл бұрын
Po oo o oo oo oo pppp0pppoo pop p
@warisch183 Жыл бұрын
PP0 oo p oo oo op op oppppo po ppooopo
@roseelectronics45823 жыл бұрын
Peter is back with a gold mine! The tech who goes inside the heart of smps circuits. Show them electrons moving around. By the way, you got one of the best handheld multimeters on your bench. At the top on the same level as the Flukes.
@TRXLab3 жыл бұрын
LOL Thank you very kind glad that you like it! Yes the DMM it top notch and I would always prefer it over the Flkue
@VijayKrupakerMaddu Жыл бұрын
@@TRXLab 9
@NX_ICONIC_ Жыл бұрын
077
@regularuser4923 жыл бұрын
Great to see you Peter back in bussines.Full of energy and plenty experience its a real pleasure to follow you're work ! Bleib Gesund und Danke Dir !
@TRXLab3 жыл бұрын
Thank you
@w.rustylane5650 Жыл бұрын
Linear power supplies are my specialty when I was a tech. I'm 72 now and just cannot see as well as when I was younger. I understand linear supplies better than switching supplies. I have found that failing diodes are the most common failure in linear supplies. Of course I only have 120 volts AC to deal with here in the US. Very seldom do you have to replace a failed capacitor. I've also seen burnt resistors in the circuits. You can make most repairs with a good multi-meter. W Rusty Lane K9POW in eastern Tennessee
@towerman75 Жыл бұрын
I ran a Motorola Communications Business for 26 years, and watching you work with all the high tech equipment, makes me think of the thousands of dollars I could have made if I had excess to such at the time.
@TRXLab Жыл бұрын
well yes agreed, good analysis capability helps to organize your workflow in order to get things faster and more professional done...
@claudio64933 жыл бұрын
Great! Id like to see you repair Professional military hf receivers like Hagenuk, R&S, Racal etc! I'm very happy that you come back again here ! Danke! Ciao ! 73
@TRXLab3 жыл бұрын
Thank you. I'm not working in the field of professional hf devices..,so that will most likely not happen..
@lyntonprescott3412 Жыл бұрын
Brilliant diagnostic work! I have a SMPS that operates my disabled wifes reclining chair that she sits and sleeps in. The original PSU failed recently failed so I bought her a cheap Chinese replacement replacement but I would like to repair the original unit. You have given me many avenues to try and fix it. Many thanks Lynton G4XCQ
@TonyBarr993 жыл бұрын
Thank you TRX! This was a beautiful video, rich with helpful content and tips, not only on fixing this SMPS, but so much more, so well explained. Congratulations on a video well done!
@TRXLab3 жыл бұрын
Thanks for feed back
@80Loke3 жыл бұрын
Im so impressed by your knowledge and all nice equipment you got Peter 👍🙂
@TRXLab3 жыл бұрын
Thank you just go ahead with your training and you will gain your level of knowledge which will than easily outshine what I'm doing...
@CliveTrezona3 жыл бұрын
This was a great series on smps. Thanks very much for this.
@TRXLab3 жыл бұрын
Thank you
@BobMellor19543 жыл бұрын
Hi Peter, thank you for the video; they never fail to increase my knowledge. 73's
@TRXLab3 жыл бұрын
Thanks Bob!
@OleF1123 жыл бұрын
Finally a good working SMPS. Fine climax of a good video series, it was a pleasure. Well done, Peter. Bleib weiterhin gesund! 73 de Olaf
@TRXLab3 жыл бұрын
Thank you Olaf and bleib ebenfalls weiterhin gesund....
@w.rustylane5650 Жыл бұрын
It's weird. KZbin won't let me edit my posts. It keeps returning an error. What's up KZbin??? The full wave bridge rectifiers (diodes) usually go first. You are starting at the right spot. Incoming voltages have to be correct, diodes must be okay, then voltage regulators must be checked. I don't think I've ever seen a power transformer burned out. It's usually some little pesky resistor burned up. I worked on an old RCA TV set my father-in-law gave me. It was a nice TV at the time--back in the mid 70's. He tried to get it fixed locally and no one could fix it. So he gave it to me. I first plugged it in and gave it a smoke test and sure enough there was a resistor in the audio circuit that was smoking. I didn't have a schematic for it so I just guessed at the resistor value and inserted a 1K ohm resistor and the TV came back to life. Another problem developed. We had wooden floors and when you walked across the floor near the TV it would flash on and off. So I pulled the board with the with the IF section containing the video amp and found a solder ball rolling around shorting out the video transistor. Dumped out the solder ball and we used that TV for over 25 years. It finally developed a high voltage leak, so I sealed it up with some silicone. Finally it developed a high voltage leak that I couldn't fix. It got junked then. W Rusty Lane K9POW in eastern Tennessee
@johntyson89323 жыл бұрын
This series was extremely informative. Thank you.
@TRXLab3 жыл бұрын
Thanks for comment and watching...
@BoB4jjjjs3 жыл бұрын
Very good and very well explained sir. You went above and beyond what you needed to to explain what you were doing during the repair. Thank-you. :-))
@TRXLab3 жыл бұрын
Thanks for feed back
@chillax141 Жыл бұрын
Amazing video. Videos like these are helping me to learn how electronics work and slowly build up my knowledge. Very enjoyable 👌
@ElmoSyr Жыл бұрын
Thanks a bunch for this! Such a broad view and lots of information condensed in this video!
@PapasDino3 жыл бұрын
Thanks Peter, I know so much more now about SMPS inner workings. Stay safe! 73 - Dino KLØS
@TRXLab3 жыл бұрын
Thanks Dino, glad that you like it! 73
@Daveyk0213 жыл бұрын
Well done! At times a little over-explained for my tastes, but necessary for a good teacher. I enjoy your voice and your accent. You voice reminds me of training engineers years ago from Krautkramer back when we would get training on a new instrument.
@TRXLab3 жыл бұрын
Thank you. It is always difficult to find the right amount of explaining since the knowledge level of the viewers is so different.
@Daveyk0213 жыл бұрын
@@TRXLab I think you need to keep doing it the way you are. I find you are very thorough. I get frustrated also when videos are too short - lol. I would rather have them long.
@fredfabris71873 жыл бұрын
Please don’t change a thing!😜 That’s what fast forward is for :-) I usually find myself rewinding over and over 🤣
@rscelectrical70913 жыл бұрын
Finally I found time to watch this 🙂, totally agree with you: SMPS can seriously destroy your day if you don't treat them with respect. Love the Polo shirt buddy, it's a great colour.
@TRXLab3 жыл бұрын
lol yeah right colour haha. Thanks for watching
@lupojacobo98923 жыл бұрын
This channel its funny, even for those who are not either Technician or Engineers 😎
@TRXLab3 жыл бұрын
lol
@davidwalle50253 жыл бұрын
another great video. Going to use some of your techniques on the jetstream power supply i am working. It is looking like the problem is in the controller board. When I get some more time I will work on it. Keeping the videos coming.
@TRXLab3 жыл бұрын
Thanks and good luck with your power supply!
@wa2mo3 жыл бұрын
Thanks for a very informative and educational video series I really learned something.
@TRXLab3 жыл бұрын
Thank you!
@jaynone92623 жыл бұрын
"That was a sentence, 0 my gosh".. Great work with added humor. Made me laugh and learn at the same time. 73s
@TRXLab3 жыл бұрын
Thank you glad that you like it.
@klydolph23 жыл бұрын
I love videos like this. Would also to be great to see some video about theory/troubleshooting active PFC circuit. Many thanks and best wishes.
@TRXLab3 жыл бұрын
Thank you. As already stated in an earlier answer here I will put it on the project list.
@worroSfOretsevraH3 жыл бұрын
@@TRXLab A good start would be modern TV power supplies. They all have an active PFC circuit, and they often fail!
@AntoNio-nw7kx3 жыл бұрын
Great explanation! I somethimes fix SMPS powe rsuply, but my experience on that isn't good as your. I was rarely lucky like that, there was in most of cases, Mosfet blown up, and also the IC oscillator ( or its circuit) with troubles. Somethimes there was also issues on feedback control circuits. Often, of course Capacitors... specially those ones in the secondary side that are specific for hig frequency switching, with low ESR that, if too much aged, cannot do their Job as well. I love the way as you explain all the job! it is a good way to teach, theory adding practical measuremet and how to do measurements in safe and right way. I saw also a usefull instrument to make safe the measurements with oscilloscope (Micsig DP10013), in future i will buy one same as your. You have plenty of nice instruments... that Sencore LC77 is really amazing. Thank you for all the explanations... i will follow you to learn more. I would also contact you if possible to ask you something about your R&S CMT 54 .
@TRXLab3 жыл бұрын
Thanks for your feed back very much appreciated
@nanko552 жыл бұрын
Hi Peter, just watched and enjoyed this video again. Thanks for the warning not to use a valuable and precious scope for circuit measurements! To prevent scope damage, I use a 500VA isolation transformer, that works fine and prevent main voltage hazardous situations. Thanks a lot for all your great videos! 73’s, Nanko, PA0NVY
@JohnUsp2 жыл бұрын
Don't use an isolation transformer in the scope. Use it on the Device Under Test. He used a Differential Probe on the scope, the best approach.
@nanko552 жыл бұрын
@@JohnUsp hi John, Thanks. You are right, the isolation transformer is used for the device under test, not to power the scope, I was not clear in my response. 73, Nanko
@fredflintstone80483 жыл бұрын
Great video. I like the way you took us through your systematic troubleshooting method. I don't know if you noticed this or not, but it seemed like the ground pin (center pin?) on the voltage regulator had what appears in the video the first time that you showed it from underneath, a cracked solder joint all the way around. If my eyes are working properly that could have very well been the cause of the regulator not passing any voltage. If you noticed it and reflowed the solder then of course the replacement was necessary. Again, great video. thanks for sharing.
@TRXLab3 жыл бұрын
Thanks for feed back!
@Joe_HamRadioGuy3 жыл бұрын
Nice job love your explainations to detail. Seems like that power supply has been around the block a few times but still kicking. We know that camera gets in your way if you could mount it over head pointing down at what your working on I'm pretty sure it won't be in your way. Thanks for all you do to bring us some more great videos 73
@TRXLab3 жыл бұрын
Thanks for stepping by!
@MrKelendros3 жыл бұрын
Nice video peter. Really thx very much for the effort and time dedicated yo show us the troubleshooting process. See you in he next one :)
@TRXLab3 жыл бұрын
Thank you
@fredfabris71873 жыл бұрын
Fantastic video. Please keep up the circuit analysis diagnosis explanation type video with schematics. You’re a really great teacher, it’s obvious that you put a lot of effort into this. Thank you very much.
@TRXLab3 жыл бұрын
Thanks for feed back
@vincepirozzi96033 жыл бұрын
Very nicely done. Really explains how this type of power supply works.
@TRXLab3 жыл бұрын
Thank you!
@bblod48963 жыл бұрын
Nice repair. Guess it wasn't too difficult to remove the main board. The controller board might have been more difficult to diagnose due to its position. Blue Ringer kit ordered, thanks for the tip. Take care Peter.
@TRXLab3 жыл бұрын
Thank you. Right it was not to difficult to remove the board. As I already said before if you need to work at the controller board swap simply out the critical components as you can't take the pcb out twice...
@joaquinaguirre29763 жыл бұрын
One of the best!!!!!! Thank you Mr. TRX.
@forogonya-howcometoyou57272 жыл бұрын
I do not know how I missed this tutorial. Out in January for me to only come across it in September. This tutorial is fucken too good, hammering the points home practically as well as theoratically. I wish you can do one on VFD's. Thank you very much.
@frankreiserm.s.80392 жыл бұрын
Great video. You have all the fancy toys.
@andredevilliers03 жыл бұрын
Good day Sir Thank you very much for the informative video. I always understood that using an isolation transformer between the mains and the device under test, causes its output to not be mains earth referenced anymore(floating) and thus allows you to connect earthed equipment, like an oscilloscope, to any part of the power supply without fear of damage. So when you do connect the ground crocodile clip of the standard probe, which is connected to mains earth, to any point in the circuit, that point then becomes earth referenced. I do agree that a differential probe is the safest. Pity it is so expensive.
@juanabreu51273 жыл бұрын
Good Lord, whawt a nice explanation. Thanks Peter.
@TRXLab3 жыл бұрын
Thank you!
@billnicholson24703 жыл бұрын
Lots of great information. Thanks Peter.
@TRXLab3 жыл бұрын
Thanks
@saarike3 жыл бұрын
Really excellent! Thank you TRX Lab. 👍
@TRXLab3 жыл бұрын
Thank you
@winstonbeckford7853 жыл бұрын
Man you have got some test equipment in there👍👍👍
@daveys3 жыл бұрын
I connected my oscilloscope directly to the mains. Even though it was a battery one it made a right old mess of the innards. The thing made a noise like 1000 components crying out in pain.
@TRXLab3 жыл бұрын
shit happens lol
@daveys3 жыл бұрын
@@TRXLab That’s pretty much what I said. “Shit”. I just knew that it was going to be costly from the noise it made. New main board. £500.
@ericleroux98733 жыл бұрын
hi Peter. about reactive power, in france, authorities are actually changing our old power counter by a new model witch is a communicative counter call LINKY. but the new one is in VA... so most part of the french people (99.9%) don't know what it is about. so for some of them a big suprise are waittig them on their bill. As well as the subscription is generally for 6 kw, they will have in reallity less active power available. further more this counter is equiped with a built in cut off so if you exceed the power subscription it cut the line automaticly....big brother is in our house....creepy!!!!!
@TRXLab3 жыл бұрын
Wow that can get very expensive..The only way is to get around to start reactive power compensation. May be that is the reason that if people start to complain they get the advice to call the electrician?? Good trick by the power companies??
@wegi96212 жыл бұрын
Very nice video. Professional work. For me missing the scope signal from both mosfet gate keys bcos I wonder over this trick: How it work and what for is implemented driving upper key mosfet gate via other transformer - so my question is: 1. Both mosfet are switching in this same time or this floating source gate doing any delay between up and down key? 2. What here is domination wind - from gate side or high side of transformer? Simply culd you explain how it work an why its implemented? btw. first time I saw forward 2t with two main cappacitors in series. Even for me I can put 2 caps on 400V for less stress this units. Also less current leaks when use 50% nominal voltage of cappacitors.
@Bass.Player3 жыл бұрын
Good series here Peter. Though not seen here but I have owned switching supplies that are non-isolated that use an inductor instead of a transformer. A voltage sniffer would come in handy or this diagnosis...
@TRXLab3 жыл бұрын
Thank you. You are talking about DC-DC converter which are working with one inductor only?
@Bass.Player3 жыл бұрын
@@TRXLab No it was A/C to D/C, what I remember about it was that it used an X-Rated Capacitor and a zener in the circuit, I have seen them with both a full and half wave rectifier. It seems like I remember some computer PSU's that were transformer-less? Sorry I don't remember much about them...
@bulla86316 ай бұрын
the most dangerous power supply is a high voltages switch mode power supply it builds with the inverters inside the circuits boards
@michsmi8297 Жыл бұрын
Excellent video, a simple question for you. Is there a way to calculate the minimum input current required for the smps to start up properly please?
@cat-lw6kq3 жыл бұрын
I wonder why manufacturers don't make test points to make it easier to test and repair these units.
@cesaru36193 жыл бұрын
because now they make them disposable 1 year warranty extra cheap for you.
@w.rustylane5650 Жыл бұрын
I still have my old isolation transformer. I sometimes have some line noise and was wondering if the isolation transformer would remove the line noise. I think it may be coming from the refrigerator, just not sure. It could be some vortex over my QTH messing up my VHF frequencies. I've only noticed it on VHF and never HF. What you suggest? W Rusty Lane K9POW in eastern Tennessee
@BijuKumar-kj7qr2 жыл бұрын
Thank you sir . informative video about S.M.P.S repairing.
@TRXLab2 жыл бұрын
Thank you
@davidhollfelder9940 Жыл бұрын
No output from voltage regulator. With power off, did you check that test point for a short to ground?
@zari63 Жыл бұрын
Hello Peter great job please tell me, if I use the diff head. Test probe can really don't need what's called an Auto transformer, to get the flooting point and safety working with scope??
@andyenochs11454 ай бұрын
I see the ring tester is no longer in production. How would I use a standard ESR meter to know if the coil is damaged if I don’t know the value the transformer should have?
@TRXLab4 ай бұрын
Look here it might be helpful to you anatekinstruments.com/collections/anatek-blue-ring-accessories
@Daveyk0213 жыл бұрын
Oh, and you had it too easy with the defective linear regulator. I was hoping for an issue on the control side board - lol.
@TRXLab3 жыл бұрын
LOL yeah I would have liked to had a more difficult one for sure but this is real life :-)
@TKomoski3 жыл бұрын
Hey glad your back *:* *)*
@rduwe94669 күн бұрын
better go right up to the rectifier bridge if no power you go down to the primairy if you do have power you go right to the secondary so you dont waste time
@abednier Жыл бұрын
Great explanation
@nimalperera54543 жыл бұрын
Suppose if you found the fuse was blown, what would you do next? How would you look for the reason for the fuse to be blown?
@gerhardwiesinger3 жыл бұрын
Great. Can you please post your Word Doc with the different kind of converters. Where did you find the schematic? Thnx.
@TRXLab3 жыл бұрын
Thank you. I try but I don't have a platform yet.
@sumarsingkumare5147 Жыл бұрын
@@TRXLab l
@frantech69353 жыл бұрын
Thanks so much for the videos. I normally watch your videos for the entertainment value mostly, however this time is different. I'm re-watching this one actually because the SMPS in my Icom IC-7800 stopped working. I know nothing about them. Icom expects you to replace the entire unit at $1550 USD and will not supply a schematic. I was very fortunate to find someone on the internet who had a copy that was drawn (reverse engineered) by some hams. I have 322V high voltage and I have an ACLV of 63volts. So here is my question, I have a scope that runs off of a battery. I normally keep it plugged in to mains power to keep the battery charged. Would it be safe to unplug the AC cord and run it off of battery power and it be safe to use to probe the power supply? Based on your explanation it would seem so but I don't want to try it and be surprised. I've only ever repaired one SMPS and that was on an IC-736 and all I did was replace all of the electrolytic capacitors. I suspect an old capacitor is the problem in the IC-7800 as well. Thanks for any advice.
@uricohen54633 жыл бұрын
amazing sir , i love the way you explain
@TRXLab3 жыл бұрын
Thank you
@garysetterfield95783 жыл бұрын
great to see you back Peter. been following you for a few years now . could i use the same diagnostic to repair a Yaesu ft 990 internal power supply ( it started BUZZYING then just stop ) keep up the great work, say safe , all the best from the UK
@TRXLab3 жыл бұрын
Thank you. Yes this procedure is valid for any SMPS..
@jashimelectronics Жыл бұрын
good job dear.
@JohnUsp2 жыл бұрын
Awesome class, thank you.
@ernestocircuit9820 күн бұрын
where do you get the schematics for the power supplies???
@modelsnapper3 жыл бұрын
Greetings Peter, what a fantastic channel. Do you run a commercial repair workshop, that will accept repairs? Or is it only repairs for KZbin ? Please do let me know. Many thanks !
@TRXLab3 жыл бұрын
Thanks for feed back!
@bulla8631 Жыл бұрын
how do you workout let’s say a 25k ohms in the inside an amplie when I test them it shows 18k ohms when I remove it from the ampli
@yezok012 жыл бұрын
Nice Multimeter it would look good on my bench ☺
@MGEE1960 Жыл бұрын
Could you do the same for my SMPS? It's from a Crate guitar amp. I fried something when a surge accured at my house. I can send you schematic if you could tell me where to probe at points to find faulty component.
@mhmd25343 жыл бұрын
Nice job, you always inspiring me. But can you please post video for this ringer tester and how to make one?
@TRXLab3 жыл бұрын
Thank you. If possible buy a ringer kit it is not easy to build
@mhmd25343 жыл бұрын
@@TRXLab thank you
@bulla86316 ай бұрын
capacitors it’s smooth outs for an AC that’s converted to DC if a pure DC it’s doesn’t smooth outs what’s part it’s needed to add to causes it smooth outs examples 12volts DC connected to a 25volts capacitor the voltages stayed 12volts the same if using AC power converted to 12volts DC it’s smooth out almost 15volts but a pure DC it won’t works whats parts it needed to added to cause it’s smooth outs
@TRXLab5 ай бұрын
Hm, what are you trying to tell us?
@scossa_vr3 жыл бұрын
Great work! You write "no discussion we need a certified transformer on the DUT unit. 2: You do NOT need a second transformer on your scope but it makes daily business much easier as you do not always think about safety issues while you are working" I ask you: Does connecting the oscilloscope via the isolation transformer require that the ground wire is also connected or can it be left unconnected? Tnks
@TRXLab3 жыл бұрын
No under no circumstances not! Thant would kill the safety!
@scossa_vr3 жыл бұрын
@@TRXLab You mean "leaving the ground wire disconnected would kill security", right? But the risk would only exist if there was a leak between the phase wire and the frame, or am I wrong? Thanks for your attention. PS: I apologize for my bad English.
@TRXLab3 жыл бұрын
@@scossa_vr No don't Connect The Ground Wire
@scossa_vr3 жыл бұрын
@@TRXLab Sorry but I still don't understand, could you kindly quote the correct sentence between these two (we are talking about scope powered by isolation transformer): a) "scope ground wire NOT connected = kill safety!" b) "scope ground wire CONNECTED = kill safety!" Thanks for your patience :-)
@vtorsi6103 жыл бұрын
@@scossa_vr - For safety - Do NOT connect your scope to any building or mains ground. The whole purpose of an Isolation Transformer is to "FLOAT" the scope.
@aripratama3333 жыл бұрын
Hi, could you tell me with my problem. I have smps 65v DC. The coil is whinning and no output. I've tried to check any capacitor but found no problem. Thx
@thelastofthemartians3 жыл бұрын
Nice video Peter. I wonder why the 7812 regulator failed though.
@TRXLab3 жыл бұрын
Thank you. Well that is a question you can't answer very often..
@heinzergrinder19013 жыл бұрын
Great job. But we really an extra video where you will be talking about " power factor corrector " because the new generation of smps has a PFC.
@TRXLab3 жыл бұрын
Thank you. Well it is always a time issue as videos like this are very very time consuming and don't help to fulfill my daily job. But I will put it on my project list...
@mohammedmariff90343 жыл бұрын
really in deep thanks peter 👍
@TRXLab3 жыл бұрын
Thank you
@VADLRO081319852 жыл бұрын
Hi awesome. could you refer a smps book ? I would like to learn more from power supply’s . Thanks.
@gl0sek3 жыл бұрын
Why you connect smps and osciloscope through 2 transformers? Wouldn't just one on smps or the osciloscope isolate the ground? Aside from serious safety issues wouldn't just isolating the ground pin in the osciloscope plug do the same?
@TRXLab3 жыл бұрын
Very easy 1: no discussion we need a certified transformer on the DUT unit. 2: You do NOT need a second transformer on your scope but it makes daily business much easier as you do not always think about safety issues while you are working. That makes it much more convenient not always think about your test setup but on the problem you are facing . 3: no way to "only" disconnect ground at your scope. This really creates an incalculable serious safety risk. So having a second transformer keeps me isolated from ground and this practices works for many decades with me.
@gl0sek3 жыл бұрын
@@TRXLab ok thank you for response
@michsmi82973 жыл бұрын
@@TRXLab Hi there, really good video, and I appreciated the emphasis on safety. I have had to make my own isolation transformer from stuff I have hanging around because from a hobbyist perspective buying this equipment is expensive. I am currently looking at a smps that's very complicated as it's out of an old HP spectrum analyser, and I have had to take care of the health and safety first! But what I dont have is a differential test device for the scope, I bet that's expensive as well, I probably will have to make one!
@raoamarjeet54732 жыл бұрын
Sir can pulse be sent to igbt gate by only transistor (8550 and bc 548b) in smps ( without microcontroller or pwm ic) if yes then how?
@lupojacobo98922 жыл бұрын
Thanks for sharing
@nyambemundopu11682 жыл бұрын
What Make and Model is the ESR Meter that you're using?
@BLAxWOLF-i Жыл бұрын
Hi Peter how much do you charge to repair amps I have 2 heavy hitters
@hotlava22223 ай бұрын
do you have a diy for this ringer tester of yours?
@FaizTech466Ай бұрын
So so much nice
@enriconapolitano43212 жыл бұрын
Thank you TRX!
@TRXLab2 жыл бұрын
Thanks for watching
@lewisnjovu7957 Жыл бұрын
hai sir that solder gun is it possible to tell me how i can get one for my self and what the name of it
@nortenhardenberg15983 жыл бұрын
34:23 Is it possible, that T1 has an extra winding anyway?
@ArifAnsari-zm1sv Жыл бұрын
So super sir thank you.
@gwolf8807 Жыл бұрын
Thanks!
@Ian.Valerio2 жыл бұрын
Nice observation @1:00:00
@spesunica61473 жыл бұрын
Guten tag.Graupner ist gut mark Power Supply?
@vijayakamath80402 жыл бұрын
Sir do you have abb powersupply cp24/20 driver ic number it is blown off pls help me to have that number it is 8 pin ic
@googlem73 жыл бұрын
It would be interesing to see Tom do the technical breakdown in German.
@TRXLab3 жыл бұрын
Who is Tom?
@bulla8631 Жыл бұрын
I know this IC a operation amplied but what’s kind
@ziadfawzi3 жыл бұрын
Thanks a lot.
@1StanTheMan13 жыл бұрын
The center leg of that Regulator wasn’t soldered. I could see the pad and the pin weren’t soldered.
@TRXLab3 жыл бұрын
That has been already discussed earlier here. That is a double sided pcb and the the joint on the top of the pcb was fine....
@1StanTheMan13 жыл бұрын
@@TRXLab Who is gonna read all the previous posts before they make a comment? You don't have to be rude. Regardless. You didn't show testing of the removed Reg, did you? So, both sides of a double sided PCB don't need solder? Got it.
@TRXLab3 жыл бұрын
Really sorry it was not meant rude in any way and of course you need not to read all comments to write yours. Comments are always welcome so again very sorry.. Right a double sided pcb has a through connection which makes good contact if only one side is soldered.
@georgelareese10862 жыл бұрын
26 Y ears is a long time. But made 1 or2 years before that.
@kishanpreston15333 жыл бұрын
How did you got schematic diagram Sir ? Thnks
@japiemoseki18612 жыл бұрын
Sir can u highlight me on how to connect universal power module