@@LearnElectronicsRepair One small suggestion. It looks like you are from England, Ireland or Australia, you use somewhat different English than Americans. I do understand English perfectly but if u can do something about sound, get another microphone or speak slower and a little bit more clear, I really struggle to understand your words... About transfer of knowledge its clear that you can do it very clearly.
I've watched lots and lots of electronics educational videos, and yours are the most helpful and understandable for me. You do a great job of explaining and demonstrating things. Thank you!
I have been watching you for quite a while and decided to comment today. I think you are a top notch teacher. I quite like the sound you often make with the "Yerr" at the end of sentences and I am sure will be irritating to others LOL. Thank you for sharing all your skills and knowledge.
Thank you so much. Not only did this lesson help me understand inductors, it helped me understand the change in voltage drop. How a voltage before the collector of a transistor can be high then it goes low. Brilliant stuff. Please keep these lessons up. It's Richard Feynman quality of explaining
Hello everyone... well I waste 3 days finding the problem with the external power supply LG Tv (19V). In the primary capacitor, I have only 60ac/dc then it discharged it then going to charge very slowly. I check everything following your entire video library it helped me very much(thank you) At the end of the day i find the problem and it was the inductance close the bridge rectify, I changed and voilá the voltage up 320v ac/dc and the capacitor carged very fast. thank you so much!!
I recently stumbled onto your channel and I am hooked. I am a software developer who caught the bug of solder/de-soldering/troubleshooting/fixing etc from Northridge Fix. Now I binge-watch this channel :)
I just wanna say thank you for doing this, I'm not fluent on English and neither on electronics stuff, but you explain things as easy as possible, so even I can understand those things, but it's a little bit difficult to understand your accent and I use subtitles😅 Thank you a lot
I really appreciate the amount of effort you put into these videos. I grasp things I have never understood in the past. I hope you get a good return from youtube! I will keep commenting etc. to hopefully positively effect the algorithm. Many thanks again.
This is great! Note that if you're always testing with 100khz you can skip the divide by 628000 multiply by 1 million and just multiply by 1.592 (which is around 1 million / 628000). That will take you straight from ohms to uH
Here is an Inductor marking code calculator www.basictables.com/electronics/inductor/inductor-codes In the calulation of L in microhenrys you can simplifiy the calculation further L=R/628,000 x 1,000,000 is the same thing as L=R/0.628 if you want L in microHenrys Enjoy 🙂
Quite interesting. I have that same ESR meter and I´d never had thought about using if for this purpose. The back EMF explanation is also quite good. Before I knew it, now I get it. Thanks, Richard.
These videos are gold, really enjoy them. It's worth mentioning as well that if accuracy matters to some that there are more comprehensive testers for this but can get very pricey, very quickly. Peak Atlas do very good testers at a more competitive price point in the form of a LCR45 that will do 0.0uH to 2H, resolution typically 0.2uH, accuracy typically ±1.5% ±0.6uH and will do auto or manual test frequencies of DC, 1kHz, 15kHz and 200kHz, these retail at £90 plus VAT. Peak atlas do a slightly cheaper LCR40 but with less range. Peak atlas do many other testers like ESR, component testers etc. they seem quite popular among techs, I suppose because of price/performance ratio before going to lab grade expensive stuff. I also own the testers in this video and are good enough for the most part and get you in the ball park but if accuracy is a must, as with everything, more money needs to be spent.
@@LearnElectronicsRepair Yes absolutely, I'm planning on upgrading some of my kit to peak atlas stuff very soon. I understand and like how you pitch these videos for the beginner who maybe doesn't have all the kit or maybe doesn't quite know how far they will get into and doesn't want to drop a load of money on expensive gear, or even if they do get into it, what kit can you get away with. I just wanted to throw it out there about these cheaper testers, which I thought was the only thing left out of the video when it came to the subject of testing. I know you don't need telling Richard, my comment was more for the viewers, so they dont go out rushing to buy kit before knowing the caveats ;)
@@Adrian_Finn You input and suggestions are valued as always 🙂 In the case of repair I think probably it is not necessary to measure the value of an inductor. I can see possibly that it would be useful to do that if you have some salvaged parts and want to know what value they are. Possibly measuring a lower inductance than the rated value could help in finding inductors with shorted turns - if you knew the rated value. Really to test those faults you need a 'ring tester' and anyway mostly you find that sort of fault in Transformers rather than inductors so I didn't mention it in this video. But I do intend to get/build a cheap ring tester and play around with it on another video. I did wonder while making this video if an inductor with a shorted turn would not show a further reduced inductance if you wrapped a second shorted turn around it - I thought maybe it would be a good way to detect shorted turns, but when I experimented with the idea, wrapping a second shorted turn around it just made the inductance go lower again. Nice idea, I thought, but it didn't work. 🙄 Actually I don't think I have ever found a faulty inductor, although it is possible some faults I could not diagnose were down to inductors I guess. I have seen quite a few faulty transformers, and some that had burnt up on the primary winding. Also faulty line output transformers back in the days of CRT TV. Transformers will be another All you need to know topic soon.
@@LearnElectronicsRepair Thanks Richard, I do get worried that my comments seem like a negative criticism, of course I never mean it that way. 🙂 looking forward to the next one.
Great video series about electronic components i first started learning electronics like this, all i can say is that those "cubic" through hole inductors that have a label on them are a pain to remove with a micro soldering iron and a desoldering pump or braid and they get hot to touch i think a desoldering gun is a must to remove them, now i don't even think about messing with them
I did it yesterday morning, I'm in Australia and when I got up I saw a new video posted by Richard. I was sitting in front of the telly eating my breakfast, eyes glued to the tv and my wife said I look like one of the kids watching Saturday morning cartoons!
Great video, Ive just had time to watch it although i did like it when it got posted and watched a wee bit. I dont know if i missed it or if you going to cover it in another lesson. I was looking for the fly back diode used in coils and was expecting to see it. Great video i learned a few things, thank you.
@@LearnElectronicsRepair Amazing! Yes you totally did mention the back emf and the reverse polarity and you even mentioned it can effect the device its powering when it get turned off. It would have been good to have mentioned a common solution for this problem which is of course the fly back diode. Thank you i did learn a ton too.
Love your content ! Really can’t thank you enough for the information you are putting out here for Neanderthals like us .. I would love to see you do a similar video on optocouplers and optoisolators
Thank you. This is what I hoped - just Everything you need to know to fix stuff 🙂 An educational video should be like a woman's skirt - long enough to cover everything but short enough to be interesting 🤣
I see them in usb charging port using SMD, it is used in later version of Chord Mojo DAC mine was melted away marked as FB not sure if it is inductor TDK MPZ2012S601ATD25 Ferrite Bead, 0805 [2012 Metric], 600 ohm, 2 A, MPZ Series
Great content, just a question, I have a motherboard with the toroidal type inductor on the vrm, can I change this type of inductor to the “modern” ones (the cube-shaped shielded inductors)?
There are properties of toroidal inductors that make them superior to other shapes for some applications. They are still very much used in modern designs. I've designed a lot of industrial switchmode power supplies. Every single one has used at least one toroidal inductor.
Thats intersting. I always wonder what's the job of an inductor. But still it isn't clear. A bit more explanation about it in the circuit would be helpful.
ESR testers don't necessarily use a fixed frequency. One method of measuring ESR is to apply a pulse of known current magnitude to the capacitor under test. If the ESR were zero, the voltage across the capacitor would begin to rise linearly from zero. With ESR you will get a step rise in voltage at the start of the pulse equal to the applied current times the ESR. You see this thing very conspicuously in switchmode power power supplies. If your ESR tester works this way, it will probably be useless for measuring inductors (an inductor would force the current to start at zero so you'd get a large voltage step).
Great video! Are you able to assist in fault finding a dead Evga psu. I found an expanded capacitor and replaced but still no joy with it. Any pointers would be great. I’ll happily donate😀
I accidentally broke a tiny inductor that is shaped like a rectangular bench , I don't know if this will make my motherboard not to work . the inductor is so tiny that it would require micro soldering
I didn't notice anything about core materials. They make a HUGE difference not just in inductance as such but the overall properties of real inductors. In switchmode power supply design choice of inductor core material is not a trival task.
why is there a bypass in the water analogy i always thought inductors just had a series resistance and because of that some kind of protection circuitry like a freewheling diode is needed
That is correct in general. Sometimes a permanent magnet separate from but attached to the core is used to "bias" the core material to make the behavior sort of asymmetric. This sort of thing was often found in the circuitry for a television CRT.
Not for a single-winding inductor. If an inductor has multiple windings the directions of the individual windings _relative to each other_ are very important.
In practice many inductors are indeed coils of wire. Coiling allows the magnetic field around a conductor to act not only "locally" on the conductor but also on adjacent turns. In general inductance is proportional to the square of the number of turns. ALL conductors exhibit inductance. Even a tiny surface mount resistor or capacitor has "parasitic" inductance.That inductance, especially in capacitors, can be detrimental in some applications. The copper tracks on a printed circuit board have inductance that can be a big problem in some types of circuitry. Some people do refer to inductors as "coils." "Choke" is another term. It used to be quite common but isn't so much anymore. You'll hear it more in reference to inductors used for filtering applications both at low frequency (e.g. for "smoothing" after the rectifier in a vacuum tube amplifier's power supply) and at high frequency.
![SAFEPLANET - ดาวเคราะห์ [ THE PLANET ]](http://i.ytimg.com/vi/4X1XL3I_k3c/mqdefault.jpg)
The best chanel on TH-cam to learn about electronic repair,
Blows my mind it's not a million subs!
I feel like this channel is going to get much bigger if you keep posting. Such fine information I get here, no empty talk just knowledge.
Thank you. I'm certainly going to keep on posting...
@@LearnElectronicsRepair One small suggestion. It looks like you are from England, Ireland or Australia, you use somewhat different English than Americans. I do understand English perfectly but if u can do something about sound, get another microphone or speak slower and a little bit more clear, I really struggle to understand your words...
About transfer of knowledge its clear that you can do it very clearly.
@@orion310591RS I'm actually from England 😀
I've watched lots and lots of electronics educational videos, and yours are the most helpful and understandable for me. You do a great job of explaining and demonstrating things. Thank you!
I agree 100%, Richard is a great teacher!
@@darrenbird2526 Totally agree
I have been watching you for quite a while and decided to comment today. I think you are a top notch teacher. I quite like the sound you often make with the "Yerr" at the end of sentences and I am sure will be irritating to others LOL. Thank you for sharing all your skills and knowledge.
Brilliant instructor! Refreshing my memory quite effectively.👍
Thank you so much. Not only did this lesson help me understand inductors, it helped me understand the change in voltage drop. How a voltage before the collector of a transistor can be high then it goes low. Brilliant stuff. Please keep these lessons up. It's Richard Feynman quality of explaining
It's even helped me better understand kinetic Vs potential energy
Hello everyone... well I waste 3 days finding the problem with the external power supply LG Tv (19V). In the primary capacitor, I have only 60ac/dc then it discharged it then going to charge very slowly. I check everything following your entire video library it helped me very much(thank you) At the end of the day i find the problem and it was the inductance close the bridge rectify, I changed and voilá the voltage up 320v ac/dc and the capacitor carged very fast. thank you so much!!
I recently stumbled onto your channel and I am hooked. I am a software developer who caught the bug of solder/de-soldering/troubleshooting/fixing etc from Northridge Fix. Now I binge-watch this channel :)
I see inductors used for baluns and ununs in HAM radio antennas. This was a good start for an understanding moving forward. Thank you.
Thank you so much for sharing your knowledge!
Thank you, thank you, thank you! Getting my knowledge back fast, and then some... Keep it up. I keep coming back to videos daily...
Thank you! These videos are great. I am learning so much, you are an excellent teacher.
I just wanna say thank you for doing this, I'm not fluent on English and neither on electronics stuff, but you explain things as easy as possible, so even I can understand those things, but it's a little bit difficult to understand your accent and I use subtitles😅 Thank you a lot
You are truly amazing! Most I've ever learned about electronics in my life. You make it easy to understand!
Thank you
Another amazing lesson. Thanks so much!
Thank you for doing what you doing, your time is appreciated very much and you are really helping us, please keep it up and all the best for you 🙏
I really appreciate the amount of effort you put into these videos. I grasp things I have never understood in the past. I hope you get a good return from youtube! I will keep commenting etc. to hopefully positively effect the algorithm. Many thanks again.
This is great! Note that if you're always testing with 100khz you can skip the divide by 628000 multiply by 1 million and just multiply by 1.592 (which is around 1 million / 628000). That will take you straight from ohms to uH
Here is an Inductor marking code calculator
www.basictables.com/electronics/inductor/inductor-codes
In the calulation of L in microhenrys you can simplifiy the calculation further
L=R/628,000 x 1,000,000 is the same thing as L=R/0.628 if you want L in microHenrys
Enjoy 🙂
Thank you
excellent tutotrial, I learned something today. Liked and subbed. thank you.
Quite interesting. I have that same ESR meter and I´d never had thought about using if for this purpose.
The back EMF explanation is also quite good. Before I knew it, now I get it.
Thanks, Richard.
@JosephGSX Have you seen the videos where I use the ESR meter to trace short circuit MosFETs in multi-phase VRMs?
I sure haven't seen it yet, so I'll put it up in the queue of interesting things to watch here. Thanks!
@@LearnElectronicsRepair my next watch
I read this comment before I saw it in the video, now I wait with baited breath.
Brilliant fella, thanks for your time and effort! 😉
So impressive. I have learned alot .
Thank you for your time and effort great utility for the young and not so young learning about electronics in a practical manner we appreciate it!
Glad I found this channel it's really great 👍🇮🇪
These videos are gold, really enjoy them. It's worth mentioning as well that if accuracy matters to some that there are more comprehensive testers for this but can get very pricey, very quickly.
Peak Atlas do very good testers at a more competitive price point in the form of a LCR45 that will do 0.0uH to 2H, resolution typically 0.2uH, accuracy typically ±1.5% ±0.6uH and will do auto or manual test frequencies of DC, 1kHz, 15kHz and 200kHz, these retail at £90 plus VAT. Peak atlas do a slightly cheaper LCR40 but with less range.
Peak atlas do many other testers like ESR, component testers etc. they seem quite popular among techs, I suppose because of price/performance ratio before going to lab grade expensive stuff. I also own the testers in this video and are good enough for the most part and get you in the ball park but if accuracy is a must, as with everything, more money needs to be spent.
Yeah I have the Peak Atlas DCA55 semiconductor analyzer and I love it. You no doubt saw me use it in some of my videos. It's a fine piece of kit.
@@LearnElectronicsRepair Yes absolutely, I'm planning on upgrading some of my kit to peak atlas stuff very soon. I understand and like how you pitch these videos for the beginner who maybe doesn't have all the kit or maybe doesn't quite know how far they will get into and doesn't want to drop a load of money on expensive gear, or even if they do get into it, what kit can you get away with. I just wanted to throw it out there about these cheaper testers, which I thought was the only thing left out of the video when it came to the subject of testing. I know you don't need telling Richard, my comment was more for the viewers, so they dont go out rushing to buy kit before knowing the caveats ;)
@@Adrian_Finn You input and suggestions are valued as always 🙂
In the case of repair I think probably it is not necessary to measure the value of an inductor. I can see possibly that it would be useful to do that if you have some salvaged parts and want to know what value they are.
Possibly measuring a lower inductance than the rated value could help in finding inductors with shorted turns - if you knew the rated value. Really to test those faults you need a 'ring tester' and anyway mostly you find that sort of fault in Transformers rather than inductors so I didn't mention it in this video. But I do intend to get/build a cheap ring tester and play around with it on another video.
I did wonder while making this video if an inductor with a shorted turn would not show a further reduced inductance if you wrapped a second shorted turn around it - I thought maybe it would be a good way to detect shorted turns, but when I experimented with the idea, wrapping a second shorted turn around it just made the inductance go lower again. Nice idea, I thought, but it didn't work. 🙄
Actually I don't think I have ever found a faulty inductor, although it is possible some faults I could not diagnose were down to inductors I guess. I have seen quite a few faulty transformers, and some that had burnt up on the primary winding. Also faulty line output transformers back in the days of CRT TV. Transformers will be another All you need to know topic soon.
@@LearnElectronicsRepair Thanks Richard, I do get worried that my comments seem like a negative criticism, of course I never mean it that way. 🙂 looking forward to the next one.
@@Adrian_Finn No worries - and I am certainly not beyond criticism LOL
Great video series about electronic components i first started learning electronics like this, all i can say is that those "cubic" through hole inductors that have a label on them are a pain to remove with a micro soldering iron and a desoldering pump or braid and they get hot to touch i think a desoldering gun is a must to remove them, now i don't even think about messing with them
Another great video with clear explanations. Thank you and please keep up your work.
Breakfast and one of your videos. That's my daily routine these days... :)
I did it yesterday morning, I'm in Australia and when I got up I saw a new video posted by Richard. I was sitting in front of the telly eating my breakfast, eyes glued to the tv and my wife said I look like one of the kids watching Saturday morning cartoons!
Great explanation!
Thanks for sharing your knowledge. Another great video
My pleasure!
Great video thanks for sharing your knowledge 👍🤗💯
Great video, Ive just had time to watch it although i did like it when it got posted and watched a wee bit. I dont know if i missed it or if you going to cover it in another lesson. I was looking for the fly back diode used in coils and was expecting to see it. Great video i learned a few things, thank you.
I did mention back EMF, which is what the flyback diode is intended to remove. I'll remember to talk about it in the Diodes tutorial that is coming up
@@LearnElectronicsRepair Amazing! Yes you totally did mention the back emf and the reverse polarity and you even mentioned it can effect the device its powering when it get turned off. It would have been good to have mentioned a common solution for this problem which is of course the fly back diode. Thank you i did learn a ton too.
@@NewbFixer True true, you are right, I probably should have mentioned that. 🙂
@@LearnElectronicsRepair your still one of the best teachers on youtube!
Thanks for the video
33:30 that what you measure with shorted secondari is the leakeage inductance on primary
great video, at 16:43 one of the audio channels is missing for a short time.
Love your content ! Really can’t thank you enough for the information you are putting out here for Neanderthals like us .. I would love to see you do a similar video on optocouplers and optoisolators
first here , very straight to the point and practical explanation
Thank you. This is what I hoped - just Everything you need to know to fix stuff 🙂 An educational video should be like a woman's skirt - long enough to cover everything but short enough to be interesting 🤣
Great video Thanks
Thank you very much
I see them in usb charging port using SMD, it is used in later version of Chord Mojo DAC
mine was melted away
marked as FB
not sure if it is inductor
TDK MPZ2012S601ATD25
Ferrite Bead, 0805 [2012 Metric], 600 ohm, 2 A, MPZ Series
Great vid as usual :) Can you also cover negative voltage topic?
Inductors can also look like surface
mount caps
Knowledge 😊
The value of the resistor should be printed in the board too it would make repairing a lot easier.
Great content, just a question, I have a motherboard with the toroidal type inductor on the vrm, can I change this type of inductor to the “modern” ones (the cube-shaped shielded inductors)?
There are properties of toroidal inductors that make them superior to other shapes for some applications. They are still very much used in modern designs. I've designed a lot of industrial switchmode power supplies. Every single one has used at least one toroidal inductor.
So how do we replace larger 4-pin older inductors with new smaller ones.
Thats intersting. I always wonder what's the job of an inductor. But still it isn't clear. A bit more explanation about it in the circuit would be helpful.
See if this helps th-cam.com/video/-UUXy8BxXb4/w-d-xo.html at 01:36:51 it is about relay coils and back EMF but this is true of any inductor coil
7:16 Inductors don't normally have an extra return path, do they? Is the resistive pipe like a snubber, to catch the backflow?
His water wheel analogy, especially that small "bypass" pipe is extremely weird. No such thing exists in a simple inductor.
I’ll try using a freq counter to get a f reading on my ESR tester.
ESR testers don't necessarily use a fixed frequency.
One method of measuring ESR is to apply a pulse of known current magnitude to the capacitor under test. If the ESR were zero, the voltage across the capacitor would begin to rise linearly from zero. With ESR you will get a step rise in voltage at the start of the pulse equal to the applied current times the ESR. You see this thing very conspicuously in switchmode power power supplies.
If your ESR tester works this way, it will probably be useless for measuring inductors (an inductor would force the current to start at zero so you'd get a large voltage step).
Great video! Are you able to assist in fault finding a dead Evga psu. I found an expanded capacitor and replaced but still no joy with it. Any pointers would be great. I’ll happily donate😀
what if I have a simple air core coil and I don't know what the inductance on it should be, and the lcr is reading it as a resistor
10:50 Are you saying a single inductor can step voltage without a transforming second winding?
I accidentally broke a tiny inductor that is shaped like a rectangular bench , I don't know if this will make my motherboard not to work . the inductor is so tiny that it would require micro soldering
Did I miss something regarding the difference in inductance dependant on the type of core used?
I didn't notice anything about core materials.
They make a HUGE difference not just in inductance as such but the overall properties of real inductors. In switchmode power supply design choice of inductor core material is not a trival task.
@@d614gakadoug9 Exactly.
i repair an amplifier one things that tricks me the inductors it the side of a resistor I couldn’t worked it out it very smalls
Memory effect is in household devices, in the motor’s coil! Unbelievable. It can be fixed by fully offloading the motor, and to start it 20x or more.
27:31 - Can you say, “Tongue in a knot” fast, three times in a row?
How to measure a inductor on a circuit board?
why is there a bypass in the water analogy i always thought inductors just had a series resistance and because of that some kind of protection circuitry like a freewheling diode is needed
Nothing analogous to that weird bypass pipe exists in an ordinary inductor. It may exist in the external circuit.
1:13 "Magnetic" material? Or "electrically magnetizable"? I mean, the core is never "magnetic" on its own, before current is applied, right?
That is correct in general.
Sometimes a permanent magnet separate from but attached to the core is used to "bias" the core material to make the behavior sort of asymmetric. This sort of thing was often found in the circuitry for a television CRT.
Does the direction the wire is wound on the inductor matter?
Not for a single-winding inductor.
If an inductor has multiple windings the directions of the individual windings _relative to each other_ are very important.
HI HI can i replace a pex_ ovreg_sw 1uf with a Value2.2 uH inductor on a gpu
So basically an inductor and a coil is the same ?
In practice many inductors are indeed coils of wire. Coiling allows the magnetic field around a conductor to act not only "locally" on the conductor but also on adjacent turns. In general inductance is proportional to the square of the number of turns.
ALL conductors exhibit inductance. Even a tiny surface mount resistor or capacitor has "parasitic" inductance.That inductance, especially in capacitors, can be detrimental in some applications. The copper tracks on a printed circuit board have inductance that can be a big problem in some types of circuitry.
Some people do refer to inductors as "coils." "Choke" is another term. It used to be quite common but isn't so much anymore. You'll hear it more in reference to inductors used for filtering applications both at low frequency (e.g. for "smoothing" after the rectifier in a vacuum tube amplifier's power supply) and at high frequency.
🙏🌹
The sound of your is not clear to me
Dumb question?
73years old and still repairing electronics great videos