How can I miss this video all these years. Elegant technique. And beautiful way to demonstrate control theory.

Great video thanks for your time and effort it is much appreciated. You are a great teacher! I know you did this years ago but your videos are helping an old fella get his head around electronics today.

This is one of the best tutorials I have ever seen. Thanks. You are a wonderful teacher.

man so cool...your description is so simple to understand. anyone with basic knowledge in electronic can make. you make it that so simple... There is complicated circuits for this but this one is simply the best..

So much positive feedback for negative feedback! The kids of my colleagues at work get a kick out of this each year during Bring Your Kids To Work Day. Thank you Shahriar!

As I have commented many other times, you are a good guy! it is so awesome and inspirational that you are giving back, it makes me want to be a better person... Back in the 90's I did a very similar magnetic levitation project as part of a controls class final project except we needed to do a full blown analog controller, as I recall it was much more complicated than your approach. Thanks again

Excellent Video!!! Thank you, I really appreciate the way you take the time to explain the circuit and the build. Not many people do that !

very high quality videos packed with clear explanations....and neat work. you deserve a high quality thanks.

Another excellent video, demonstrating principles very clearly and then a practical demo! Keep up the good work.

Thanks. Watching your video always gives a high as if I am physically doing it. You clear the possible doubts on the way and is a very effective teacher.

I absolutely love your videos and the way you can explain difficult subjects. im glad you're reaching a milestone in the amount of subscribers, that only means we get to enjoy more quality content. thank your Mr Shahriar.

This is an excellent explanation, easy to understand without being too simple, and detailed enough without being confusing.

A wonderful project and a top-notch explanation of the theory behind it!. Your videos are always instructive and entertaining. I really appreciate the effort.

Great effort and thank you for such great videos - much appreciated!!!!

Man i Loveeeeeeeeeeee this channel , thanks for the great explanations and tutorials , please keep up the good work , your fans from London .

Well, there's another one that you hit straight out of the ballpark. Super! Absolutely stupendous! If you're ever in Houston I'd be happy to buy you a beer! Thanks for all of your hard work.

Excellent video! Really well explained. You are a great engineer.

Thank you Signal path blog .Another really good video .

Excellent! Another great tutorial from you!

I LIKE THE SETUP!!! Simple and easy Explanation are great in every single video!!! Keep up the good work I am learning a lot thanks to your videos

Thank you very much for your effort for making this very educational video. Your teaching style is innovative, not many people make cool projects and explain them.

Awesome video, you are a big inspiration to me and I can imagine to many others.

What a neat little experiment !

Your videos are so creative and well explained. Who would ever have thought to use levitation as a lead in to understanding PLL's. Genius.......... Thanks

Another great video. Much appreciated. You are in inspiration to so many - the 5k subscribers you mention at the end of the video is now 30k! Including me. :)

this helped explain hall effects pretty well. I'm currently trying to make a diy 500g-1kg (it be great if more) electro magnetic levitator with conventional metal infused PLA filaments with my 3d printer. its a very slow tedious process but im finally making some leeway in my current prototype demo thanks to this video. I need to find a real ferrite outter circle though for the 3d printed electromagnets (used electromagnetic filament for the base of the 4 electro magnets and copper wire wrapped around)Thank you!+thank you to all the commenters putting a lot of other equations here.

Thanks for that. Your an excellent teacher, keep em coming.

Amazing video, thank you!!

Hey man, I've just found you yt channel, your videos are awesome, keep teaching us! Thanks!

thanks for you valuable job on teaching guys how to make a circuit that really works. You are so great. I will build it for my self.

Excellent video. Thank you.

Great video. Thanks a lot. Best regards from Victor Micha. Mexico City. 🇲🇽

As usual a very nice video. Thanks

Excellent !!, enjoyed the video

Neat. Can't wait for the future videos you are talking about.

Bravo! Excellent Electronics Video!

Fantastic video, as we have come to expect :) Thanks very much.

Another great video. Instead of KA7500 you can also use TL494, AFAIK they are identical and both can be found in old computer psu, best way to recycle old parts.

Great video as always, well done.

Great Video! Very Informative!

The full schematic of the project is available on my website. All the part numbers are available and there is even a link on where to buy the electromagnet. The rest is up to you! :)

This is such an interesting video. Thanks very much!!!

Thank you for the prompt reply.

Excellent experiment. Simply put : Food for the brain :). BTW I know students from the local university that follow your channel with 10x more dedication than all the courses they are having.

Awesome video and awesome teaching thanks!

Fantastic video. Very clear & informative. Now know what my next project is going to be Keep up the good work :)

Great demonstration!

This is still a great video. Thanks 7 years after the fact.

I love your videos, you're such a good teacher. I felt that I should tell you that =)

As always, Excellent. Thanks.

Great video Thank you for all your inspiring ideas. Is it possible to get the schematics of the setup and the list of the parts used? Thanks again.

Nice video on levitation!

Loved the video, brilliant

I love the two Hall-effect sensor idea, that's genius. It appears as if you have damaged the two large electrolytic capacitors during your fine-tuning. the tops of them are obviously bulging after too much heat was generated internally.

Nice one! Good for teaching

from Bolivia SudAmerica thank you your videos are amazings!!!!!

Great explanation.Thanks very much!

Great video, really takes the snore out of my controls class and gives more intuition as to what and why i study controls. But if i do build this gadget i'd probably try to make it levitate using a knight rider effect on it. But again thanks for the inspiration and intuition, looking forward to more videos from you.

👍👍 Great learning material!

You are a very good teacher. Thank you..

You keep me studying even when I'm trying to take a break!

Great show. I sent it to my nephew to enjoy as well.

I will try this analog ciruit it is just GREAT!.....Thanks

This is the best video on this project. I am building this right now so it's very useful. I have one question: Is it necessary to establish a PWM using an oscillator, or I can directly use the output of the op-amp to turn the electromagnet on/off? I don't have the KA7500C IC, was wondering if I can use something else instead if I understand what's needed..

Awsome looks sooo simple when u do it.

Loved the video.

Great illustration, nice lesson, can it be done just with magnets without circuits and electronic components?

Realy good job!

Awesome video keep it up!

very well explained. Thanks.

Many thanks for a super video.

Great video and very well explained Thanx I really enjoid that

Thank you! great video..

Very interesting and informative, thanks,

Great Job Man

first of all, i must tell you that i'm really happy to see such a professional yet simple approach to building this circuit. now, i have one question: what time base did you set on your oscilloscope? i'm planning to build something like this but more simpler (with just one hall sensor and one comparator) and i need to know approximately how much does my comparator needs to be fast :)

I enjoyed this video!

Great video! Thank you for making it for us. You mention that the Hall Effect Sensors that you used were too sensitive. Do you have a recommendation for a better HES for this project? Please and thank you.

Nice videos! Really enjoyed them. What do you use for making such nice schematics?

well done; thank you!!

Excellent !! Thanks.

Thanks my friend.

William, thanks for your observations. Would you please recommend some easy reading material that would give me a good understanding of poles,zeroes and how you saw that the stability would improve by pushing the complex poles solidly in the left hand plane? - Thx

Good stuff! Thanks

I really like those probes you have to convert the oscilloscope probes to something you can connect to a bread board ... any idea what they are called and where I might get some?

good one. Nice.

thanks, very useful video.

Good platform for developing a seismometric sensor.

Thank you, It is well demonstrated, could you guide me wether a miniature maglef elevator or lift could be built by this simple system?

Great video! I will propose this for Bring Your Kids To Work Day. I'm wondering, though, if having reverse current when the ferromagnetic attraction force exceeds m*g, would cause stability issues as pushing does not offer an equilibrium point in the 2 other directions as pulling does.

keep 'em comin!

Is that a reverse-biased (and bulging) cap I see on the top right? Also, fantastic video. The levitation worked better than I would have expected.

Excellent video. And excellent project. Congrats!! Would it be possible to omit the hall sensors and take the feedback from the tiny current that the magnet induces to the coil? Forgive my question I only understand a fraction of what You exposed... My understanding of electronics and circuits unfortunately is minimal... I have an idea of a project that I believe would be very interesting in aeronautics. ( I am only a naive and humble hobbyist ). Thank You and best regards. Victor Micha.

Thanks for a great effort. But did you consider the effect of placing the Hall effect sensor at the centre of the lower core section, in terms of disrupting the magnetic flux.

I have to say that this video was absolutely awesome to say the least! To be honest, for some of your other videos, I have stopped watching after 10 minutes or so because they have been way too fast progressing, too complicated with advanced terminology and generally difficult to follow. This video was the complete opposite. Easy to follow and understand, which made it VERY interesting. Thank you.

You are right. But what I meant is that the IC would work much better, as PWM controller, with some feedback at the error amplifiers. In open loop, with the near infinite gain, the amp works as a comparator and the system runs as bang bang control. The ringing inside the Ton time of the output square wave is the hysteresis loop working at the middle of bandwidth of the feedback loop.

The system has feedback, it does not operate in open loop. In fact, it won't work in open loop at all. There is feedback around the error amplifier which goes all way the way through the electro-magnet, Hall-effect sensor before it is fed back to the error amplifier.

Don't confess to understand it all but very interesting. Thank you.

you are a pro mannn !! I admire your willing to explain and especially your professional and easy understanding explanations!!! !(: I incurage you to continue with your stuff I would like to ask what is the difference between this method of controlling to a pid s ?controlling ! does your controlling is the "p"part from the pid technique

I wonder if the asymmetries in the generated and static magnetic fields are compensated by the system as distance m1-m2 grows large.