This is an incredible explanation of a microelectronics concept that I've had difficulty grasping in the past. Thank you for taking the time to make it clear. Cheers!
The magnetic field, the current created by the voltage applied to the Hall affect device and the force acting on the electrons should be all orthogonal to each other. So on your white board the north pole of the magnet should be behind the white board and the south pole in front. Fleming's Left Hand Rule (for motors) gives these directions (it uses conventional current flow, even though that was subsequently shown to be the opposite to reality) would have the positive of the applied voltage at the bottom of the device illustrated with the negative on the top (if the negative of the Hall voltage is to appear on the right of the of a Hall affect device as illustrated).
You sir, are a wonderful teacher. I can tell that you love knowledge and that you enjoy sharing it with others. You've made this concept very easy for me to understand. Thank you so much, God bless!
This kind of teaching we need in our school system. I really believe when someone explain the things very well, he really understood the subject... I was trying to understand the principle of our turbine meter which has a pickup coil and a rotor. And I'm not sure how the pulses are generated. Now it's very clear to me and i know how to troubleshoot the equipment. Thanks sir.
It would be cool if you "electrically " took us from the radio transmitter we hold all the way through the prop spinning on an electric plane.... and everything in between. These are great and we learn so much!!!!! Thanks Bruce!
As a car mechanic this has helped me understand more how the sensors work in cars Crankshaft / camshaft / distributors mostly use hall sensors. Thank you
Nice quick video. I believe you have the direction of the magnet (magnetic field) mixed up. In the orientation you show the magnetic field is parallel with the movement of the electrons. The cross product between velocity and magnetic field would be zero. The magnetic field would have to be either into or out of the board.
Now this explained the hall effect its been since about 1964 since I studied electronics 🤤 I watched some other guy do an art lesson that left me more confused than when I started thank you for the simple well done explanation
Love your videos. Simple to understand. Gets me there quickly to get a GRASP on the subject. Looking at the thumbs down on a few and wondering why there are as many as there is. Then I realize they are the poindexters that go ( in a nasally voice) ," you said pie is 3.14. Nuh uh, your wrong it's 3.1415." We that watch your videos are laymen and don't have time to watch a 10hr video on the truest form of the subject and probably wouldn't even grasp it anyways. These videos are to get us in the ballpark on a subject and get the AHHHH I kinda understand now. Love your vids Bruce.
That is nice video, and I did learn why this is used rather than a potmeter. However, the explanation is very very very very simplified. In actuality, electrons aren't attracted or repelled my a magnetic field, but moving electrons experience a lorentz force while going through a magnetic field. The magnetic field would have to be perpendicular to the whiteboard in order for it to work (but it's kinda hard to draw).
Everyone seeing this will go, run think they understand it, write it as attracted in the report, their third year lecturer will see this, slap their face and bang their head on the table. Thinking... Did they learn anything at all. Remember, Physicists feel that physics is a crucible degree, its either for people or not. This explanation will make many think that it really isn't for the person who was just confused.
Wouldn't the electrons be redirected in the direction into the whiteboard? Because F=q(E+v x B) where there is no external electric field, but the velocity is up, and the magnetic field is to the left, and the electric charge is negative. So by cross product I expect the applied force would point into the page.
Thank you, Bruce you explain things so well keep up the whiteboard we love it :D cool you talk about vintage ESC pod still have a few Tamiya vintage rc car ESC controlled by a servo and still work after 30 years
Actually they are pushed to the side by the magnet. Which side depends on the pole of the magnet that is closest to the sensor. For the shown deflection the magnet would have come from the direction of the pen on the board, not in the plane of the board. Apart from that a very good explanation.
Well, the electrons themselves are not much affected by the magnet. The moving charge is what gets pushed by a magnetic field. So you have to get electrons moving for them to be affected. That's one thing I noticed.
Hahaha, technically true, I guess that was one of the details he left out to simplify, which I understand as it is not crucial to understanding how hall effect sensors work. Good'ol right hand rule cross products.
One thing I think is most important in educational products: when statement is simplified, it cannot contradict scientific knowledge. "Electrons are attracted to magnet" is this general form is a false statement.
deelkar Really!?! All I can say is.... K.I.S.S. - Keep It Simple, Stupid! C’mon, man! Most of us just want to know how our gimbals control our planes or drones! We don’t want to read a two-inch thick book about the effects of magnetism on a semiconductor. We just want to keep our stuff in the air.
Sorry but I've got to say this: always you get some one trying to boast how good they are ( electrons don't do that), COOL it you guys, Bruce was using the simplest explanations as to what hall effect is, so that everyone can understand. He's not doing a course in advanced electronics.
When trying to teach there is an obligation to get it correct. I'm sure Bruce once knew this stuff and 5 minutes spent revising would have resulted in a video that was substantially correct. This video is mostly incorrect.
mick sharp well said. I know nothing about electronics, this is WAY over my head, but Bruce has a real skill at explaining a subject that is mysterious to me. To all those who want to correct him...get your own channel.
Hello Bruce! Great video again, love the whiteboard! Would love to watch a whiteboard video about optimization of power combo, from props to batteries, going through motors and ESC's, taking into account the weight or flying characteristics desired. I know it's way too much for your small whiteboard and your almost finished markers, but you have managed yourself to explain so many things that I would think this is not a big task for you! Thank you for your passion!
You are the teacher ive been missing my whole life idk how kany videos ive randomly watched but you hleped me understand so easily ive been wondering lately what effect a magnet would have on current, thank you !!!!!! Is there any way i can get specific answers on certain questions not normally asked?
Thanks Bruce ...ah the whiteboard , reminds me of my physics lessons run by an ex army colonel. He used to push Mercury around his desk with a pencil , to demonstrate its properties at room temp!
I used to do that as a child back in the 1940/50s :) No-one bothered much about the potential health hazards in those days. We also once had to draw mercury up a pipette for a school science experiment - one guy sucked too hard and got some in his mouth ! Excellent video btw. I'm a retired electronics engineer a little older than Bruce so I'm aware of some of the simplifications but I don't think they matter too much if the basic ideas get across which is all that matters in this case.
Belper Flyer Yes Bruce explains very well , its like having a private Tutor in Aeromodelling . Was wondering what Hall effect was on my Taranis plus ltd edition. Hope that boy had no ill effects from the Mercury incident!
The GMR effect (and its relatives) is often used for compass chips these days as its much more sensitive than the Hall effect (GMR effect is a quantum / spintronics phenomenon). For stronger magnetic fields sensors will indeed mainly be Hall effect. All conductors exhibit the Hall effect, but its a tiny small effect in metals which are very low resistivity. Being a semiconductor does not have the advantage you describe as holes and electrons cancel out partially - they both get pushed the same direction. The key point is you need a conductor with a very high resistivity (such as a lightly doped semiconductor). The sign of the Hall constant depends on whether electrons or holes dominate the current. The field strength of a magnet drops off as the inverse cube of distance, not inverse square, this is because magnets are dipoles, not monopoles.
I don't like you saying that the electrons are attracted to the North pole as they're not really attracted to either. For the electrons to be attracted that way you'd have to have the north pole of the magnet behind the whiteboard (away from the camera) and the south pole in front of it (towards the camera).
Good side, is entertaining and sort of explains the Hall effect. Room for improvement: electrons are NOT attracted to the magnet (nor repelled by it), the experience a force perpendicular to their velocity and the magnetic field. In the video they would not arrange themselves on the sides but in the back of the whiteboard, leaving positive ions in the front (as they would do with semiconductors too).
*Warning* : The explanation in this video is not correct. Electrons or any charge is never attracted or repelled by magnetic field. Magnetic field exerts force on, say +ve charge (q), by this formula F=q(VxB); So the force exerted by magnetic field causes the +/-charge to move perpendicular to the direction of motion and also to the magnetic field. For proper explanation checkout this video ruclips.net/video/xbGeMx0zOoc/видео.html
I'm very slow at grasping anything in the topics of physics but what I always tend to do to help me grasp it is to look at the foundation of most all things which is the table of elements I think we are on 118 of them, also I remember the fact that as humans we try to control things for ease of use so for instance if we have 600 volts power source and all we want to do is power a 60 watt light bulb we need to find a way to step down the power and obviously that's where all the components like capacitors and semiconductor come into the equation.
Actually the magnetic field falls off as 1/r^3 (not 1/r^2). Remember, there's no monopole term in the expansion of magnetic fields unlike electric fields
I’m really struggling to find anything on Mr Hall on RUclips. Seems a bit like how Tesla wasn’t talked about when I was doing my Australian electrician trade school in the early 1990s.
Such an enthusiastic conductor. We love you for all the conducting you do.
I'd say semiconductor as his lecture affects my knowledge more than other conductors.
Wye bother? Does it relay matter?
This is an incredible explanation of a microelectronics concept that I've had difficulty grasping in the past. Thank you for taking the time to make it clear. Cheers!
I explained it in a much better and simpler way.
ruclips.net/video/DtIz_HACSPI/видео.html
The magnetic field, the current created by the voltage applied to the Hall affect device and the force acting on the electrons should be all orthogonal to each other. So on your white board the north pole of the magnet should be behind the white board and the south pole in front. Fleming's Left Hand Rule (for motors) gives these directions (it uses conventional current flow, even though that was subsequently shown to be the opposite to reality) would have the positive of the applied voltage at the bottom of the device illustrated with the negative on the top (if the negative of the Hall voltage is to appear on the right of the of a Hall affect device as illustrated).
So this entire 11 minute video is incorrect?
Simplifying stuff is a skill , RESPECT.
You sir, are a wonderful teacher. I can tell that you love knowledge and that you enjoy sharing it with others. You've made this concept very easy for me to understand. Thank you so much, God bless!
This kind of teaching we need in our school system. I really believe when someone explain the things very well, he really understood the subject... I was trying to understand the principle of our turbine meter which has a pickup coil and a rotor. And I'm not sure how the pulses are generated. Now it's very clear to me and i know how to troubleshoot the equipment. Thanks sir.
Thanks for that video, this is certainly the best explanation I've seen so far.
You are incredible at teaching and explaining, I love your sense of humor!
I explained it in a much better and simpler way.
ruclips.net/video/DtIz_HACSPI/видео.html😊
Fantastic video, I looked everywhere for good explanation and I couldn't find a better one! Thank you for uploading.
I've never seen the letter "S" written bottom to top. Great video: simple explanation of a complex subject.
It would be cool if you "electrically " took us from the radio transmitter we hold all the way through the prop spinning on an electric plane.... and everything in between. These are great and we learn so much!!!!! Thanks Bruce!
As a car mechanic this has helped me understand more how the sensors work in cars
Crankshaft / camshaft / distributors mostly use hall sensors. Thank you
Bangersnsmash Uk The mirror-mounted compass in many cars has one, too.
i love these electrical theory videos Bruce! cheers!
It's not a theory...
I explained it in a much better and simpler way.
ruclips.net/video/DtIz_HACSPI/видео.html
Learning the Hall Effect from a bloke in a flannel. Love it :)
Good explanation of a "mysterious" electronics term. I LOVE this sort of video. Many Thanks Bruce.
Nice quick video. I believe you have the direction of the magnet (magnetic field) mixed up. In the orientation you show the magnetic field is parallel with the movement of the electrons. The cross product between velocity and magnetic field would be zero. The magnetic field would have to be either into or out of the board.
Love these types of videos. Thanks Bruce!
Thanks bruce...helped me understand my hall effect distributor, on my truck
Excellent explanation. Thank you so much. You’ve really made this very clear and are unique in your ability to make the complex understandable!
Thanks for the great video. This is the best explanation I've see so far. Looking forward to more of these theory videos.
Tq for ur great explanation Mr. Bruce.
+3 for the Aussie accent!! Love from Sacramento, California sir!!!!!!!!!!!!!!!!!!!
Excellent teaching about sensor sir ,thank you sir.
I did learn something today. Thanks.
Very good video. Clear and instructive. Thanks much.
Thanks Bruce, makes it simple to understand.
Now this explained the hall effect its been since about 1964 since I studied electronics 🤤 I watched some other guy do an art lesson that left me more confused than when I started thank you for the simple well done explanation
Learned something today! Thanks for the video!
That was a bloody wonderful explanation, well done!
Thanks, you explain very nice I understand immediately
Very interesting clear and well explained thanks
You are the cool professor we never had.
Thanx. That was informative and fun. Well done.
Love your videos. Simple to understand. Gets me there quickly to get a GRASP on the subject. Looking at the thumbs down on a few and wondering why there are as many as there is. Then I realize they are the poindexters that go ( in a nasally voice) ," you said pie is 3.14. Nuh uh, your wrong it's 3.1415." We that watch your videos are laymen and don't have time to watch a 10hr video on the truest form of the subject and probably wouldn't even grasp it anyways. These videos are to get us in the ballpark on a subject and get the AHHHH I kinda understand now. Love your vids Bruce.
Love these types of vids... Always fun to learn how everything works.
Very useful information thanks to you I have never had heard about it before
That is nice video, and I did learn why this is used rather than a potmeter.
However, the explanation is very very very very simplified. In actuality, electrons aren't attracted or repelled my a magnetic field, but moving electrons experience a lorentz force while going through a magnetic field. The magnetic field would have to be perpendicular to the whiteboard in order for it to work (but it's kinda hard to draw).
Everyone seeing this will go, run think they understand it, write it as attracted in the report, their third year lecturer will see this, slap their face and bang their head on the table. Thinking... Did they learn anything at all. Remember, Physicists feel that physics is a crucible degree, its either for people or not. This explanation will make many think that it really isn't for the person who was just confused.
Also, some ESC for brushless motors (most of the sensored ones) use Hall effect sensors as a feedback, to control timing.
Tiago de Pádua
Yes, I got one by taking apart an old computer fan to make a hot wire detector. Very useful.
Wouldn't the electrons be redirected in the direction into the whiteboard? Because F=q(E+v x B) where there is no external electric field, but the velocity is up, and the magnetic field is to the left, and the electric charge is negative. So by cross product I expect the applied force would point into the page.
Thank you, Bruce you explain things so well keep up the whiteboard we love it :D
cool you talk about vintage ESC pod still have a few Tamiya vintage rc car ESC controlled by a servo and still work after 30 years
Yes please, an explanation of how those solid state gyros work. Black magic I guess. Keep up the great work Bruce.
I was told the accent is learned by a very young child. Lip movements are recorded. Very good explanation.
I’m glad to see Whitey Bulger decided to make a career change .
Also, excellent explanation , thanks !
Thank you Bruce.
You are a excellent physics teacher!
Actually they are pushed to the side by the magnet. Which side depends on the pole of the magnet that is closest to the sensor. For the shown deflection the magnet would have come from the direction of the pen on the board, not in the plane of the board. Apart from that a very good explanation.
Well, the electrons themselves are not much affected by the magnet. The moving charge is what gets pushed by a magnetic field. So you have to get electrons moving for them to be affected. That's one thing I noticed.
Hahaha, technically true, I guess that was one of the details he left out to simplify, which I understand as it is not crucial to understanding how hall effect sensors work. Good'ol right hand rule cross products.
One thing I think is most important in educational products: when statement is simplified, it cannot contradict scientific knowledge. "Electrons are attracted to magnet" is this general form is a false statement.
deelkar Really!?! All I can say is.... K.I.S.S. - Keep It Simple, Stupid! C’mon, man! Most of us just want to know how our gimbals control our planes or drones! We don’t want to read a two-inch thick book about the effects of magnetism on a semiconductor. We just want to keep our stuff in the air.
Sorry but I've got to say this: always you get some one trying to boast how good they are ( electrons don't do that), COOL it you guys, Bruce was using the simplest explanations as to what hall effect is, so that everyone can understand. He's not doing a course in advanced electronics.
When trying to teach there is an obligation to get it correct. I'm sure Bruce once knew this stuff and 5 minutes spent revising would have resulted in a video that was substantially correct. This video is mostly incorrect.
mick sharp well said. I know nothing about electronics, this is WAY over my head, but Bruce has a real skill at explaining a subject that is mysterious to me. To all those who want to correct him...get your own channel.
Jim, AMEN to that!!!!
Jim Goodwin Well stated!
just curious what were some things that were incorrect?
Do you ever get a Hall effect when you walk along a corridor?
No... but I really a-door walking down corridors anyway. :-)
If there are three doors at the end of the corridor, you get the Monty Hall effect.
If there's a group of smokers you might see small Hall effect
Ok
If there is a hot babe at the end of the corridor, I get a Hall effect in my pants.
Hello Bruce! Great video again, love the whiteboard!
Would love to watch a whiteboard video about optimization of power combo, from props to batteries, going through motors and ESC's, taking into account the weight or flying characteristics desired.
I know it's way too much for your small whiteboard and your almost finished markers, but you have managed yourself to explain so many things that I would think this is not a big task for you!
Thank you for your passion!
I explained it in a much better and simpler way.
ruclips.net/video/DtIz_HACSPI/видео.html
Awesome! Explained simply. Appreciate you!
Thank you. Nice and simple
Thanks for the clear explanation! So much better than the usual CGI + cheesy music crap. Can't beat old school white board....perfect!
GREAT video, Sir!
You are the teacher ive been missing my whole life idk how kany videos ive randomly watched but you hleped me understand so easily ive been wondering lately what effect a magnet would have on current, thank you !!!!!! Is there any way i can get specific answers on certain questions not normally asked?
Thanks Bruce ...ah the whiteboard , reminds me of my physics lessons run by an ex army colonel.
He used to push Mercury around his desk with a pencil , to demonstrate its properties at room temp!
I used to do that as a child back in the 1940/50s :) No-one bothered much about the potential health hazards in those days. We also once had to draw mercury up a pipette for a school science experiment - one guy sucked too hard and got some in his mouth !
Excellent video btw. I'm a retired electronics engineer a little older than Bruce so I'm aware of some of the simplifications but I don't think they matter too much if the basic ideas get across which is all that matters in this case.
Belper Flyer
Yes Bruce explains very well , its like having a private Tutor in Aeromodelling .
Was wondering what Hall effect was on my Taranis plus ltd edition.
Hope that boy had no ill effects from the Mercury incident!
Great enthusiastic explanation, thank you.
I love your disclaimers at the end of technical vids. I suppose they cut down on the geeky nit-picking a little but probably not enough.
;)
Great video. Great presentation. Thanks Bruce
So now I know what the hall effect is. Great video mate.
Thank you so much for your help! A great easy to understand explanation!
you explain it really well!
I always like watching your videos. Thank you.
Your whiteboard videos are my favorite. Keep em coming Bruce! :)
Thankyou for this vid. Very informative. Keep up the great content.
A very good explanation. Thank you.
very educative. thank you regards
Bloody brilliant. Thanks!
always love when the white board comes out. i know im going to learn something good :)
Hey retro! I like your style! Nice work!
The GMR effect (and its relatives) is often used for compass chips these days as its much more sensitive than the Hall effect (GMR effect is a quantum / spintronics phenomenon). For stronger magnetic fields sensors will indeed mainly be Hall effect. All conductors exhibit the Hall effect, but its a tiny small effect in metals which are very low resistivity. Being a semiconductor does not have the advantage you describe as holes and electrons cancel out partially - they both get pushed the same direction. The key point is you need a conductor with a very high resistivity (such as a lightly doped semiconductor). The sign of the Hall constant depends on whether electrons or holes dominate the current.
The field strength of a magnet drops off as the inverse cube of distance, not inverse square, this is because magnets are dipoles, not monopoles.
Very clear, thank you. Please discuss the different types of Hall sensors, especially the quantum hall sensor. That sounds interesting.
Brilliant teacher, thanks very much 😊
great one Bruce......I had a go at explaining hall and its benefits in one of my videos but not a patch on your explanation.....
The explanation was superb. Especially the bit with the op amp . . . you might include a Schmidt trigger in your next one.
Great video Mr. White!!!!
I thoroughly enjoy your videos. thanks
I don't like you saying that the electrons are attracted to the North pole as they're not really attracted to either. For the electrons to be attracted that way you'd have to have the north pole of the magnet behind the whiteboard (away from the camera) and the south pole in front of it (towards the camera).
Thanks mate fascinating as always , ..
This is a great help! Thank you RCMR:)
Good side, is entertaining and sort of explains the Hall effect. Room for improvement: electrons are NOT attracted to the magnet (nor repelled by it), the experience a force perpendicular to their velocity and the magnetic field. In the video they would not arrange themselves on the sides but in the back of the whiteboard, leaving positive ions in the front (as they would do with semiconductors too).
*Warning* : The explanation in this video is not correct. Electrons or any charge is never attracted or repelled by magnetic field. Magnetic field exerts force on, say +ve charge (q), by this formula F=q(VxB); So the force exerted by magnetic field causes the +/-charge to move perpendicular to the direction of motion and also to the magnetic field.
For proper explanation checkout this video ruclips.net/video/xbGeMx0zOoc/видео.html
Good explanation sir thanks for sharing
Great explanation - thank you
I'm very slow at grasping anything in the topics of physics but what I always tend to do to help me grasp it is to look at the foundation of most all things which is the table of elements I think we are on 118 of them, also I remember the fact that as humans we try to control things for ease of use so for instance if we have 600 volts power source and all we want to do is power a 60 watt light bulb we need to find a way to step down the power and obviously that's where all the components like capacitors and semiconductor come into the equation.
I explained it in a much better and simpler way.
ruclips.net/video/DtIz_HACSPI/видео.html
Great work! More of this, please!
Thank you for this!
great video, i look forward to the next whiteboard
Fascinating video - even if you have no interest in RC models.
Thank you, very good explanation!
I learned something again. Thanks.
Nice one Bruce..Thanks.
Wow. Residual voltage defined.I love it.
Great great you make it a joy to learn
As usual really interesting. Thanks!
Isn't the movement of electrons inside semiconductors perpendicular to the plane of board when magnetic field is parallel to the same plane?
Tremendous, thank you.
Congratulations Bruce!!!
Actually the magnetic field falls off as 1/r^3 (not 1/r^2). Remember, there's no monopole term in the expansion of magnetic fields unlike electric fields
A channel where the comments are as educational as the videos. That’s for the correction!
Love this teacher
Very interesting! Thank you
I’m really struggling to find anything on Mr Hall on RUclips.
Seems a bit like how Tesla wasn’t talked about when I was doing my Australian electrician trade school in the early 1990s.