The value of your electronics knowledge is exceeded by your skills in communication. Years ago I rushed through a college EE absorbing everything but not truly grokking it. Now I have the leisure of enjoying the craft and your videos are just a pleasure to consume like a fine meal. There are few UA-camrs with these communication skills and it would be valuable in the long term for your videos to not only be stored on this one platform. Links break and platforms die, I hope these videos will survive - for the future generations (the ones who will have to repair all the old FET technology handed down to them)
Hands down, this is the best explanation of basic FET operation that I've ever heard and I have a PhD in analog circuit design! Great great video. Made my day that this is available.
You are welcome. Your presentation was very clear, you used the correct terms (like carrier), your demonstration verified your explanation. Just great. BTW, my advisor was this guy, www.aicdesign.org/, he wrote the 'Red Book'. Well that's what they called his CMOS book in the late 80s. I'm now poking around to see what you cover. Have a great day!
I have the "red book", nice companion to the "blue book" (Grey & Meyer). To make it easier to find videos on my channel, I maintain a complete index that is arranged numerically and by topic. It's a PDF, so you can search it, and each video is linked. Here is a link to the file that I keep up to date: www.dorkage.com/youtube/W2AEW_video_index.pdf
w2aew yes, we all had the blue book as well. The Georgia Tech analog design group was little biased towards the red book, seeing that we could easily consult with author. Dr Allen and I are working on a vacuum tube design course right now. I'll be sure to reference this video as a preliminary FET refresher. JFETs are just like triodes, kind of thing. I'm looking at your index pdf right now. Thanks
I just love your tutorials! Your drawings are so well thought out and drawn. I'm a 73 yr old mining engineer who couldn't get enough electronics in college, but we barely had transistors then. I will probably ask ignorant questions, but about much of this information I am ignorant. Thanks so much for what you do!
You are really a good tutor, teacher and presenter. We can appreciate this even more now during this pandemics, since many of us teachers are having to prepare video-lectures. This may look easy to do for the one watching. One clear indication of your talent is your fluency. Your videos have little cuts, usually related to change of settings/equipment, no cuts related to your text. You make it very simple and practical, no fancy boards or "special effects".Yet the content is quite clear and objective. I have been teaching Physics at the university for many years now. I believe your channel, including the pdf index, should be set as one of our world resources, since your style (direct to the point) is very useful for kids in technical schools and engineering students. Congratulations.
FINALLY! A clear & comprehensive presentation on Field Effect Transistors. I've been struggling to get a foothold/foundational understanding of these for years. While I've known there is a difference between JFETs & MOSFETs, I couldn't distinguish or get clarification on the subtle nuances of the different types. You Sir, are a modern day Forrest Mims. THANK YOU!
Best video on explaining FETs on UA-cam. I really appreciate your pace and paper and pencil explanations coupled with a scope demo. All your "back to basics" videos are superbly done. Thanks!
I know that this is somewhat arbitrary for most advanced people but for new guys it is very, very useful to see in what applications devices are used. First step of learning - replicate: try to mimic ones work step-by-step, all of it. Second - duplicate: try to make ones device without copying it, but by using ideas You got from set above. Third - upgrade: try to make ones device better. Forth and final: create: make Your own device! See, telling about transistors, FETs and all the other good stuff You're telling, is like fulfilling second to forth steps... Examples are awesome - all the measuring circuits, test circuits etc. Because they fill in gaps for fist step. ... what I am trying to say is ... more fist step! :D :D But great job, really... thumbs up! :)
This is the most educational channel I've seen. You have an excellent way of describing and explaining every concept. I wish I had found this channel earlier, I would be a much better engineer today. Thank you and keep up the good work!
You are the best electronics teacher!!! I'm very happy I've found your youtube channel! Though I'm quite experienced in electronics I have a lot to learn from you.
I have spent the last 30 years as an analog circuit designer. I just found your videos a few days ago. You have rekindled my interest in poking around in the lab. I love the hands-on nature of your videos. I have fallen into the trap of reading papers instead of independent verification as you do. Thanks for the inspiration. I subscribed, and am now watching your other videos. By the way, the family tree of FETs is a great way for me to remember things. Great stuff. As a side note, I too love hand written notes. I work for Caltech, and a bunch of us have fallen in love with an electronic note-taking tool called Good Notes. We use it with the Apple Pencil on iPads. Some of us teach entire classes now with the hand written notes. There's something soothing about it for both the students, and the teacher. It's great for designing circuits and not getting bogged down in a CAD package...
So glad to hear I've inspired you to get back on the bench! I'm a big fan of "where the rubber meets the road". Keep in mind that I maintain an index to all of my videos to make it easy to search for topics you may be interested in. It is arranged numerically as well as roughly by topic: www.qsl.net/w2aew/youtube/W2AEW_video_index.pdf Thanks for the tip on Good Notes, I'll check it out. Lately, I've been using a ePaper tablet for my hand-written notes. It has the same sound/feel as pencil on paper. The one that I use is from www.remarkable.com. Also, please feel free to share any of my videos with your students - maybe we can inspire them together!
At 67 years old I have just started trying to teach myself electronics and have found your videos informative, consise & interesting! Your description of real life applications of the various components is very useful! Thank you for your excellent presentation!
Very well thought out and presented tutorial. Thankyou Alan. In one video you have managed to explain characteristics that took our teachers numerous lectures which still left me confused. Your video nailed the concepts and differences concisely and simply.
Very well explained and quite thorough. It is difficult to pull the characteristics of different devices together, but you did that very well. The only thing you may have left out was a detail about the physical model of a junction FET. Just like the MOSFET, a junction FET has a capacitor across the channel because the substrate is connected to the Source. The gate has a wider geometry than what you showed; at least according to Siliconix literature. The electric field inside this capacitor causes free carriers to migrate away from the channel region near the source and drain, creating depletion regions.
This is the clearest explanation of the "FET family tree" I've found. My brain hurt trying to read the descriptions in textbooks. I love that current mirror trick for watching the current without disturbing the DUT.
You are the best electronics teacher on the internet in my opinion! Thank you so much for putting these videos out there. These are priceless for electronic students!
I learned this theory years ago, and admittedly haven't used it much since. Soaking in your excellent tutorial on the topic is very much akin to meeting an old friend that I haven't seen in years. Super good stuff! Thank you! 73, N6MKC.
This is probably my 10th time watching this video to gasp in depth understanding of transistors in general. Your Back to Basics series are top notch and no other youtubers explains it to this degree. Thank you for taking the time put up these in-depth class-room feel videos! P.S don't ever lose the paper and pen(cil) way of teaching
I've finished two years at university studying electronics and really not understanding how FETs work, its unreal. Thanks for this video. PS just found your channel today and am binge watching all your video lol :)
+JD Dupuy Glad you like the channel. Don't forget about the Table of Content / Video Index file (PDF) that is linked in the lower right corner of the channel's main graphic banner. And, be sure to let me know if there is a topic you'd like to see in the future.
Very nice explanations, Alan. You're a natural at teaching. Thanks! Would you consider a video (or few!) about characterizing power supplies? I've found almost zero comprehensible content that explains Bode plots, gain and phase, poles and zeros, etc. A W2AEW video explaining how to do feedback loop compensation in switchers would be epic.
+FlyingShotsman The videos of Brian Douglas (ControlLectures here on youtube) are very good in explaining the basics of control systems and how to specify/use them, including bode plots, gain and phase margins, root locus plots, nyquist plots and all that stuff. Most certainly worth a look at if you are interested in feedback loops for powersupplies or feedback loops in general (they dont really change)
+FlyingShotsman Transfer functions are not restricted to electronics so an understanding of poles and zeros is isolated to mathematics. Physical interpretations of system responses are like a bridge between math and reality so you can use mechanics, electronics, hydrodynamics, thermodynamics etc whatever floats your boat to "kind of" get a glimpse of what's going on. If you are interested in control theory related to electronics, and are a beginner, I would really recommend starting with concepts of simple oscillating RLC circuits along with methods of damping them. I'm saying this because such circuits are themselfes closed loop systems that can be "compensated". Don't go directly into switchers as it will only add more fog.
Fantastic refresher! I've been away from electronics projects for a while but this video actually answered some questions I had a long time ago. I have to say that I laugh from amazement when I see how organized and diligently structured these lessons are. Master of details. Someday hopefully I will be more like this.
+swiftjeff The organization and structure to this lesson is due to several hours of noodling on various ideas, and countless notes, research, etc., to assemble just the right combination of information and narrative - followed by a few hours of shooting clips, editing and finally posting on UA-cam.
+w2aew Thanks for that insight into what goes into the videos! It provides a different perspective on the many hours I've put into projects, perhaps not as wasted as I have thought.
I loved this video, very well explained, relly professional, shows exactly what a engineer or tech needs to know in a delightful structured master class, thanks a bunch !!
You should definitely bind those notes to form a book like forrest mims :) Need more videos on back to basics. A lot of people will be benefited Thank you for sharing :)
The ARRL should footnote and have links to many of your videos in the General and especially the Extra Class manuals. You have been such a great help to me in understanding such difficult topics as you cover. Thanks so much!!
My knowledge of FET transistors goes so far back, that I still think of them as "newer" devices. At the time I was of the understanding that they were much less resilient than bipolar transistors. Is it true that they are more easily damaged? You can tell I'm an old tube guy. "If the plates are red, just kill the voltage and figure out where you went wrong". My early forays into solid state devices was less than successful because they fail with no visible clue. Thanks for helping an old dog keep learning.
Its very difficult for those of us with learning disabilities to translate acronym speak on the fly. Its like running on a track trying to keep up but every other step there is a concrete block to be negotiated. Yes, I can clearly see what the acronym stands for, but I have to turn the letters into words then input it into my broken processor. Video is great and undoubtedly easy to understand for 90% of the audience.
Thank you so much for taking time to make those videos. The quality of the explanations is amazing and the simple circuits that illustrate theory help a lot. Please keep up sharing your experience of analog electronics.
Beautifully made tutorial thank you. It interests me as a restorer of vintage stuff to note that the Jfet biasing is just like a vaccuum tube cathode bias method.
Thanks! You are an excellent teacher. With your discussion of complex topics such as this, and then your hands on demonstration, I can always learn something. 73
@20:70 i think you mixed between when to use it as a switch and when as an amp, because we drive the device to saturation when we need it as a switch not the opposite ... you are amazing mr alan .. so happy i found you
There is an unfortunate difference between the terminology used for a bipolar transistor's saturation region and a FET's saturation region - they are opposite! For a bipolar transistor - operation as a switch (very low Vce) is the saturation region. But, for a FET, the switch operation (very low Vds) is called the linear or ohmic region. The FET's saturation region is when operating in linear/amplifier applications - the same region that a bipolar calls the active region. It is unfortunate the these two device type use the same name for different regions of operation. en.wikipedia.org/wiki/MOSFET#/media/File:IvsV_mosfet.svg
Super clear explanations. Love the family tree. For somebody like me still figuring out what goes for what, it saved me alot of research. Thank you. Much appreciated
Great video. This is sort of a review of the things I learned, and mostly have forgotten, from my BSEE degree back in the "dark ages" (1976). What I was trying to remember was when to use a JFET and when to use a MOSFET. Most of the videos are on MOSFET technology. 73 de AF6AS.
Awesome... You are the best teacher... My humble request to you would be to write a basic electronics book emphasising the practical aspects of the circuits in a very lucid way as presented in your videos.
Water theory, for electronics, is one of the best ways to teach it that I know of, and I wish that was how I learned it while at tech college. That was how the military taught it, and it's why the Europeans called vacuum tubes, valves. An FET, or transistor, really, works similar to a valve being turned on and off. Similarly, a diode acts like a check valve. It's an easy way of understanding electronics. Ohm's Law was derived from hydraulics as well, from restriction, flow, and pressure. In the early days, voltage was called electrical pressure or tension.
Very nice video, explanation and demonstration. I really enjoy how you stay on point through all your lessons. I wish I'd have had instructors like you when I was in my engineering courses. Thanks & 73 de kb4twn
one of the most informative vids i seen. well at least for me, as concerning mosfet's and cb radio's in final p/a transistor flow chart applications. i hope that isn't confusing. it makes sense to me, and i had to read it several times.
Amazing video as always... One thing I'd absolutely love to see if you take a MOSFET and use it in a simple RF amplifier circuit and make a tutorial out of that. Subsequently I'd also like to see a MOSFET tutorial with an audio amplifier circuit. Pretty please, and keep up the great work.
I love this simple paper and pen with practical demonstration. Btw, has anyone noticed that cute mini scope that sits on top of the function generator?
Thanks for the very helpful explanation. I love your use of current mirror to measure the current without disturbing the main current path. I will be using this. I see JFETs in many variable gain amp circuits and I wondered why not use MOSFETs. After watching this video I guess JFETs have a more useful range of linear region? Thanks again.
I have been puzzling over how mixer and multiplier circuits work. I just passed both my tech and General tests yesterday and they left me with more questions than answers. I know they're not some mysterious component, but Im not satisfied with how they work, I want to know why. Can you point me in the right directions? Thanks, this is really a great video!! I love to breadboard these simple circuits and let my grandsons play with and ask questions about then. Then I play your video and after a number of pauses I'm so pleased to see the lights come on and hear the chorus of "COOL"!!!
Another fantastic video with nice graphic display. Diligent preparation of the notes and the demonstration made it easy to visualize these components. I’d appreciate a video explaining how RF signals flow through these devices. I have a good idea how the AC is cleaned off the signal but am fuzzy on the relationship between current flow, source voltage and amplification of the RF signal. I think source voltage drops as I/sc increases and that causes an amplitude increase. So, taking the G/ssV lower increases the gain?
Thanks for the easy-to-follow instructions on JFET and MOSFET. I wa wondering have you covered any vlog on MESFET? I appreciate all your hard work in giving you audience a great experience watching your video.
I haven't done a video on MESFET. However, functionally it is very similar to a JFET, except that the diode at the Gate is a schottky diode, not a PN junction like the JFET. Otherwise, operation is virtually the same as a JFET.
+Dino Papas Thanks Dino - I'm glad you found it useful. Did you notice that I did a little minor formatting on the subject-wise section of the video index file?
After 6 years still the best intro to FETs on youtube, thank you!
I'll have to agree. After putting this together and following along with a scope, I finally get it. Thanks a lot Alan!
Everything you do is amazing.
+Afrotechmods your videos are pretty good too!
+Afrotechmods Thank you! I love your videos too - great stuff!
we miss you man hope to hear from you soon!
Same with you. :>
@Afrotechmods respect to you too!
The value of your electronics knowledge is exceeded by your skills in communication. Years ago I rushed through a college EE absorbing everything but not truly grokking it. Now I have the leisure of enjoying the craft and your videos are just a pleasure to consume like a fine meal. There are few UA-camrs with these communication skills and it would be valuable in the long term for your videos to not only be stored on this one platform. Links break and platforms die, I hope these videos will survive - for the future generations (the ones who will have to repair all the old FET technology handed down to them)
I also enjoy the comments section - high quality Q&A after the lecture, smart audience questions
Hands down, this is the best explanation of basic FET operation that I've ever heard and I have a PhD in analog circuit design! Great great video. Made my day that this is available.
Thank you very much for comments - it means a lot coming from someone with your education! I have just a BSEE myself...
You are welcome. Your presentation was very clear, you used the correct terms (like carrier), your demonstration verified your explanation. Just great. BTW, my advisor was this guy, www.aicdesign.org/, he wrote the 'Red Book'. Well that's what they called his CMOS book in the late 80s.
I'm now poking around to see what you cover. Have a great day!
I have the "red book", nice companion to the "blue book" (Grey & Meyer). To make it easier to find videos on my channel, I maintain a complete index that is arranged numerically and by topic. It's a PDF, so you can search it, and each video is linked. Here is a link to the file that I keep up to date:
www.dorkage.com/youtube/W2AEW_video_index.pdf
w2aew yes, we all had the blue book as well. The Georgia Tech analog design group was little biased towards the red book, seeing that we could easily consult with author.
Dr Allen and I are working on a vacuum tube design course right now. I'll be sure to reference this video as a preliminary FET refresher. JFETs are just like triodes, kind of thing.
I'm looking at your index pdf right now. Thanks
Your the man to look? -up to. THANKS
After more than 3 years, I keep watching and rewatching this video. Brilliant!
In 20 minutes you managed to explain what my electronics teacher taught in 2-3 months of classes. Truly great refresher video for me. Thank you.
I just love your tutorials! Your drawings are so well thought out and drawn. I'm a 73 yr old mining engineer who couldn't get enough electronics in college, but we barely had transistors then. I will probably ask ignorant questions, but about much of this information I am ignorant. Thanks so much for what you do!
One of the best teachers on here! Listen to this guy. Lots. Thank you so much for your time. 73's
You are really a good tutor, teacher and presenter. We can appreciate this even more now during this pandemics, since many of us teachers are having to prepare video-lectures. This may look easy to do for the one watching. One clear indication of your talent is your fluency. Your videos have little cuts, usually related to change of settings/equipment, no cuts related to your text. You make it very simple and practical, no fancy boards or "special effects".Yet the content is quite clear and objective. I have been teaching Physics at the university for many years now. I believe your channel, including the pdf index, should be set as one of our world resources, since your style (direct to the point) is very useful for kids in technical schools and engineering students. Congratulations.
Thank you - please feel free to share my content with your students.
FINALLY! A clear & comprehensive presentation on Field Effect Transistors. I've been struggling to get a foothold/foundational understanding of these for years. While I've known there is a difference between JFETs & MOSFETs, I couldn't distinguish or get clarification on the subtle nuances of the different types.
You Sir, are a modern day Forrest Mims. THANK YOU!
Wow - that's quite a complement - I learned so much from his Engineer's Notebook books from Radio Shack in the late 70s.
Your style of explaining electronics is black magic and you are a wizard of teaching.
Thank you for your efforts to light up our minds.
Best video on explaining FETs on UA-cam. I really appreciate your pace and paper and pencil explanations coupled with a scope demo. All your "back to basics" videos are superbly done. Thanks!
Thank you. I've been thinking about doing a similar one for Bipolar transistors (BJTs) too.
I love that the multimeter in the thumbnail reads 4007, which is the name of a CMOS transistor array. Thank you for the video, it was very helpful!
Hmmm, was that a "planned" easter egg???? We'll never know ;-)
I know that this is somewhat arbitrary for most advanced people but for new guys it is very, very useful to see in what applications devices are used.
First step of learning - replicate: try to mimic ones work step-by-step, all of it.
Second - duplicate: try to make ones device without copying it, but by using ideas You got from set above.
Third - upgrade: try to make ones device better.
Forth and final: create: make Your own device!
See, telling about transistors, FETs and all the other good stuff You're telling, is like fulfilling second to forth steps...
Examples are awesome - all the measuring circuits, test circuits etc. Because they fill in gaps for fist step.
... what I am trying to say is ... more fist step! :D :D
But great job, really... thumbs up! :)
This is the most educational channel I've seen. You have an excellent way of describing and explaining every concept. I wish I had found this channel earlier, I would be a much better engineer today. Thank you and keep up the good work!
You are the best electronics teacher!!! I'm very happy I've found your youtube channel! Though I'm quite experienced in electronics I have a lot to learn from you.
I have spent the last 30 years as an analog circuit designer. I just found your videos a few days ago. You have rekindled my interest in poking around in the lab. I love the hands-on nature of your videos. I have fallen into the trap of reading papers instead of independent verification as you do. Thanks for the inspiration. I subscribed, and am now watching your other videos. By the way, the family tree of FETs is a great way for me to remember things. Great stuff. As a side note, I too love hand written notes. I work for Caltech, and a bunch of us have fallen in love with an electronic note-taking tool called Good Notes. We use it with the Apple Pencil on iPads. Some of us teach entire classes now with the hand written notes. There's something soothing about it for both the students, and the teacher. It's great for designing circuits and not getting bogged down in a CAD package...
So glad to hear I've inspired you to get back on the bench! I'm a big fan of "where the rubber meets the road". Keep in mind that I maintain an index to all of my videos to make it easy to search for topics you may be interested in. It is arranged numerically as well as roughly by topic:
www.qsl.net/w2aew/youtube/W2AEW_video_index.pdf
Thanks for the tip on Good Notes, I'll check it out. Lately, I've been using a ePaper tablet for my hand-written notes. It has the same sound/feel as pencil on paper. The one that I use is from www.remarkable.com.
Also, please feel free to share any of my videos with your students - maybe we can inspire them together!
At 67 years old I have just started trying to teach myself electronics and have found your videos informative, consise & interesting! Your description of real life applications of the various components is very useful! Thank you for your excellent presentation!
Very well thought out and presented tutorial. Thankyou Alan. In one video you have managed to explain characteristics that took our teachers numerous lectures which still left me confused.
Your video nailed the concepts and differences concisely and simply.
I learn more in your videos than I did in some classrooms. You're channel is incredible!👍😀
Very well explained and quite thorough. It is difficult to pull the characteristics of different devices together, but you did that very well. The only thing you may have left out was a detail about the physical model of a junction FET. Just like the MOSFET, a junction FET has a capacitor across the channel because the substrate is connected to the Source. The gate has a wider geometry than what you showed; at least according to Siliconix literature. The electric field inside this capacitor causes free carriers to migrate away from the channel region near the source and drain, creating depletion regions.
This is the clearest explanation of the "FET family tree" I've found. My brain hurt trying to read the descriptions in textbooks. I love that current mirror trick for watching the current without disturbing the DUT.
Hard to find good quality content about electronics on UA-cam. So I'm saving this to a playlist. This is good stuff, thanks.
Excellent intro to FETs. Really made the operation understandable, thanks!
You are the best electronics teacher on the internet in my opinion! Thank you so much for putting these videos out there. These are priceless for electronic students!
I learned this theory years ago, and admittedly haven't used it much since. Soaking in your excellent tutorial on the topic is very much akin to meeting an old friend that I haven't seen in years. Super good stuff! Thank you! 73, N6MKC.
This is probably my 10th time watching this video to gasp in depth understanding of transistors in general. Your Back to Basics series are top notch and no other youtubers explains it to this degree. Thank you for taking the time put up these in-depth class-room feel videos! P.S don't ever lose the paper and pen(cil) way of teaching
I've finished two years at university studying electronics and really not understanding how FETs work, its unreal. Thanks for this video. PS just found your channel today and am binge watching all your video lol :)
Unreal, so glad I found you. An electronics instruction at a click of a mouse button. Thank you so much for your work and videos!
+JD Dupuy Glad you like the channel. Don't forget about the Table of Content / Video Index file (PDF) that is linked in the lower right corner of the channel's main graphic banner. And, be sure to let me know if there is a topic you'd like to see in the future.
Very nice explanations, Alan. You're a natural at teaching. Thanks! Would you consider a video (or few!) about characterizing power supplies? I've found almost zero comprehensible content that explains Bode plots, gain and phase, poles and zeros, etc. A W2AEW video explaining how to do feedback loop compensation in switchers would be epic.
+FlyingShotsman The videos of Brian Douglas (ControlLectures here on youtube) are very good in explaining the basics of control systems and how to specify/use them, including bode plots, gain and phase margins, root locus plots, nyquist plots and all that stuff. Most certainly worth a look at if you are interested in feedback loops for powersupplies or feedback loops in general (they dont really change)
Brian's stuff looks great. I'll start working through it as soon as I have a chance. Thanks, +tHaH4x0r.
+FlyingShotsman Transfer functions are not restricted to electronics so an understanding of poles and zeros is isolated to mathematics. Physical interpretations of system responses are like a bridge between math and reality so you can use mechanics, electronics, hydrodynamics, thermodynamics etc whatever floats your boat to "kind of" get a glimpse of what's going on. If you are interested in control theory related to electronics, and are a beginner, I would really recommend starting with concepts of simple oscillating RLC circuits along with methods of damping them. I'm saying this because such circuits are themselfes closed loop systems that can be "compensated". Don't go directly into switchers as it will only add more fog.
I'll thumbs-up every Back to Basics video. So useful when you want to understand electronics
Fantastic refresher! I've been away from electronics projects for a while but this video actually answered some questions I had a long time ago.
I have to say that I laugh from amazement when I see how organized and diligently structured these lessons are. Master of details. Someday hopefully I will be more like this.
+swiftjeff The organization and structure to this lesson is due to several hours of noodling on various ideas, and countless notes, research, etc., to assemble just the right combination of information and narrative - followed by a few hours of shooting clips, editing and finally posting on UA-cam.
+w2aew Thanks for that insight into what goes into the videos! It provides a different perspective on the many hours I've put into projects, perhaps not as wasted as I have thought.
I loved this video, very well explained, relly professional, shows exactly what a engineer or tech needs to know in a delightful structured master class, thanks a bunch !!
You should definitely bind those notes to form a book like forrest mims :)
Need more videos on back to basics. A lot of people will be benefited Thank you for sharing :)
The ARRL should footnote and have links to many of your videos in the General and especially the Extra Class manuals. You have been such a great help to me in understanding such difficult topics as you cover. Thanks so much!!
As a newbie to electronics, I have to thank you. Learning a lot from your videos. So you have a very grateful fan! Thanks again!
You have a good way of explaining the electronic topics that you present on these videos.
Thanks so much.
I can't like your video enough. Amazing walk-through for basic FET knowledge!
My knowledge of FET transistors goes so far back, that I still think of them as "newer" devices. At the time I was of the understanding that they were much less resilient than bipolar transistors. Is it true that they are more easily damaged? You can tell I'm an old tube guy. "If the plates are red, just kill the voltage and figure out where you went wrong". My early forays into solid state devices was less than successful because they fail with no visible clue. Thanks for helping an old dog keep learning.
Its very difficult for those of us with learning disabilities to translate acronym speak on the fly. Its like running on a track trying to keep up but every other step there is a concrete block to be negotiated. Yes, I can clearly see what the acronym stands for, but I have to turn the letters into words then input it into my broken processor. Video is great and undoubtedly easy to understand for 90% of the audience.
Succinct and clear, great introduction video, thank you!
Thank you so much for taking time to make those videos. The quality of the explanations is amazing and the simple circuits that illustrate theory help a lot. Please keep up sharing your experience of analog electronics.
Incredibly clear presentation. Thank you so much for sharing your knowledge!
What a great explanation! The best I've heard yet. Detailed, concise, and very informative.
Beautifully made tutorial thank you.
It interests me as a restorer of vintage stuff to note that the Jfet biasing is just like a vaccuum tube cathode bias method.
Another great vid. Back to basics are some of my favorites! Thanks for all the hard work you put into these.
You are psychic ... I was just reading up on JFETs when you uploaded this. Good job!
Thanks! You are an excellent teacher. With your discussion of complex topics such as this, and then your hands on demonstration, I can always learn something. 73
Very good explanation. You've made it very plain and simple for electrical?electronics technicians and engineers to understand. Good job, keep it up.
fantastic as ever. in fact it was my first to see the graphs on the oscilloscope. i always sow them in the books. thanks again.
You are doing a great job ... I'm learning a lot here ... Much better then school... Carry on
@20:70 i think you mixed between when to use it as a switch and when as an amp, because we drive the device to saturation when we need it as a switch not the opposite ... you are amazing mr alan .. so happy i found you
There is an unfortunate difference between the terminology used for a bipolar transistor's saturation region and a FET's saturation region - they are opposite! For a bipolar transistor - operation as a switch (very low Vce) is the saturation region. But, for a FET, the switch operation (very low Vds) is called the linear or ohmic region. The FET's saturation region is when operating in linear/amplifier applications - the same region that a bipolar calls the active region. It is unfortunate the these two device type use the same name for different regions of operation.
en.wikipedia.org/wiki/MOSFET#/media/File:IvsV_mosfet.svg
Very nice video with very good explainations and very clear diagrams. Keep up the great work.
Super clear explanations. Love the family tree. For somebody like me still figuring out what goes for what, it saved me alot of research. Thank you. Much appreciated
Great video. This is sort of a review of the things I learned, and mostly have forgotten, from my BSEE degree back in the "dark ages" (1976). What I was trying to remember was when to use a JFET and when to use a MOSFET. Most of the videos are on MOSFET technology. 73 de AF6AS.
You make things look and make sense to all that view. pity I didn't have you as a teacher back in the day.
Cheers
Awesome... You are the best teacher... My humble request to you would be to write a basic electronics book emphasising the practical aspects of the circuits in a very lucid way as presented in your videos.
You explain all this stuff as master. Thank for your knowledge
Water theory, for electronics, is one of the best ways to teach it that I know of, and I wish that was how I learned it while at tech college. That was how the military taught it, and it's why the Europeans called vacuum tubes, valves. An FET, or transistor, really, works similar to a valve being turned on and off. Similarly, a diode acts like a check valve. It's an easy way of understanding electronics.
Ohm's Law was derived from hydraulics as well, from restriction, flow, and pressure. In the early days, voltage was called electrical pressure or tension.
Your Back to basic videos are fantastic. Thanks Alan.
Very nice video, explanation and demonstration. I really enjoy how you stay on point through all your lessons. I wish I'd have had instructors like you when I was in my engineering courses. Thanks & 73 de kb4twn
you are an amazing explainer ...i am learning from you and simulating side by side. totally new level of understanding. thank you.
Best introduction on FETs that i've seen so far. Thanks a lot!
Another great back to basic video Alan.Easy to follow, Well Done. Thumbs up.
Great instructional video with examples! Fantastic.
one of the most informative vids i seen. well at least for me, as concerning mosfet's and cb radio's in final p/a transistor flow chart applications. i hope that isn't confusing. it makes sense to me, and i had to read it several times.
Amazing video as always... One thing I'd absolutely love to see if you take a MOSFET and use it in a simple RF amplifier circuit and make a tutorial out of that. Subsequently I'd also like to see a MOSFET tutorial with an audio amplifier circuit. Pretty please, and keep up the great work.
Now I understand it!! Great illustrations and an easy-to-follow video!! Thanks for sharing!!! ☺
Thank you. I am going to have to keep coming back to this video.
Pure Gold Explanation ! Thank you !
very nice and detail explanation. Never knew the important details about mosfets and jfets
Its always very informative to watch all of your video.
Although it just an introduction to JFETs and MOSFETs its a great video. I always enjoy your videos. Nice work!!
So very clearly explained. You are a great teacher. Thank you for this great material!
razor-sharp explanation, so much appreciated
You sir, are doing God's work.
I love this simple paper and pen with practical demonstration. Btw, has anyone noticed that cute mini scope that sits on top of the function generator?
That "mini-scope' was a promotional item that accompanied the introduction of the MDO3000 oscilloscope. It's actually a USB drive...
Thanks for the very helpful explanation. I love your use of current mirror to measure the current without disturbing the main current path. I will be using this.
I see JFETs in many variable gain amp circuits and I wondered why not use MOSFETs.
After watching this video I guess JFETs have a more useful range of linear region?
Thanks again.
*Very thorough and carefully presented. Thank you - this has helped me enormously.*
So glad I found this channel...!
I have been puzzling over how mixer and multiplier circuits work. I just passed both my tech and General tests yesterday and they left me with more questions than answers. I know they're not some mysterious component, but Im not satisfied with how they work, I want to know why. Can you point me in the right directions? Thanks, this is really a great video!! I love to breadboard these simple circuits and let my grandsons play with and ask questions about then. Then I play your video and after a number of pauses I'm so pleased to see the lights come on and hear the chorus of "COOL"!!!
I have several videos on mixers. Here is a good starting point:
ua-cam.com/users/w2aewsearch?query=mixer
Nice lesson, Alan. Thanks. That stuff gets confusing sometimes.
Brilliantly explained
Brilliant video! Thank you. Excellent, logically, well paced, clear. Good work!
Superb tutorial, best online source of information. Thanks for the uploads, please keep the great work.
The best explained videos I've seen thus far on youtube, thank you so much !
Thanks for the back to basics. I forgot most of these stuff
Really great and easy explained, especially using measurement of I-V curve is very understandable!! Thanks.
We live in great times one can have such an amazing information for free at ones fingertips.
Another fantastic video with nice graphic display. Diligent preparation of the notes and the demonstration made it easy to visualize these components. I’d appreciate a video explaining how RF signals flow through these devices. I have a good idea how the AC is cleaned off the signal but am fuzzy on the relationship between current flow, source voltage and amplification of the RF signal. I think source voltage drops as I/sc increases and that causes an amplitude increase. So, taking the G/ssV lower increases the gain?
As always an excellently presented video. Thank you.
Another excellent video! Thanks for spending the time to make these. I always learn alot.
Great tutorial. I've said it before, you're an excellent teacher.
Thanks for the easy-to-follow instructions on JFET and MOSFET. I wa wondering have you covered any vlog on MESFET? I appreciate all your hard work in giving you audience a great experience watching your video.
I haven't done a video on MESFET. However, functionally it is very similar to a JFET, except that the diode at the Gate is a schottky diode, not a PN junction like the JFET. Otherwise, operation is virtually the same as a JFET.
Wow! What a great overview of something that always makes my head hurt trying to remember which is which and why! 73 - Dino KL0S
+Dino Papas Thanks Dino - I'm glad you found it useful. Did you notice that I did a little minor formatting on the subject-wise section of the video index file?
Great introduction to FET, Thank you!
Thank you for these videos! You're golden.
Greatly informative video! Also great for review since it's been a while haha. Cant wait for the next one.
Good subject, good knowledge, no waffle, subscribed
The best electronics tutorial video. Thank you for sharing.