#289
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- เผยแพร่เมื่อ 22 พ.ค. 2024
- The basic characteristics of a Zener diode are presented and demonstrated on the bench. The subtle difference between true Zener diodes and Avalanche diodes is presented and demonstrated on a curve tracer. The notes from this video are here:
www.qsl.net/w/w2aew//youtube/B... - วิทยาศาสตร์และเทคโนโลยี
Very much appreciate you taking the time to show a demonstration rather than simulations and drawings.
I never knew that "zener" diodes above 5V were actually avalanche. So interesting. Thanks for the video!
Thanks Ben - I always feel honored when I can teach *you* something!
To share a comment string with you two gentlemen is something I could not pass up. Thank you both for making the most exceptionally educational videos on the Internet.
Thank you for being a loyal viewer!
Nice breakfast ✅ detailed zener explorations ✅ good start of the day!
Al, you are a really good teacher. Info is simple and easy to understand. All your videos and great but I especially like your back to basic and circuit fun videos. Thank you.
73, Christian, VE2MW
I’ve been catching up on your nearly 300 videos. I must say what a tremendous pleasure it is to watch a consummate professional with superb teaching skills. I so appreciate your concise, organized, brilliantly presented lessons, focused on the topic without distraction or drama. When I go sit down with my antique Tek equipment to enact your examples, I feel like I’ve been working there. This was never my field, but I’ve learned more theory and fundamentals-with clear understanding-in two weeks than I did in 40 years of dabbling. From one Alan E to another, you have my gratitude. Many thanks.
Thanks again AEW. For me, not being technically educated, your explanations are very clear and to the point. I keep all your info printed on my desk and work with it. Keeps me going in the hobby on my age.
WOW. I miss these back to basics video topics. I never knew there were zeners and avalanche (zener) diodes. You ALWAYS teach something that is not generally taught in regular electronics courses or general articles. I guess I need to buy some good components from Digikey and test this myself. The chinesium devices are OK but that avalanche knee is incredible and a very desirable effect. I had no idea. THANK YOU MAESTRO.
Now I know why i have seen zeners in series as a reference in older schematics they are trying to cancel the opposite temperature Coefficient for a more stable reference... love your vids Allan one of the best channels on yt.. your knowledge and aptitude for passing it on is really commendable.. you take the time to pass on with no real reward other than the knowledge you have helped others.. our society grows great thanks to folk of your calibre Thank you so much
Could not have been explained any better. Excellent.
This is the best tutorial on Zener Diodes I have ever seen.
Was going to rate it 10 out of 10 then I saw you included the notes as a PDF.
So now it is 11 out of 10. Thanks so much for the perfect demonstration.
Simple like electronics in stereo amplifier building as a hobby never really get good enough to get beyond the basics so it’s always good to refresh and keep watching new basics videos that explain a device in a different way for a broader understanding of the knowledge needed for that specific applications. Thank you keep the basic videos coming.
Who knew you could almost base an entire physics career on diode design, application and theory.
As you implied, the temperature stability depends on the break through voltage.
The 5.2V Diodes are very stable as they tend to have a combined coefficient of zero.
I just discovered your channel few days ago, looking how to re-calibrate an old Tek 465 I purchased from eBay. I had this scope on my bench at work, in Romania, from 1988 to 1995, a great scope. You're a very talented teacher. Thank you for everything you do. Myself been a HAM since 1985, 73s Catalin YO3FCU.
Excellent, as always. Your explanations, diagrams and practical demonstrations make this crystal clear. This is the best coverage of Zener diodes I’ve seen. Well done, and thank you!
Outstanding vid and teaching. Zener diodes are often used in the design of Intrinsic Safety, where a circuit has to be used in a Hazardous location and the voltage MUST be controlled to never go beyond a certain amount.
I watch as many electronic chanels as I can but you Alan are the number ONE, Thanks so much👍👍👍
Great video....!! Having been an electrical engineer for the past 30 years, it is still so wonderful to find someone who can teach the basics in a way that interests all levels simultaneously. Just fantastic work indeed.! Having found my way here from Hack-A-Day(best website ever..!).....I am blessed to see this is tutorial #289.....meaning I have found a new source for lunchtime instruction.....Great Job....looking forward to video #500.
Thanks. I hope you enjoy the rest of my videos just as much.
Alan, When you published your step voltage generator video I knew a curve tracer was next. If i recall our email exchange correctly you mentioned you did not have a commercial curve tracer. So congratulations on the 576 acquisition, Once again, if i remember the conversation correctly. None-the-less, great video lesson. Having the right instructor with the right equipment to demonstrate the subject is priceless. 73, Paul, W1SEX
Yes, I was lucky to get this one earlier this summer - only needed a few small repairs.
Big love to my teacher for showing me this channel, these videos are really helpful, thanks ^^
Very nice! I wonder where you're going to school (i.e. what teachers are sharing my channel?)
@@w2aew Yeditepe University in Turkey, Introduction to Electronics course. He put your "Op Amp Power Supply Considerations" video as a tutorial for the Virtual Ground concept in one of our lab papers and i decided to check out more videos :P
@@Lunamana That is great! So happy to hear that my videos are helping the next generation of engineers!
Great to see a working 576 in action!
I’m in love with that Curve Tracer! That Vert/Div, Horiz/Div display 😍
Super interesting video! Thanks for this!
The numbers are from an array of fiber optic cables running back to an array of incandescent bulbs!
Again, the best explanation I have ever had. Thank you
Aha! So the balancing of the positive and negative temperature coefficients is what's used to make the temperature-stable Zener that you use as a voltage reference in your 50 microamp current source, handy for calibrating Simpson 260's! Love it!
Excellent, again! Love the way you combine theory and practical demonstrations.
Really appreciate your lessons along with the actual event happening visually!
Love these videos and the use of the curve tracer. Nobody is using them on TH-cam. Kudos to you. Please show them more often. It would be cool to have you do a troubleshooting basics series of videos. With your logic and fundamentals approach to teaching I thinking that kind of series by you would really stand out.
I'll be doing more with the curve tracer.
Yes I would love to see some troubleshooting with a curve tracer.
Excellent work Alan, thanks, simple, clear explanation with quality practical demo.... Perfect combination....
I have an undergrad in EE and I often learn a little something from your back to basic videos. You always do such a good job with these type videos, if you are not careful people might start to think that you are a nice guy :o) Thanks for sharing and keep out the good work. 73
Oh that probe compensation screwdriver is just golden :) Great video Alan! Thank you and keep it up!
you know how to make a complicated subject easy to understand. love watching your videos as they take me back to the basics. 73, ad0am
Your videos are always excellent, well explained all around.
Thanks a lot!
Please keep on coming. These back to the basics are a great idea. I'll try not to miss any of them.
Great video Alan. Good use for your new curve tracer too.
That curve tracer, what a beautiful piece of equipment, and the old Tektronix logo are lovely. Looks like someone really took good care of that unit. Great video as always, thanks.
Excellent video. I learn something new with every of your videos.. Thank you.
I always look forward to another edition of your Back To Basics lessons.
Thanks Alan,
Dave
Out of the regular, cheap Zener diodes, the ones that have the lowest temperature coefficient are those rated for 5.6V. In them, the contribution of both effects (Zener and avalanche) is more or less balanced and the temperature coefficients largely cancel each other. So if you need the most temperature-stable Zener diode as a reference and don't want to pay for special parts, a 5.6V one is your best bet.
That's a bit of sage tribal knowledge, thank you!
Thank you for doing these videos you are an excellent teacher! Explained in a clear and concise manner.
Thanks again for another really great video, Alan. I always learn a lot from your videos. Greetings again from Melbourne, Australia.
Once again! .....simply yet elegant video Alan !!!...... Love that Curve Tracer of yours :)
Me too! I'm very lucky to have it
Thanks Alan. Love your videos. You are a great teacher!
Nice video! You have a very easy to follow/understand teaching style.
Thanks for sharing some of your knowledge with us. 👍🏼
Excellent lesson, well explained. I cans also see you have mastered the tablet!! Thanks Alan
Alan, excellent presentation as usual! I had long forgotten about the term avalanche diode and the difference between true zener and avalanche diode. Thanks for knocking off some of the cobwebs in my old brain. I truly enjoy your videos.
this little difference is never shown on books i read, thanx!
I always learn something from your videos. Diodes were always a mystery to me but now....wow, eyes opened. Thank you Alan. 73 de N0BPS
Thanks for the great tutorial Alan.
You do this so well and are a pleasure to listen to.
thanks alan for back to basics. I love it
Really excellent video - your drawings made it so clear - I didn't realize there was a difference between the types of the generic name of 'zener diode'.
Sums up Zener in all aspects. Enjoyed it,
Nice lesson Alan, thanks!
Thanks for this nice video. TVS diodes are just a fancy name for an avalanche diode.
fantastic video
Very helpful. ANd a wonderfully clear explanation.
Thanks. Your videos helped in experimental understanding.
Zener sounds like Zehner in german. And Zehner contains Zehn = ten. So, our trainer always said: design Z-Diode bias resistors, that at least 10mA current runs through the diode ;)
Handy tip!
Kudos for the diplomatic pronunciation correction :D
Excellent video sir! This is a very insightful video about the zener diode. With the illustrations on the curve tracer made it even more clear. Thank you very much for this lesson. I like your videos a lot, you are an excellent teacher.
U teach like a pro please keep up this work for our sake
Now I know how they work :)
Be great to see a voltage regulator circuit with a Zener in it.
Excellent explanation of the zener diode thank you very much
That's some great educational material.
I love your videos, you do such a great job at presenting the information.
Peace and blessings 🙌
Thanks for the tutorial 😀
I like your headings on the notebook with a kind of meteor underline--I've never noticed that before... anyway a great video as always!!
That was a new little bit of flair... ;-)
What a presentation! Thanks :)
Holy breakdown Batman that was an absolutely fantastic video
Deeply appreciate you sharing your knowledge. You have a talent for explanation, also excellent hand drawings. Next time you think to yourself 'shall I make a video?' i want you to know how much this was appreciated. Well edited, too; no fat on the bone, but decently comprehensive
Great review Alan...having the curve tracer for display really drives the point home. 73 - Dino KL0S
Thanks! I plan to do a lot more with the curve tracer. It's really surprising how different a switching diode looks from a schottky diode, from a Ge diode, etc. Plus, makes transistor matching a lot more comprehensive.
great video, great explanation. thank you!
Thanks Alan, as usual!
Hello Allen. My condolences for your loss of your father. Great video again.I have learned from watching it (Avalach effect, heavy /light doping). A nice follow up to this video could be the "variable voltage Zener diode" ( Zener conected to non inv. input op-amp with neg. feedback of 2 voltage divider resistors connected to the inv. input ) which is met in countless circuits as the LM431.
As always a great video
Great video as always
Needs temperature compensated references described also. 1N82X series comes to mind.
Nice 576 and good video. Thanks Alan.
Very well done. Thank you.
Nice demonstration.
Love your work!
thanks for the video. very well explained! no questions remain to be asked :) now please do a part 2 on how to use voltage reference circuits using cheap npn bjt/mosfet using zerner or other techniques. thank you very much!
Useful video
Thank you Sir. Terrific keep it up.
I always wondered why would anyone use a voltage divider and a zener diode instead of just a zener diode for voltage reference. Now i know! Very good video, thanks!
Thank you so much!
Thanks for share.
73 PU2SRZ - Sao Paulo - Brasil
Nice lesson once again, especially about the avalanche process. My experience with "standard" zener diodes that they typically have a wide zener voltage tolerance, maybe even +/-10%. What I have noticed on your curve tracer that the forward part (first quadrant) also have a very steep (90 deg) curve, as in a lot of theory books that draw more a 45 deg curve. The 90 deg is more realistic as we know that a forward biased diode has a very little resistance and that the current would indeed sky rocket 🙂
The "steepness" of the curve also depends on the horizontal scale used.
@@w2aew of course, but most of the time (zener graph) we see both quadrants (1st en 3rd), and the 3rd (reverse) is always very steep, but the 1st (forward) most of the time (not always though) under an angle of 45 Deg. The horizontal scale used is then the same for both quadrants (I suppose).
...but nevertheless very good short (remedial) lessons 👍
amazing as usual
keep forward please
Excellent video as always. Can you please expand on this topic and provide an example of how these would be used as a voltage clamp to protect equipment from over voltage? Thank you!
Another great video! I wonder about the capacitance characteristics between the two types and also under various biasing situations. I know that you already did a varactor diode video.
Excellent!
More back to basics please.
I think the most stable zeners are 5.6V and 6.2V (sometimes 6.8V if there is some additional circuitry or another diode in connected reverse for better temperature compensation). They have the smallest impedance in datasheets.
Hi Alan, you could have shown the temperature co-efficient impact on the IV curve by heating up and cooling down the diodes.
Thanks Alan,next please show us how to make a random noise generator out of them!
nice review
Awesome...cheers.
Good video.
whoa... synchronicity
I had just bought a couple of zeners a week ago or so but they didn't work as I expected so I put them away till better times
now I know what my mistake was (too large series resistor)
i'm hoping to use some zeners in a tube amp project I'm working on.. I have a microcontroller with a 10bit 8 channel ADC attached to it, and I'm hoping to use a bunch of voltage dividers so I can monitor a bunch of voltages (and currents, by extension) on the B+ line and cathodes and so on. The idea is to divide the 400v and other signals down to 0-5v, and then use a zener on each ADC channel to clamp the voltage so just in case the voltages creep over where they're supposed to, I don't end up putting 6 or 7v into the 5v inputs.
Great video but another use of zener diode you see is uC GPIO pin protection. That case appears to be different. In that case you want minimum current into GPIO but clamp the voltage. Any time I've tried that circuit arrangement the Zener Voltage is not the clamping voltage. 3v3 might be low as a clamping voltage
Cool video...now I wanna buy a curve tracer and just play with my diodes i have lying around. 😁😁
bkrgls If you have a 2-channel scope with XY mode you can build a basic curve tracer. Look up IV curve tracer or octopus curve tracer circuits
epakai
Hey thanks for that piece of information. I'll look it up. 👍
In fact Alan covered this very topic!
th-cam.com/video/WWY-pakm_OM/w-d-xo.html