Fun puzzle! I paused the video and worked on the puzzle. Took me a few hours with multiple false starts, but I got the exact same answer he gave in the end! Also, instead of a 10V zener, you can use a stack of about 14 silicon diodes to perform the same trick by creating a combined 10V forward voltage drop!
For voltages more than a few diode drops, it's far easier to use an "amplified diode", which is a high-β transistor with a resistor R1 from collector to base and a resistor R2 from base to emitter. The collector-emitter will start to conduct when the voltage across it reaches approximately (1 + R1/R2) * 0.65 volts. For example, to simulate a 10V zener that has to pass up to 15mA, you might use a BC547C with R1=39K and R2=2.7K.
Excellent video. I very much like your the detailed explanations of the underlaying electronic principles. Thank for investing your time. Looking forward for more videos..
Very good instructional videos. And the book by Jim Williams is awesome, too. i like your pace and delivery. Very clear and organized. Best description of a zener diode I have seen!!!! Thanks. Keep the great work.
You need a very negative supply such that current will always be flowing in the direction that will reverse bias the zenner. A -25 V supply is less than the minimum output (-20V) and will make sure that current will always flow in the direction that will reverse bias the zenner even when the output swings to its lowest point.
Was your 1st circuit wrong???because for an op amp output should be within the supply voltage of op amp(saturation voltage)...otherwise op amp will work as comparator...
What do you even call this circuit? I was looking for this exact circuit. I have a +-24volt supply available. But my opamp only handles +-18v. And I wanted to invert a - 24volt signal to a +24volt signal. Not sure it can be done... Got any advice?
Thanks for a good Video. I did try the above circuit by LT Spice the output did sewing from 6.4V to 13.6V rather than 0 to 20V. I did change the 0.1uF by 1uF then the output did sewing from 0 to 20V. Why please?
I don't know what frequency your input signal was configured to be in LTSpice, but if changing the coupling capacitor affected the voltage swing, I would suspect it has something to do with the impedance of the capacitor at your selected operating frequency.
We can, but they very rarely do anything interesting or useful. I know this, because (by omitting components or accidentally using incorrect valued components) I have created many random circuits over the years! On the other hand, it is possible to evolve a useful circuit by using artificial evolution, combining and testing random assortments until you get the result you want. This method also used in antenna designs.
I love the comment around 8:10 ish... "Zener diodes aren't known for being very accurate" I'm guessing nobody told that to Linear Technology when they invented the LTZ1000A with it's temperature controlled buried zener? (Before y'all scream at me... Yes, I _DO_ know that's a VERY special case scenario)
Zener diodes in fact are quite accurate, but as they are current-mode devices, you need to provide them a stable set current to get that stability, rather than any particular voltage.
Good god ole'mighty throw that piece of shit Klein meter in the trash. And throw that crappy yellow no-name meter away. Man it makes my eyes hurt to look at shitty test equipment.
Fun puzzle! I paused the video and worked on the puzzle. Took me a few hours with multiple false starts, but I got the exact same answer he gave in the end! Also, instead of a 10V zener, you can use a stack of about 14 silicon diodes to perform the same trick by creating a combined 10V forward voltage drop!
For voltages more than a few diode drops, it's far easier to use an "amplified diode", which is a high-β transistor with a resistor R1 from collector to base and a resistor R2 from base to emitter. The collector-emitter will start to conduct when the voltage across it reaches approximately (1 + R1/R2) * 0.65 volts. For example, to simulate a 10V zener that has to pass up to 15mA, you might use a BC547C with R1=39K and R2=2.7K.
These kinda videos can be so resourceful!!!!
Excellent video. I very much like your the detailed explanations of the underlaying electronic principles. Thank for investing your time. Looking forward for more videos..
Excellent video. I enjoyed watching over and over. Thank you... Keep them coming.
Very good instructional videos. And the book by Jim Williams is awesome, too. i like your pace and delivery. Very clear and organized. Best description of a zener diode I have seen!!!! Thanks. Keep the great work.
Fantastic video. Thanks for sharing. Looking forward to more of these videos hopefully!
David H Definitely! I'm planning on doing one of these every week or two.
+devttys0 Every week!
Every day ! ... Just joking. Keep doing it when you are able to !
Great video at a perfect pace. Please make some more!
Great explanations. Thanks much!
Amazing approach
This is great!wish my teacher had taught this way
Thanks for the nice explanation, waiting for more videos
the voltage divider is a beautiful trick, nearly understood it then.
Please continue this video series
Great. Please make more
Thanks! I vote for more tutorials like this! Does anybody have a link to where to download the book?
Great work.
Terrific video, and thanks for the book recommendation, keep up the good work :)
Fascinating
very interesting ...thanks buddy.
i luh that book cuh
Why not use two 5V zeners to roughly equate a 10V one?
gr8 video! pls share some more info on op~amp as converters.
+Shawn Micheals I'll add it to the list! :)
"Thank You", thank you very much 😎 How can I get a copy of the book. Let me know. I look forward to hearing from you 😎😐😎
excelente!!!!
A BJT/FET is (ironically) a lot cheaper than a 10V zener today :-/
4:50 what's the role of -25 volts?
You need a very negative supply such that current will always be flowing in the direction that will reverse bias the zenner. A -25 V supply is less than the minimum output (-20V) and will make sure that current will always flow in the direction that will reverse bias the zenner even when the output swings to its lowest point.
Was your 1st circuit wrong???because for an op amp output should be within the supply voltage of op amp(saturation voltage)...otherwise op amp will work as comparator...
Did anybody see what voltage he was using for the op amp for the zener diode circuit? Is it +/- 15V or -25 to 0V it wasn't explained.
It was a condition of the problem that the opamp use +15 V and -15 V. He also showed it in his first schematic (around 2:03).
1:18 I wanna hear the context of question #21 part d) !!!
4:37 the answer makes me even more curious!
there are transistors inside the 741. He said use no transistors.
2:00 output a larger voltage than the supply voltage? supply is 30v, need to output 20v? output larger -v swing than the -v rail? sure.
What do you even call this circuit? I was looking for this exact circuit. I have a +-24volt supply available. But my opamp only handles +-18v. And I wanted to invert a - 24volt signal to a +24volt signal. Not sure it can be done... Got any advice?
Where can we find copy if this test book?
Thanks for a good Video. I did try the above circuit by LT Spice the output did sewing from 6.4V to 13.6V rather than 0 to 20V. I did change the 0.1uF by 1uF then the output did sewing from 0 to 20V. Why please?
I don't know what frequency your input signal was configured to be in LTSpice, but if changing the coupling capacitor affected the voltage swing, I would suspect it has something to do with the impedance of the capacitor at your selected operating frequency.
Anyone know, where do I can get that book?
what oscilloscope do you have?
Where I can buy this book?
Lies, not plenty more :) Great vid
what if we create random circuits, and then analyze what they do?
We can, but they very rarely do anything interesting or useful. I know this, because (by omitting components or accidentally using incorrect valued components) I have created many random circuits over the years!
On the other hand, it is possible to evolve a useful circuit by using artificial evolution, combining and testing random assortments until you get the result you want. This method also used in antenna designs.
I love the comment around 8:10 ish...
"Zener diodes aren't known for being very accurate"
I'm guessing nobody told that to Linear Technology when they invented the LTZ1000A with it's temperature controlled buried zener?
(Before y'all scream at me... Yes, I _DO_ know that's a VERY special case scenario)
While it is undoubtably the most stable zener commercially available, it is still not very accurate at about +4/-3%
Zener diodes in fact are quite accurate, but as they are current-mode devices, you need to provide them a stable set current to get that stability, rather than any particular voltage.
💚
I love you
I NOT SURE OF WHAT THE OF POINT OF THIS CIRCUIT IS.
Good god ole'mighty throw that piece of shit Klein meter in the trash. And throw that crappy yellow no-name meter away. Man it makes my eyes hurt to look at shitty test equipment.
They got the job done.
Do you pick up the groceries in the lambo? A couple of good, and plenty of "shitty" meters on my bench. Just know which to use, when.
why smack your lips though...