Today we examine question #22 from Jim Williams’ Test Your Analog Design IQ: How to get -20V out of an LM741 op-amp running from a +-15V supply?
Пікірлер: 61
@pratikahir1484 жыл бұрын
These kinda videos can be so resourceful!!!!
@ohmedarick16 жыл бұрын
Excellent video. I enjoyed watching over and over. Thank you... Keep them coming.
@mannesq5 жыл бұрын
Great video at a perfect pace. Please make some more!
@drulli17 жыл бұрын
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..
@jimadams24738 жыл бұрын
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.
@DineshKumar-wv1uq2 жыл бұрын
Great explanations. Thanks much!
@BharathKumar-kx4kt3 жыл бұрын
Thanks for the nice explanation, waiting for more videos
@sachingoud60645 жыл бұрын
Amazing approach
@GenericPurpleTurtle7 жыл бұрын
Terrific video, and thanks for the book recommendation, keep up the good work :)
@tarunvarma33232 жыл бұрын
Great. Please make more
@christopherzhu31613 жыл бұрын
This is great!wish my teacher had taught this way
@ARBB1 Жыл бұрын
Great work.
@CurtWelch2 жыл бұрын
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!
@RexxSchneider2 жыл бұрын
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.
@MegaMino314 жыл бұрын
Please continue this video series
@rakka1dude1846 жыл бұрын
the voltage divider is a beautiful trick, nearly understood it then.
@ahmedgaafar53694 жыл бұрын
very interesting ...thanks buddy.
@onbeat0899 жыл бұрын
Fantastic video. Thanks for sharing. Looking forward to more of these videos hopefully!
@Analogzoo9 жыл бұрын
David H Definitely! I'm planning on doing one of these every week or two.
@efox299 жыл бұрын
+devttys0 Every week!
@catalin34078 жыл бұрын
Every day ! ... Just joking. Keep doing it when you are able to !
@t1d1002 жыл бұрын
Thanks! I vote for more tutorials like this! Does anybody have a link to where to download the book?
@bertvanleeuwen66969 жыл бұрын
Fascinating
@nnilson20035 жыл бұрын
excelente!!!!
@alimovahedi65216 жыл бұрын
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?
@Analogzoo6 жыл бұрын
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.
@paugasolina50482 жыл бұрын
i luh that book cuh
@ivolol Жыл бұрын
Why not use two 5V zeners to roughly equate a 10V one?
@aniketsaha74555 жыл бұрын
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...
@simangundeep87703 жыл бұрын
Anyone know, where do I can get that book?
@shawnmicheals18658 жыл бұрын
gr8 video! pls share some more info on op~amp as converters.
@Analogzoo8 жыл бұрын
+Shawn Micheals I'll add it to the list! :)
@SebastianScholle3 жыл бұрын
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?
@fakeapplestore47104 жыл бұрын
what oscilloscope do you have?
@ravishrestha38852 жыл бұрын
Where can we find copy if this test book?
@Giovanni28624 жыл бұрын
Where I can buy this book?
@carrizzle95862 жыл бұрын
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.
@doctorbobstone Жыл бұрын
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).
@UjjwalKumar-gl3rr4 жыл бұрын
💚
@Inquire985 жыл бұрын
"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 😎😐😎
@user-ww2lc1yo9c7 жыл бұрын
I love you
@twobob4 жыл бұрын
Lies, not plenty more :) Great vid
@99354030173 жыл бұрын
4:50 what's the role of -25 volts?
@yonatanarieh97702 жыл бұрын
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.
@AdityaMehendale6 жыл бұрын
A BJT/FET is (ironically) a lot cheaper than a 10V zener today :-/
@va77782 жыл бұрын
1:18 I wanna hear the context of question #21 part d) !!!
@va77782 жыл бұрын
4:37 the answer makes me even more curious!
@charlieangkor86494 жыл бұрын
there are transistors inside the 741. He said use no transistors.
@charlieangkor86494 жыл бұрын
what if we create random circuits, and then analyze what they do?
@paulperry70912 жыл бұрын
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.
@bradleyr44512 жыл бұрын
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.
@trevorvanbremen47183 жыл бұрын
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)
@somedutchguy75823 жыл бұрын
While it is undoubtably the most stable zener commercially available, it is still not very accurate at about +4/-3%
@ivolol Жыл бұрын
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.
@davidluther39555 жыл бұрын
I NOT SURE OF WHAT THE OF POINT OF THIS CIRCUIT IS.
@Impedancenetwork2 жыл бұрын
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.
@marka19862 жыл бұрын
They got the job done.
@paulperry70912 жыл бұрын
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.