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작성자레이 조회 1회 작성일 2021-11-25 13:58:14 댓글 0

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EEVblog #600 - OpAmps Tutorial - What is an Operational Amplifier?

The most often requested video! In this tutorial Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configurations are also explained.
Then a practical breadboard circuit to demonstrate a virtual ground and the effect of voltage rail limitations.
All EEVblog Opamp related videos are here:
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Regal_7 : I know this will probably get lost in the comments but I have to say it. I absolutely have a high respect for people like you who share knowledge so freely and willingly. People like you are a godsend. Thank you sincerely.
Mikael Mørup : Six years later, this is still the best and most understandable intro to Op Amps ever.
Mark Jay : "The gain is almost infinite"

spoken like a true engineer!
Mirko Mueller : what makes you a gorgeous teacher is that you not only talk about what is going on but also about what the follower might think is going on but actually is not and why. i had so many frustrating experiences in the past because of teachers that did'nt care about that. i truly love your lessons.
kevin jad : In my whole electronics major shit , I have never seen a person who explains virtual ground like this.
#RESPECT

How OpAmps Work - The Learning Circuit

In this video, Karen presents and introduction of op-amps how various ways they can be used in circuits. At a basic level, op-amps are quite simple. They compare the voltages at their two outputs and use the difference in voltages to determine how the signal is amplified. The differential voltage at the inputs often needs to only be a few microvolts to generate an amplified signal. To be able to finely control the gain, a feedback loop must be created between the op amp’s output and one of the inputs. This loop usually contains a resistor and/or capacitor to have finer control of the gain. Check out this Intro to Op Amps episode to learn more about how op-amp works and a variety of its applications: http://bit.ly/3csQDmT


Engage with the element14 presents team on the element14 Community - suggest builds, find project files and behind the scenes video: http://bit.ly/2MFMG0v

Visit the element14 Community for more great activities and free hardware:

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OPA111AM : Great to the point video, clean slides, a lot of information per time! However, there are two mistakes in the differential amp slide (around 6:20); 
1) The two inputs are interchanged. For non saturated operation (i.e. no comparator) the feedback path must always be closed, i.e., inverting input must be connected in any way to the output, 
2) The two inputs must not be tied together. As you explain, the opamp amplifies the voltage difference between both inputs and does everything at its output to keep the voltage difference at the inputs as small as possible. So, a short circuit between the inputs makes it impossible for the opamp to work.
Keep on with your good work!
Jonathan Levin : Thank you for actually explaining the mechanisms as well as elaborating a bit on the basic terms :)
Most videos just show some footage and throw formulas in your face, it feels like those are made for people who already know the material.
goose : Probably the best explanation of op-amps I've seen so far. Thanks!
Antonia Lopez : Holy thank you for explaining it this way, no other relatively short video explains where the voltage goes to depending on the input, just that it amplifies one signal or flips another.
Prof. Leandro Couto : 16 years ago, When I had this class in College I DID think OpAmps appeared to generate power out of nothing (after seeing a dozen OpAmp circuits ommiting the external power supply it's easy to forget them), and I remember not being the only one of my classmates confused, so I appreciate the comment near the end!

Operational Amplifiers - Inverting & Non Inverting Op-Amps

This electronics video tutorial provides a basic introduction into operational amplifiers. it includes examples such as inverting and non-inverting op amps. It explains how to calculate the closed loop voltage gain of such amplifiers as well as the output signal voltage.

741 Op Amp: https://amzn.to/3AXe6sN

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Moonman : You have helped me in pretty much every course at this point..
Adrian Drew : You know you're in trouble when this guy can't make you understand the concept..
Zaconitas92 : You deserve all of my tuition. You alone taught me Organic chemistry, Calculus, Physics, and now circuit analysis. These universities are next to worthless, I am sorry I cant support your videos more (financially). Half or my professors couldn`t even solve the problems they assigned when I went to their office hours.
Tom : For years now, every time I watch one of your videos, a complex topic becomes accessible. You are one of the great teachers of our time. Wondrous!
Isnaini Ahmadi : Your channel is Organic Chemistry Tutor, but I'm an electronics student and learn regularly from you.
You explain better than my electronics lecturer.

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