Non-inverting op-amp circuit 

over 40 years in electronics and this is best explanation of op-amp that a beginner needs...

I appreciate that you are teaching well prepared and fully illustrated lectures, and I am thanking you for that. I suggest that you establish an independent course for Analogue Electronics. Best regards.

Thank you for posting such a good lecture on non-inverting opamps.

My god I've found the channel that can teach me this stuff. Everything was frustrating me and this is perfect

Great video, I couldn't understand half of what my lecturer was trying to get across with their explanation of op-amps but this has really helped

Much better than any of the explanations my professor has given

Great tutorials. I think one of the best source around. Could you please release some tutorial about Oscillators - wave shapers - schmitt's trigger?

This is an excellent video. Thanks for the effort :)

FINALLY! someone that explains really how an op amp is modeled and how to get to the gain formula

Thank you !! Best explantation i found on the internet:)

Amazing explanation Sir. Thanks a lot!

Thanks a lot for your clear explanation!

Before you started doing anything, I tried to see if I could come up with how to set the gain myself. And I came up with Gain=R1/R2+1, which is equal to R1+R2/R2. I also did it by simple ratios of the resistors, but added the 1 because the gain value is greater than the ratio of the resistors by 1. A gain of 1 would just be a voltage follower, while a gain of 2 doubles the voltage. So a ratio of 1 would be a gain of 2 because it halves the output voltage, while the voltages on both inputs must be the same, therefore, the voltage on the output must be double that of the input so as to make the halved output voltage equal the input voltage.

Love Your Videos Sir, Always prefer khan academy videos first . A big fan!

I'm visually oriented but this time the math made more sense to me. I haven't seen another basic op amp video that derives the formulas this way 9for beginners) Nice!

tysm u just fixed my nightmare, cant thank u enough!

You make life easy. Thank you very much 😁😁😁

Since we are using ideal op-amps, we know that V+ = V-. The fastest way to get to the answer given, is to use the voltage divider and this property. V+ = V_in V- = (R2 / (R1 + R2)) * V_0 By the V+ = V- property, we get: V_in = (R2 / (R2 + R1)) * V_0 Getting V_0 as the lone term: V_0 = V_in * (R1 + R2) / R2.

Thanks, explanation super clear.

Thanks pal this helped me a lot! :)

great job khan academy

Thanx alot....explained well😊😍

awesome explaination

Very nice video!

Your videos can easily replace the best electrical engineering textbooks when it comes to teaching fundamentals.

Wow you are a genius. I am cracking my head with both difference arrangement of formula one is (voltage divider rule menthol) one is (KCL law to solve the equation) then suddenly u make the voltage crystal clear at the point you explain dependent (not really sure wat it means at first but you mention voltage divider rule!! Bingo !!! i got what you mean!!! thousand thanks

how do you know which resistor to put on top using the voltage divider? (Why R2 instead of R1 in the numerator?)

I would to have a video with the digital circuits of opamp please

thank you sir.

Thank you very much

how does v+ become vin later in the equation

There's a way to contact the professor? Great work!

op-amps are still cool... thanks..:)

what about ideal non-inverting? would they just be 0 since v- and v+ seem to be important here

why can’t I have teachers that explain like this at school?

Amazing

Awesome

@7.42 v+ is vin but there is resister so no voltage drop ?

Vin comes twice? one that is supplied as V+ and the other one as difeerence of V+ and V- . Whats the differnce ?

Why do we substitute V+ with Vin.

in the previous video you said that Vin= V+ - V- so why here Vin = V+ ??

Please give details about inverting and non inverting operational amplifiers in details

Thanks, had a good understanding from lectures but this blows most explanations out the water.

How come you changed v+ to vin?

Why is v+ substituted for v-in at 7:46 of the video

I am a first timer at opamps and was trying to get the non inverting amplifier to work. I connected V+ to +5v and V- to gnd( since I will be using it for DC). I am continuously getting a high output voltage of 4.44v. I even tried the offset null circuit but the output voltage remains constant at 4.44v. The feedback resistor is 1Mohm and R1 is 100kohm. Can anyone guide me here as to what could be going wrong? Is the negative power supply absolutely necessary for the opamp to work?

Why is he able to say (R1+R2)/R2 is 2? That would only work if they have the same values of resistance right?

I don't get how gain A can be "really, really big (10⁶)" and at the same time only the ratio of the resistors, which normally isn't a very big number. Can someone please explain this?

can someone tell me why gain will be a very very big number?

How did he get 1

Sir, How did you the equation that v- =v°R2/R1+ R2 ?

Why it is V- = Vo * ( R2/(R1+R2), not V- = Vo * ( R1/(R1+R2))?

What if there's a resistor between the voltage source and V+? How would the equations change, then?

What is the use of R2 here

If V- = Vo * ( R2/(R1+R2)), shouldn't Vo = V- * ((R1+R2)/R2) ?

I dont understand how you can have i+ = i- = 0 you put a voltage/signal?

i have a huge question to ask which is bugging me, according to the first equation Vnot = A(V+ - V-), later it was said that V+ = Vinput . again in the last equation it was said Vnot= [(R1+R2) / R2]*Vinput. according to that if we compare the two equations A= [(R1+R2)/R2] . @?!@!@ can someone please explain what im missing. it would be much appreciated if you can help.

sir can we consider (r1+r2)/r2 as total gain=A+(r1+r2)/r2

not=ex) I'm not a US citizen. Variable in electrical engineering is naught...

it would be more elegant if you just divied the whole expression at 9:49 with a, then it would be 1/A and that is more logical to be able to just leave out

I was with you till about 6:20 and I have no idea where and how you manipulated the equation.

wtf

Can anyone test this out and give feedback? Search: 'Circuit Solver' on Google Play.

explanation is not so good check out Michel Van Biezen much better

Can the narrator PLEASE do something where I don't have to hear all the saliva in his mouth? Every flick of the tongue and smack of the lips? It's disgusting.