Inverting and Non-inverting Amplifiers - Op-amps | Basic Circuits #13
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- Опубліковано 8 лип 2024
- Operational amplifiers (op-amps) as amplifiers seems straightforward, and it is! In this video, we cover both the inverting and non-inverting amplifier configurations of an operational amplifier, derive where the amplification factors come from, and do a practical example of a non-inverting operational amplifier circuit. Op-amps are incredibly powerful tools and this is one of the many ways they can be used - creating simple yet effective amplifiers.
Parts of the video:
0:00 Introduction
0:28 Inputs to an op-amp
2:43 Inverting op-amp configuration
3:41 Derive the inverting op-amp amplification factor
6:21 Practical outputs of an inverting op-amp
7:26 Non-inverting op-amp configuration
9:03 Derive the inverting op-amp amplification factor
11:57 Practical non-inverting op-amp setup
14:58 Summary
16:02 The toast will never pop up
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I always had trouble remembering which one (+ or -) was the inverting input. Then I started thinking of it as maths ideals. When you multiply something by a (-) number, it inverts the sign, therefore the (-) input is inverting.
Showing actual setup helped me a lot to accept the purpose of using op amp !
Awesome, glad it was helpful!
i only started to understand opamps when i started following this channel.
nice work and thank you so much
Happy to help!
the greatness of your videos is that they explain the purpose of the op amps
not just math and configurations
thank you sir
greeting from so far from syria
One important thing to note... is that if the feedback loop is connected to the non-inverting terminal, these equations will still give you the exact same values, but that will not be the actual result. Feedback loop MUST be connected to inverting terminal for these equations.
this man will singlehandedly be responsible for my degree
How did you know the direction of the current in the R2 on the non- inverting example you gave?
It seems to me like the math would resolve itself with the exact same result, even if you swapped the inverting/non-inverting inputs. Is there a reason why the inverting and non-inverting inputs are the way they are in these circuits?
I may just be really dumb, but it seems like the inverting and normal op-amp both just use a voltage divider. The only difference i saw was connecting the input to the + or thr -, and which of those the voltage divider is applied to to adjust the output.
May I ask why you use 0 to 14 voltage as power supply? I think according to the datasheet, pin 4 should be connected to -14V in this case. I used LM301AN op-amp, and when I connect pin 4 to ground ( 0V ), it doesn't work. It shows that the output at pin 6 is higher than the voltage at pin 7.
In some of these tutorials I gave it the negative voltage, others I didn't. The op-amp should work either way BUT if you don't give it a negative supply, it won't be able to generate negative voltages, which means that some (many) circuits won't work correctly at times. It is always better to give it the +/- 14 volts (or whatever the datasheet says) but it is more complicated.
How much current can the inverting amp source?
Thanks so much for your useful video, they are very clear and not hard to understand. But I have a question I want ask you regarding my electrical work,how can I reach out to you sir?
Hi Daniel, I recommend checking out our Discord channel. I'm on there sometimes but there are several others that are even more responsive on there than I am. discord.gg/vdqARHb
Which op-amp are you using? Can you provide a link?
I was using this part: LF412CN/NOPB-ND and got it from Digikey: www.digikey.com/short/v312qpp1 I'm not necessarily encouraging you to use this particular part or supplier but that is what I was using in these videos.
ur plus input is grounded,,,, what happens if plus input untouchrd,,, not connected... floating
Please check the output when A DIODE l, rather than resistor, is added either at the invert or non invert pin. The outputs are very contradicting! Make videos please.
You are great, thank you very much for such a precious and kind explanation
Dear, Since I don't have practical test devices like oscilloscope etc. Does the simulation program fulfill the purpose and give me semi-real results?
Yes, simulation programs give amazingly accurate results. There are a lot of options out there but LTSpice is free, powerful, and relatively easy to use (not the easiest but not too bad for a beginner), and it has the ability to give very accurate results if you take the time to setup the circuit with more realistic models.
@@CircuitBread Thank you very much for your kind reply and advice
As I see this guy don’t reply to us viewer comments
How can we help?
WAY too much talking and explanation. The topic is covered well but all the info could have covered in a 5 minute video