The timestamps for the different topics covered in the video : 0:32 What is Impedance? 4:45 What is Input Impedance? 5:35 Why should the input impedance of the circuit needs be high? 6:57 What is output impedance? 7:28 Why should the output impedance of the circuit needs be low? 8:46 The effect of input and output impedance in the cascaded circuit/amplifier
Thank you for this explanation, it was as clear and concise as possible. For anyone still left with a bit of a fuzzy understanding, do that last portion as an exercise (after reviewing the voltage divider portion in the video)
to all about electronics sir, yr video on input impedance and output impedance Is one of the few BEST teaching i have ever come across in my life. i am lacking words to express my. thanks to u for this outstanding, aweful video demonstration. SIMPLY outstanding. for nearly 15 years i searched several books, authors and teachers to understand this but in vain. u taught too WELL that too with formulas has completely cleared my doubts. information compilation, introduction. presentation, clearly audible voice all praise worthy. I badly needed to understand this. thank u s.vatsa, Bangalore
Great video! The desired input and output impedance suggestions are fine for low frequency devices like DC power supplies and such things. For higher frequency circuits like those dealing with radio/RF frequencies, you generally want to match the input and output impedance to avoid reflections of the RF signal and provide the best signal transfer from one stage to the next.
u are just awesome bossss i can't understand EC at college but by watching your videos i get to know everything related to the topic thank you very much ❤️
Could anyone explain that how the input impedance should be higher than the series resistance? If the voltage drop in series resistance then what will happen in the input impedance?
But why do we need high impedence as impedence itself means obstruction . I mean if you increase the input impedence than we can neglect the source resistence but the net result we are getting is high than why we are increasing the impedence just to neglect that term isnt it funny. I dont understood sir please reply me. Thank-you your videos are really very helpful.wirth watching your videos.
I have already explained about the inductance in the earlier videos. You can check the video on self-inductance and mutual inductance for more information. th-cam.com/video/hoTInTKij0o/w-d-xo.html
I have pressure sensors that outputs a voltage (0-100mv DC), with an output impedance (990 ohm - 1010 ohm). For calibration, is there a way to simulate the sensor? I have a constant voltage/current source (0-100mv), but to simulate the output-impedance part, I assume it's not as simple as putting it through a 990-1010 ohm resistor.
Wonderful explanation & it's quick to understand. Thank you very much for your effort & time . Can you please post related impedance matching circuits & detailed explanation that how can we calculate the impedance matching ?
Many times in a practical system or circuits, the load impedance is lower or comparable to output impedance. For example, if you take the case of a speaker, then its impedance is few ohms. So, when you connect such a speaker with the amplifier, then the speaker will act as a load for the amplifier. And in that case, it can reduce the overall output voltage. (which is the case in most of the practical amplifier circuits) So, in the lab, yes, it is possible to connect the ZL of very high value, but practically it is not possible always. I hope it will clear your doubt.
Can I ask how to measure input impedance of an op-amp? Is that one probe to the output terminal and one probe to the ground after the op amp is powered up? Can I measure impedance in DC when frequency=0Hz with a ohmmeter? How come the impedance or resistance is very high?
Howdy. In audio it is usually recommended the PA input impedance be at least 10x the preamp. output impedance. Why is that ? Well. In audio the aim is to uphold signal voltage fidelity between stages. Not max. power transfer between stages. Say a preamp. has an output impedance of 1 k resistive. Now we load it with a PA with an input impedance of 1 k resistive. The signal transfer is half voltage and half current. The fidelty is OK. However. The impedances are seldom purely resistive. The reactance components will upset the current part fidelity. So if the PA input impedance is 10x or more the preamp. output impedance the signal current part is small. Input reactance skewing is small. So. By loading the preamp. with an impedance of 10x or more is the same as to uohold the signal voltage fidelity in transfer. Regards.
Thanks for the vid. For your two-amplifier circuit, is the input and output impedance identical? Thus amp 2 will need to be bigger impedance-wise than amp 1, but less than the load resistance?
The input impedance of the amplifier is typically larger than the output impedance. So, when two amplifiers are cascaded then in most cases, the input impedance of second amplifier is larger than the output impedance of the first one. The only thing we need to ensure is that its output impedance is sufficiently less than the load resistance. (to get max. output across the load). I hope, it will clear your doubt.
The output impedance is the Thevenin's equivalent impedance observed by the load. As you know, to find the Thevenin's equivalent resistance, we remove all the independent sources from the circuit and we consider them as zero So, that is why to find the output impedance, here all the independent voltage sources in the circuit were short circuited. I hope, it will clear your doubt.
Input impedance is the impedance of the circuit by looking from the source side. Or in other words, it is the effective impedance which is seen by the input source.
Okay so I’m getting a computer with these specs: Intel Core i5-7200U Processor 2.5GHz Microsoft Windows 10 Home 12GB DDR4 SDRAM 1TB 7,200RPM Hard Drive Intel HD Graphics 620 Multi-Format Digital Media Card Reader 2x2 802.11ac Wireless+Bluetooth 15.6" Full HD IPS UWVA WLED-backlit Multitouch-Enabled Edge-to-Edge Glass Display $450 USD Is it good enough for gaming but can double as an cost-efficient everyday computer?
It is good configuration for everyday usage and maybe even for gaming. For, gaming I think It would have been good if it has Nvidia grahics card instead of intel graphics card. But actually that depends on the kind of games you play. But for 450 USD, I feel its a good deal.
In a very simple way, you can use the op-amp as a buffer at the input and the output of the circuit. The op-amp has very high input impedance and very low output impedance. And in this way, you can maximize the input impedance and minimize the output impedance of the circuit.
The timestamps for the different topics covered in the video :
0:32 What is Impedance?
4:45 What is Input Impedance?
5:35 Why should the input impedance of the circuit needs be high?
6:57 What is output impedance?
7:28 Why should the output impedance of the circuit needs be low?
8:46 The effect of input and output impedance in the cascaded circuit/amplifier
Thank you for this explanation, it was as clear and concise as possible. For anyone still left with a bit of a fuzzy understanding, do that last portion as an exercise (after reviewing the voltage divider portion in the video)
And you sir, just made your way to my top internet educators list. I will be forever grateful. Thanks :')
to all about electronics
sir,
yr video on input impedance and output impedance Is one of the few BEST teaching i have ever come across in my life. i am lacking words to express my. thanks to u for this outstanding, aweful video demonstration. SIMPLY outstanding.
for nearly 15 years i searched several books, authors and teachers to understand this but in vain.
u taught too WELL that too with formulas has completely cleared my doubts.
information compilation, introduction. presentation, clearly audible voice all praise worthy. I badly needed to understand this.
thank u
s.vatsa, Bangalore
I have to submit my assignment today, and this topic kept on bothering me from yesterday, but thanks to you, I finally got it. Thank you very much!
Great video! The desired input and output impedance suggestions are fine for low frequency devices like DC power supplies and such things. For higher frequency circuits like those dealing with radio/RF frequencies, you generally want to match the input and output impedance to avoid reflections of the RF signal and provide the best signal transfer from one stage to the next.
I have a problem with this. Can you help me if l tell you my problem?
u are just awesome bossss i can't understand EC at college but by watching your videos i get to know everything related to the topic thank you very much ❤️
U are just Awesome
Excellent refresher, concise and to the point!😀
best explanation on this topic! Thanks a lot.
Thank you for making such detailed video which covers all things.
Fanatic explanation sir!
Such a clear explanation , Perfect presentation!
Very helpful, thanks so much!!
Thank You for your efforts.
Good luck for your channel.
Perfect explanation , very helpful
very beautifully exaplined
you are excellent and explanation was soo good bro ,thank you for this type of useful videos especially for students
Thank u so much for this wonderful explanation...all of my doubts are clear now ☺️
So nice information. Please you should also make this type of video in hindi .
excellent video.
super hard to comprehend this guys speech and the topic at the same time
Please use the subtitles if required. It will help you.
just awesome explanation ,thank you sir !!!
Very clear explanation.thank you sir.
Could anyone explain that how the input impedance should be higher than the series resistance? If the voltage drop in series resistance then what will happen in the input impedance?
Simply amazing man!!!!
But why do we need high impedence as impedence itself means obstruction . I mean if you increase the input impedence than we can neglect the source resistence but the net result we are getting is high than why we are increasing the impedence just to neglect that term isnt it funny. I dont understood sir please reply me.
Thank-you your videos are really very helpful.wirth watching your videos.
Great videos, I am looking forward your next videos
Actually did you missed to explain about inductors and inductance?
I have already explained about the inductance in the earlier videos.
You can check the video on self-inductance and mutual inductance for more information.
th-cam.com/video/hoTInTKij0o/w-d-xo.html
I salute uh sir.....
I have pressure sensors that outputs a voltage (0-100mv DC), with an output impedance (990 ohm - 1010 ohm).
For calibration, is there a way to simulate the sensor? I have a constant voltage/current source (0-100mv), but to simulate the output-impedance part, I assume it's not as simple as putting it through a 990-1010 ohm resistor.
Does output impedance is changing with the output of the sensor or it is constant ?
Wonderful explanation & it's quick to understand. Thank you very much for your effort & time . Can you please post related impedance matching circuits & detailed explanation that how can we calculate the impedance matching ?
Great explanation! Thanks.
Sir 7:56 why can't we put ZL very high in order to keep the Vo' =Vo?? As we did for input impedance case.?? Sir, please answer. I'm confused.
Many times in a practical system or circuits, the load impedance is lower or comparable to output impedance. For example, if you take the case of a speaker, then its impedance is few ohms. So, when you connect such a speaker with the amplifier, then the speaker will act as a load for the amplifier. And in that case, it can reduce the overall output voltage. (which is the case in most of the practical amplifier circuits) So, in the lab, yes, it is possible to connect the ZL of very high value, but practically it is not possible always.
I hope it will clear your doubt.
Can I ask how to measure input impedance of an op-amp? Is that one probe to the output terminal and one probe to the ground after the op amp is powered up? Can I measure impedance in DC when frequency=0Hz with a ohmmeter? How come the impedance or resistance is very high?
What if we have another source inside that circuit or system, would it be included in the Zin ?
Howdy. In audio it is usually recommended the PA input impedance be at least 10x the preamp. output impedance. Why is that ?
Well. In audio the aim is to uphold signal voltage fidelity between stages. Not max. power transfer between stages.
Say a preamp. has an output impedance of 1 k resistive. Now we load it with a PA with an input impedance of 1 k resistive. The signal transfer is half voltage and half current. The fidelty is OK.
However. The impedances are seldom purely resistive. The reactance components will upset the current part fidelity.
So if the PA input impedance is 10x or more the preamp. output impedance the signal current part is small. Input reactance skewing is small.
So. By loading the preamp. with an impedance of 10x or more is the same as to uohold the signal voltage fidelity in transfer.
Regards.
Hey, So I'm a little confused where does Rs come from, is that resistance created by the source voltage ore something related to the load?
It is source resistance, the resistance in series with the voltage source.
Thanks for the vid. For your two-amplifier circuit, is the input and output impedance identical? Thus amp 2 will need to be bigger impedance-wise than amp 1, but less than the load resistance?
The input impedance of the amplifier is typically larger than the output impedance. So, when two amplifiers are cascaded then in most cases, the input impedance of second amplifier is larger than the output impedance of the first one. The only thing we need to ensure is that its output impedance is sufficiently less than the load resistance. (to get max. output across the load).
I hope, it will clear your doubt.
@@ALLABOUTELECTRONICS yes, thank you very much!
Thank you sir for this video
very clear thank you
Awesome. Keep it up.
Sir, why do we short circuit the source to find the output impedance???
The output impedance is the Thevenin's equivalent impedance observed by the load. As you know, to find the Thevenin's equivalent resistance, we remove all the independent sources from the circuit and we consider them as zero
So, that is why to find the output impedance, here all the independent voltage sources in the circuit were short circuited.
I hope, it will clear your doubt.
Very nice.
Sr I have an doubt
what u said while introducing input impedance is by saying source perspective ...
that part I was not able to understand
Input impedance is the impedance of the circuit by looking from the source side.
Or in other words, it is the effective impedance which is seen by the input source.
GREAT!
Very good
Appreciate with many thanks
Please make video on transistor...as soon as possible
Sir do the video on high input amplifier
please make videos on transistor and mosfet
If you are designing an actual circuit, how do you ensure that those conditions are met??
Practically, for impedance matching a buffer can be used. It will isolate the two circuits and minimize/ eliminates the loading effect.
@@ALLABOUTELECTRONICS Do you have a video on buffers?
shata nu artha agilla dabbba video
God bless you
thnx bhai :)
Can u add videos on ADC type s and working
Yes, some of you have already asked me to make the videos on ADC and DAC.
So, I will definitely make the videos on it.
Okay so I’m getting a computer with these specs:
Intel Core i5-7200U Processor 2.5GHz
Microsoft Windows 10 Home
12GB DDR4 SDRAM
1TB 7,200RPM Hard Drive
Intel HD Graphics 620
Multi-Format Digital Media Card Reader
2x2 802.11ac Wireless+Bluetooth
15.6" Full HD IPS UWVA WLED-backlit Multitouch-Enabled Edge-to-Edge Glass Display
$450 USD
Is it good enough for gaming but can double as an cost-efficient everyday computer?
It is good configuration for everyday usage and maybe even for gaming. For, gaming I think It would have been good if it has Nvidia grahics card instead of intel graphics card. But actually that depends on the kind of games you play.
But for 450 USD, I feel its a good deal.
Thanks
super sir
How to minimise or maximise the input and output impedance practically ??
In a very simple way, you can use the op-amp as a buffer at the input and the output of the circuit. The op-amp has very high input impedance and very low output impedance. And in this way, you can maximize the input impedance and minimize the output impedance of the circuit.
Good
Damn good
I listened to three minutes of the video, was he speaking Spanish or English or some other language ?
I LOF UUUU
super mowa
Indian accent is big problem
This is terrible, as usual, cant understand a thing you are saying.
can't understand your indian accent, please do it in english accent.
If required, please use subtitles.