Rushal, thank you so much for creating these videos. They have definitely helped me throughout college so far and you have done a great job with the explanations/animations.
I remember during college days I used to think, Why LPF and HPF in cascade doesn't result in Band stop filter, just like cascading HPF & LPF result in Band Pass Filter The reason is when we use less cut off frequency LPF and High cutoff frequency HPF. The multiplication or cascade will results in LPF only bcz the LPF output is zero after its cutoff frequency which restricts the role of HPF
How about designing the band pass and band stop filter using L and C components. Does it have any good filtering compared to R and C..Could please explain.
What will happen if the out puts of the two Opamps are connected directly (i.e without the two 1K Ohms resistors @12:55 of video) as the output of the band stop filter? I will be really obliged for your prompt clarification.
Hi from Poland, I loved your video, you explained everything well. It was really helpful for me. Could you just tell me if for band stop filter f_H frequency will be always higher than f_L and for band pass filter f_L will be always higher than f_H?
f_L stands for lower cut-off frequency and f_H stands for higher cut-off frequency. So, irrespective of band-pass of band-stop, when we refer f_H and f_L, f_L is always less than f_H. I hope it will clear your doubt.
@@ALLABOUTELECTRONICS, thanks I had doubts cause in 5:30 minute you calculated fc1 and fc2 and low pass filter is higher than high pass filter. Low pass filter is 106.1 kHz and high pass filter 10.61 kHz. That's why my question :)
Excellent Videos. I have a quick question. In the band stop filter why we are connecting the outputs of the LPF and HPF at the inverting terminal of the summing amplifier (voltage adder circuit). Will, it not then work as a subtractor rather than working as an adder? Cause if we want to add, do not we have to connect the outputs of the LPF and HPF at the non-inverting terminal of the summing amplifier?
The outputs of the LPF and HPF will get added bu the output will be inverting (will have 180 degrees of phase shift and looks like -(VLP + VHP)) as it is connected at inverting terminal. To get a positive output, one more inverting amplifier will be required. I Hope it will clear your doubt. If you still have any doubt then do let me know here.
I think you are referring to 10:05 right ?? They are used to provide the gain. -Rf/R1 and -Rf/R2 will be the gain for upper and lower stages respectively. Let's say the output of the upper filter circuit with buffer is Vx and for the lower circuit, it is Vy. Then the overall output will be (-Rf/R1)Vx + (-Rf/R2)Vy. I hope it will clear your doubt.
After cascading a first order low pass and first order high pass we get , second order bandpass then why should we take 3db fall instead of 6 db (for second order)?
Irrespective of the order of the filter, we always look for 3 dB point where the voltage becomes 0.707 of the peak value or the power becomes half. So, depending on the order of the filter, 3 dB frequency will change. I hope, it will clear your doubt.
Its amplitude. If we plot the transfer function then we will get two plots. Phase vs frequency and second is amplitude vs frequency. I hope it will clear your doubt.
Thanks for a nice video. Would you kindly tell us that what is the purpose of the adder (at 12:55 of the video)? Why can't we simply join (short) the outputs of the low pass and high pass filter & take the output from that point. What will happen if we don't use opamps and just use one high pass and one low pass filters in parallel?
Using Op-amp we can avoid the loading effect. If you simply connect the output of individual filters or to say if you connect them in parallel, then you will see the loading effect. So, it is good practice to add the individual filter responses using Op-amp.
The frequency response of the cascaded system is the overlap of the individual frequency response. In case if try to implement the bandstop filter by cascading the low pass and high pass filter then the output would be the overlap of the individual response. If there is no overlapping region, then probably you will not get anything at the output. For the bandstop filter, it should reject only a particular band of frequencies and should pass all other frequencies. So, If you just cascade the LPF and HPF then either you get some overlapping region or nothing at all. And that's not the frequency response of the Bandpass filter. So, to get the desired frequency response for the bandstop filter, you need to use adder. I hope it will clear your doubt.
In case of cascade connection, the output will be the overlapping region of the individual response. Suppose, you cascade the LPF followed by HPF, then after LPF, all high frequencies are already attenuated. So, even if you use HPF, it will not pass high frequencies as there no high frequencies to pass. That's why adder is used. I hope it will clear your doubt.
It is frequency dependent. It depends at what frequency we are looking at. But I think you are talking about parallel resonant circuit (which acts like a band stop filter).
Just apply the sine wave with variable frequency (You can apply it using the signal generator). and measure the output signal amplitude. The ratio of output to the input will give you pass band gain.
@@ALLABOUTELECTRONICS sir i was asking whether it will still work as Band Pass Filter or not? If signal is input to that what will happen? What will be output?
It will still work as band pass filter. But you need to carefully select the cut-off frequencies of both filters (to get an overlapping region) for band pass filter.
I have already replied to that question in earlier comments. Here, I am copying that answer: In case of cascade connection, the output will be the overlapping region of the individual response. Suppose, you cascade the LPF followed by HPF, then after LPF, all high frequencies are already attenuated. So, even if you use HPF, it will not pass high frequencies as there no high frequencies to pass. That's why adder is used. I hope it will clear your doubt. If you still have any question then do let me know here.
Add in cascade ..u will find a result whereinn only high pass filter willbe effective then. Similarly in LPF if you parallel them,, nothing would be filtered. Check it
Yes, more videos will be uploaded on filters. I will try to cover almost all types filters in the upcoming videos. But next couple of videos will be on different topic (on Network analysis).
sir please complete this filter circuit part as soon as possible because it is very important in competitive exam too and we the aspirants are waiting to learn from you,thank you sir for such contribution........
I will try to complete it now as soon as possible. Next video is on technology. But then after I will try to complete this filter circuit portion as soon as I can.
Kindly turn off the subtitles for that particular time. I will try to keep that thing in mind so that from now on even if subtitles are used, the values will remain visible.
A notch filter is band stop filter with very narrow stop band. Normally, the band stop filters rejects certain band of frequencies but when you want to remove a specific very narrow band of unwanted frequency then in such cases this notch filter is used.
You have designed all filters using R-C combinations. How we can forget inductor in filter designing? Please ensure you make filters using R, L and C. In most of the cases that are being prcatically implemented, we usually observe combinations of R,L and C. Please ensure it.
Your excellent video needs a narration from somebody with an accent easier to understand. Fighting the technical matters is bad enough without trying to unravel what is being said! The English is fine but the accent needs 'working on!"
I am from NIT you are teaching better than my professors who have 30 years experience
which nit??
Maybe mizoram Or jammu
I am from iit bhu
Rushal, thank you so much for creating these videos. They have definitely helped me throughout college so far and you have done a great job with the explanations/animations.
Wow! very simple, but I was struggling the whole semester. Thanks a lot.
The point is we care towards the wnd of the semester. 😇
Damn!! I should have come here 2 years back.
Awesome job man!
Finally understnad one of guitar pedal knobs. Thank you so much
Great Job, thanks for share it, i am from Argentina and you explain better than my professors
Hello Fabio, really he explained this in an excellent way.....
You're a legend, your videos been helpful in all aspects of studying electronics. Thankyou
great job . i never understood when my teachers talk about those filters . now u with juz 13 mins video damn , i got it all . thanks
Loving your videos a loooot. N thank u soooo much. I'm a second year electrical engineering student... Love from my side
Hi
Yes Naurin, really good videos....
Your way of teaching is awesome
Thanks bro God bless u saved my time for my circuit designing subject project
Respect from Bahrain
Cleared up my misunderstanding about band pass filters. Thanks
Yes bro, he had explained really good....
your way of teaching is appreciable.
Norman Nosher
Appreciable? er Appreciated.....
You are a very good teacher. Thank you.
Great job bro.you are making the youngest minds to think bro.niceeee.
Yes Puneeth, really good....
Great explanation.
Like the way you study.
THX
I remember during college days I used to think, Why LPF and HPF in cascade doesn't result in Band stop filter, just like cascading HPF & LPF result in Band Pass Filter
The reason is when we use less cut off frequency LPF and High cutoff frequency HPF. The multiplication or cascade will results in LPF only bcz the LPF output is zero after its cutoff frequency which restricts the role of HPF
Great video's and easy to follow keep up the great work...
Bhai u have good knowledge about filter...keep it up .
Your videos are excelent , I enjoy learning from them.
Yes bro, really good....
Can you teach how to make circuit second order n third order of band pass filter? By using opa602bp
Thank you for your great videos!
How about designing the band pass and band stop filter using L and C components. Does it have any good filtering compared to R and C..Could please explain.
Great knowledge sir love u 😍
good explaining
Your videos are awesome. It's so easy to follow
Is it necessary that the adder circuit be an invverting one? Can't it be just a regular one?
What will happen if the out puts of the two Opamps are connected directly (i.e without the two 1K Ohms resistors @12:55 of video) as the output of the band stop filter? I will be really obliged for your prompt clarification.
If you do not require any gain then yes you can connect.
Awesome explanation...post a video on Derating...
great video , can this be used for filtering visible light into different spectrum ? I know how to do that chemically but I want to make it digital .
For that, you need to use an optical filter. They are available for different wavelength
Great thanks for your efforts
your videos made my day
Yes Tarun this is excellent....
this video is amazing thank you so much (Y)
so, in case of band and stop pass filter, we don't concern about the gain?
love from mahesh babu fans
why we have to take the geometric mean of fc2&fc1 as the centre frequency?
and why here arithmetic mean will not be used?
Centre frequency doesn't always lie in the middle of fc2 and fc1 . In order to keep it in middle Q factor of circuit must be quite high.
Hello, thanks. Any guide to designing these filters in microwave frequencies?
Thanks for this. Great video.
Yes Samuel, really good video....
Nice
I simulated your stop bass design with multisim and I only got a low pass filter with really hig cutoff
What is the transfer function of fourth order recursive bandpass filter in the range 5-15 Hz using z transform.
sir, can you please explain twin T notch filter?
Hi, would you be able to go through frequency response for the Akerberg-Mossberg Notch filter please.
If I don't fail this sem...it's due to you😇
Hi from Poland, I loved your video, you explained everything well. It was really helpful for me. Could you just tell me if for band stop filter f_H frequency will be always higher than f_L and for band pass filter f_L will be always higher than f_H?
f_L stands for lower cut-off frequency and f_H stands for higher cut-off frequency. So, irrespective of band-pass of band-stop, when we refer f_H and f_L, f_L is always less than f_H. I hope it will clear your doubt.
@@ALLABOUTELECTRONICS, thanks I had doubts cause in 5:30 minute you calculated fc1 and fc2 and low pass filter is higher than high pass filter. Low pass filter is 106.1 kHz and high pass filter 10.61 kHz. That's why my question :)
Excellent Videos. I have a quick question. In the band stop filter why we are connecting the outputs of the LPF and HPF at the inverting terminal of the summing amplifier (voltage adder circuit). Will, it not then work as a subtractor rather than working as an adder? Cause if we want to add, do not we have to connect the outputs of the LPF and HPF at the non-inverting terminal of the summing amplifier?
The outputs of the LPF and HPF will get added bu the output will be inverting (will have 180 degrees of phase shift and looks like -(VLP + VHP)) as it is connected at inverting terminal. To get a positive output, one more inverting amplifier will be required.
I Hope it will clear your doubt. If you still have any doubt then do let me know here.
@@ALLABOUTELECTRONICS Wouldn't it be the same thing to just connect them to the non inverting input and have both outputs of the filter added?
Thanks for helping
why we need R1 and R2 in the adder?
I think you are referring to 10:05 right ?? They are used to provide the gain. -Rf/R1 and -Rf/R2 will be the gain for upper and lower stages respectively. Let's say the output of the upper filter circuit with buffer is Vx and for the lower circuit, it is Vy. Then the overall output will be (-Rf/R1)Vx + (-Rf/R2)Vy.
I hope it will clear your doubt.
Yes at 10:05. So it is mandatory put them in the circuit , Rf is not enough, right ?
I thought that to the adder (the circuit on the right ) Rf was enough to work properly.
No, R1, R2 are required. It's basically summer circuit. For more information, you can check the video on op-amp as summer.
@@ALLABOUTELECTRONICS ok thanks , I will check this video. Btw merry Christmas :)
Transfer function of the bandpass filter was not explained. Unfortunately.
After cascading a first order low pass and first order high pass we get , second order bandpass then why should we take 3db fall instead of 6 db (for second order)?
Irrespective of the order of the filter, we always look for 3 dB point where the voltage becomes 0.707 of the peak value or the power becomes half. So, depending on the order of the filter, 3 dB frequency will change.
I hope, it will clear your doubt.
@@ALLABOUTELECTRONICS
Thank you sir...is it is true for both active and passive filters
Can u tell about second and higher order band filters
Thanks a lot
doubt
bro is that amp means ampere in the the graphs that you have drawn plz someone clarify
Its amplitude. If we plot the transfer function then we will get two plots. Phase vs frequency and second is amplitude vs frequency.
I hope it will clear your doubt.
Do you have a video on multiple feedback bandpass filter with actual op amp IC?
Do you mind going over OSCILLATORS? Please!!! I love your work really easy to understand unlike my professors!
Thanks, soon I am going to cover it.
ALL ABOUT ELECTRONICS hoping it’s soon enough since my test is in a day lol... thanks for replying love ur channel!
Sir, please make a video on phased lock loop...its a very confusing topic
Yes, very soon I will make it.
@@ALLABOUTELECTRONICS will be eagerly waiting...
What is the difference equation of fourth order bandpass our filter
IIR*
great video thank you.
Thanks for a nice video. Would you kindly tell us that what is the purpose of the adder (at 12:55 of the video)? Why can't we simply join (short) the outputs of the low pass and high pass filter & take the output from that point.
What will happen if we don't use opamps and just use one high pass and one low pass filters in parallel?
Using Op-amp we can avoid the loading effect. If you simply connect the output of individual filters or to say if you connect them in parallel, then you will see the loading effect. So, it is good practice to add the individual filter responses using Op-amp.
Thanks for the prompt response.
Hi, how to design a 50Hz notch filter?
Why do we use an adder for the band stop
While cascade for band pass?
Can we use a cascade for band stop as well?
The frequency response of the cascaded system is the overlap of the individual frequency response. In case if try to implement the bandstop filter by cascading the low pass and high pass filter then the output would be the overlap of the individual response. If there is no overlapping region, then probably you will not get anything at the output.
For the bandstop filter, it should reject only a particular band of frequencies and should pass all other frequencies. So, If you just cascade the LPF and HPF then either you get some overlapping region or nothing at all. And that's not the frequency response of the Bandpass filter. So, to get the desired frequency response for the bandstop filter, you need to use adder.
I hope it will clear your doubt.
@@ALLABOUTELECTRONICS Yes i understand now. Thank you very much.
Hello Asha, I hope you got it right....
why dont we cascade LPF with HPF in band stop filter instead u have used adder but in case of band pass filter, cascading of HPF with LPF is done...
In case of cascade connection, the output will be the overlapping region of the individual response. Suppose, you cascade the LPF followed by HPF, then after LPF, all high frequencies are already attenuated. So, even if you use HPF, it will not pass high frequencies as there no high frequencies to pass. That's why adder is used.
I hope it will clear your doubt.
+ALL ABOUT ELECTRONICS thnx alot
great video, thanks alot
Superb!!
hello, we are using 144mhz, so many interference here in my working q
Need to know about RLC High Pass filter
Yes Suraj, really nice videos.....
How to find gain of stop band filter?
I love ur video.nice one
in which filter the output current becomes very less than input current
It is frequency dependent. It depends at what frequency we are looking at. But I think you are talking about parallel resonant circuit (which acts like a band stop filter).
Hello sir
Muje 140hz to 5k ka passiv filters bnadoge please??
Good explanation but using transfer function or different frequencies, if you prove mathematically then it would be more clear.
Dear Prathyush, you can refer my channel for more details..
thanks bro
*Bro that was about wide type (of bandpass and band stop)
pls explain narrow type also*
Here who are from madan mohan Malaviya gorakhpur
does anyone know why the FC2 is in HZ , and FC1 is in KHZ ? +
Would you please mention the timestamp where you are referring to ?
Great video although your intro music is painful to here..
How to calculate the pass band gain practically
Just apply the sine wave with variable frequency (You can apply it using the signal generator). and measure the output signal amplitude.
The ratio of output to the input will give you pass band gain.
What will happen if we use Low pass filter first and then High pass filter?
Since it is cascade connection, you can interchange the blocks.
@@ALLABOUTELECTRONICS sir i was asking whether it will still work as Band Pass Filter or not? If signal is input to that what will happen? What will be output?
Yes, it will work.
It will still work as band pass filter. But you need to carefully select the cut-off frequencies of both filters (to get an overlapping region) for band pass filter.
Yes Raj, this will work...
why you put both filter in parallel ?
why not cascading ?
I have already replied to that question in earlier comments.
Here, I am copying that answer:
In case of cascade connection, the output will be the overlapping region of the individual response. Suppose, you cascade the LPF followed by HPF, then after LPF, all high frequencies are already attenuated. So, even if you use HPF, it will not pass high frequencies as there no high frequencies to pass. That's why adder is used.
I hope it will clear your doubt.
If you still have any question then do let me know here.
Add in cascade ..u will find a result whereinn only high pass filter willbe effective then.
Similarly in LPF if you parallel them,, nothing would be filtered.
Check it
Pls sir which book we follow
For filters, you may refer electronics principles by malvino.
What did you say?
I pretty sure he is dubbing in "band pass filter"
Hi please a question
Do we use this band pass filter to determine raw signals?
sir will u upload more videos on filters or its done ?
Yes, more videos will be uploaded on filters. I will try to cover almost all types filters in the upcoming videos. But next couple of videos will be on different topic (on Network analysis).
sir please complete this filter circuit part as soon as possible because it is very important in competitive exam too and we the aspirants are waiting to learn from you,thank you sir for such contribution........
I will try to complete it now as soon as possible. Next video is on technology. But then after I will try to complete this filter circuit portion as soon as I can.
ALL ABOUT ELECTRONICS@thanks sir for your valuable reply, within this month can it be possible??
At least 2-3 more videos on filters will be covered, which will cover almost all required aspects of the filter.
Gud
Yes Ms. Lukose, this video is very good....
I agree....this video is very good...
Nice video
#electronspark
Some values are not visible because of subtitles..
Kindly turn off the subtitles for that particular time. I will try to keep that thing in mind so that from now on even if subtitles are used, the values will remain visible.
Dude you can drag the subtitles anywhere in the video screen
What is notch filter
A notch filter is band stop filter with very narrow stop band. Normally, the band stop filters rejects certain band of frequencies but when you want to remove a specific very narrow band of unwanted frequency then in such cases this notch filter is used.
Sir may I know which text book u prefer
To get basic idea about filters, electronic principles by Albert Malvino is good book.
Yes Satya Malvino is a good book....
how to get a band-pass from a band-stop? HEEELP please :(
a video about audio filtering and the voice sound awful. please turn the gain of your microphone down
papa666
And do something about that impenetrable accent.
👌👍
You have designed all filters using R-C combinations. How we can forget inductor in filter designing? Please ensure you make filters using R, L and C. In most of the cases that are being prcatically implemented, we usually observe combinations of R,L and C. Please ensure it.
Yes, that's correct. I know it. I am planning make videos on filter design using R, L and C.
Umer Sir, why dont you make one and load for everyones benefit
Filter... Filter... Filter.. I get it, its a filter!
If we do this in practical ..then which op amp should be used
IC741
Sikha, you can use 741 or any other OP-amp
jai ssmb
Super anniiyya
Sir Hindi me bataiye plz
Your excellent video needs a narration from somebody with an accent easier to understand.
Fighting the technical matters is bad enough without trying to unravel what is being said!
The English is fine but the accent needs 'working on!"
I cleared every arrears thanks bro 🥹❤️