Schmitt Trigger Explained (Design of Inverting and Non-inverting Schmitt Trigger using Op-Amp)
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- čas přidán 1. 07. 2024
- In this video, Schmitt trigger circuits are explained.
After watching this video you will learn what is Schmitt trigger, how Schmitt trigger works, and how it can be designed using the op-amp.
What is Schmitt Trigger?
In a simple way, it can be defined as a comparator with hysteresis.
The Schmitt trigger circuit has two threshold voltages.
1) Upper Threshold Voltage
2) Lower Threshold Voltage
The difference between the two threshold voltage is known as the hysteresis.
Because of two threshold voltages, the noise immunity of the circuit can be increased by using this Schmitt trigger.
The Schmitt trigger circuit is characterized by the hysteresis curve or the voltage transfer curve.
There are two types of Schmitt triggers:
1) Inverting Schmitt Trigger
2) Non-Inverting Schmitt Trigger
In this video, you will learn how inverting and non-inverting Schmitt triggers can be designed using the op-amp.
The expression for these inverting and non-inverting Schmitt triggers are also derived in this video.
Application of Schmitt Trigger:
1) For comparison of voltage levels
2) Analog to Digital Converters (ADC)
3) As Waveform Converter
4) Designing Multivibrator or Oscillator circuit
The timestamps for the different topics covered in the video is given below:
0:28 Limitation of the comparator circuit
2:00 What is Schmitt Trigger and how it works?
4:15 Hysteresis Curve of Inverting and Non-Inverting Schmitt Trigger
8:00 Design of Inverting Schmitt Trigger (with Derivation)
12:50 Design of Non-Inverting Schmitt Trigger (with Derivation)
18:30 Application of Schmitt Trigger
This video will be helpful to all the students of science and engineering in understanding the Schmitt trigger circuit.
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Don't watch this video if your tired. I had to go through it three times especially for the non-inverting Schmitt Trigger. Has a lot of math associated with it for such a simple device. Great video, I feel I understand it much better and now can design with it.
bro it's trivial en tabarnak juste un diviseur de potentiel pis that's it
Yeah me too had a tough time understanding it😅
You underestimate my power to study at the last minute at 4 am in the morning. I'm very tired...
@@vaishrox66 you're extrovert and lonely, how?
Same u know, I don't get it, 5 times yesterday night, just 10min today morning, I understood very clearly🥹
I wonder why this channel has 237k subscribers only!!!
He deserves much more
Love your explanation Sir❣❣❣
Yes Anik, he deserves more subscribers....
Only 1 percent engineering student watch this channel .
As a professional electronics designer with decades of deep experience.... In my eyes the video misses to explain expectable problems.
For example I woder why they use an OPAMP because not every OPAMP can do this. Some OPAMPs my burn (violating diff_V_IN), some OPAMPS may create crazy output (phase reversal). If you want saturated output it´s always the safe way to use a comparator (instead of OPAMP). There is a good reason why there are OPAMPS and COMPARATORS, they are not the same thing.
@@klaus2t703 chup hai hume samaj mai aa rha ha dimag mt laga
@@klaus2t703 Bro, I want to have knowledge like you. Do you have any suggestions on what to do? Or any YT channel that tells stuff like this?
This Man..... Is Genious !!! Thank you sir poora youtube dekha, aapke itna best kisine nahi samjhaya... watching it 2 days before exam...
He has 6Lakhs subs now
All praises to you Sir!
you saved me for my Semester
You make me understand something that my proff can't explain it for me,
Yes bro! Better electrical engineers are made from CZcams rather than universities! 😬
Extremely clear explanation. Love it.
Thank You Sir for providing such a great content, we have our exams next week and your videos lectures really helped me in clearing all of my doubts for the subject, once again thanks a lot for posting such informative content
great content! It really helps me a lot when I am learning this stuff all by myself.
me too.this is really helpfull for self study students
thank you sir for giving such a clear explanation you are superb
Thank you for your very clear explanation sir.
Watching from Madagascar
You are a good Amplifier when it comes to simplifying
Your explanation was awesome 🤗. Thank you
Good method and teaching. I wish you success as lecturer and best of luck in your profession.
Very good presentation. Thankyou very much!
You are great. Clear explanation.
Very helpful video, this helped me get through my finals, thanks a lot!
Schmitt Trigger using Op-Amp well explained !
really very good and simple explanation
Many thanks for the video :)
Easy to learn 👍
Thanks a lot
Thank you sir, great video
THANKS FOR YOUR EFFORT SIR
Too good expained.. Thank you.. 🎉🎉🎉
Thanku so much 4 ur guidance
I come back here whenever I find trouble in transfer curve. All of my doubts gets solved. Thank you ❤️
excellent appriciated,wellexplained.liked vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv much
Amazing as usual
great video bro
Thanks its so clear
thaaaaank you, better than my uni teacher
Thanks dude:)
We want more topics sir.You starts from the basic..
very helpful videos sir...
10:21 : you said Vin > V1 then output will be Vut
_Doubt_ : What when Vin < V1 ? How will be the output?
the video was great and intresting
Excellenttttttttt........Explanationnnnnnnnnn..
you are the best
Great video! , Can you also make a video of Schmitt trigger with BJTs or MOSFETs?
Good Man
thank you very much
Hi.I like your video very much. It's really great. I'll keep an eye on your channel. I am your fan and I will support you.
Yes, friend you said it right....
thanks and keep up the good work.
waiting for lectures on transistor models amplifiers and oscillator
Thank you sir
Extremely....... Clear explanation sir......
Thanks a lot ☺️
Thank You :)
It's an amazing lecture. It clears all my doubts . But I have request for you can you provide written notes on opamp
bsdk sab yehi kar de tu khali laar chaat
00:12 Schmitt Trigger is a comparator with hysteresis
02:32 Schmitt Trigger provides noise immunity over a band
04:57 Schmitt Trigger has a transfer characteristic curve known as the hysteresis curve.
07:32 Learn how to design inverting and non-inverting Schmitt Triggers using op-amp.
09:56 Inverting Schmitt Trigger has upper and lower threshold voltages
12:32 Designing Schmitt Triggers using Op-Amp
15:12 The upper and lower threshold voltages for a non-inverting Schmitt Trigger
18:01 Schmitt Trigger can be used as a level comparator, wave shaping circuit, and oscillator.
Crafted by Merlin AI.
Thank you so much sir got it please make vedio on examples numaricals of s.trigger
Yes, very soon I will make it.
Thank you
Is it possible to detect Reverse and Forward flow of IR using this schmitt trigger ?
You should get a noble prize in teaching. thanks
Exactly....
Sir can u pls make a dedicated video on hysterisis ?
Hello,
Would You explain to me, how did I get shift of transfer characteristics, for example: VH=2V, VL=-3V (not -2,5 and 2,5 as usual)? How is this possible?
I've been using Hall sensor with Schmitt trigger for multipole magnetic encoder and on the output I got signal with 1/3 duty cycle, instead of 1/2 duty cycle (poles are equal, but reverse in sign).
Does transfer characteristics shift depend on Vref? How did we get Vref - I mean once per measurement (on the every begining of each multipole encoder measurement it takes valuse dependent on first pole it measured and it is constant through whole measurement) or every time we cross VL or VH threshold? Does characteristics shift constant through whole measurement (if it is) or does it change every time we cross VL or Vh threshold? I would be very greatful for Your response!
Very good
For the inverting Schmitt trigger is VL and VH the voltage supplied the op-amp as in VCC
yes, both for inverting and non inverting
Nice
one word...UYIR
Lovely
Vut=Vref+(Vref-Vlow)*R1/R2
Vlt=Vref+(Vref-Vhigh)*R1/R2
Is the formula of upper and lower threshold voltage correct for Non-inverting scimitt trigger with reference voltage?
helpful
Thank u sir
Super
Which software is used to make circuit diagram and graphs 📊
17:20
Why negative vh?
in the beginning when the input crosses lower threshold voltage, why does the output not change accordingly?...just in the beginning?
and watch out when applying reference voltage because it also has a factor attached to it
thanx again
thnks
🙏🙏🙏🙏Thanks 🙏 🙏 🙏 🙏
Sir in non inverting st you say ki v1>0 then output is high similarly when v2
Dear Ashish, something is missing ....
Very good video
Yes Deepty, really good video....
mst padhaya ekdm
Explanation is very nice..thanq sir
But the voicenotes are disturbing the video during explaination 😊
Why you don't use inverting sc hmit trigger circuit? Is it not happen with referrence voltage
Sir may you please explain what is noise immunity here
Super video
Very useful
Can you upload "555 timer as Schmitt trigger" topic please?
Awaiting
Hello friend, in my channel, these videos are available...
Make an video for schmitt trigger using IC555
Thanks for the video. I have one doubt. Will the concept of virtual ground not applicable in Schmitt trigger? Kindly reply.
No, because it's applicable only when the opamp is used with negative feedback. In Schmitt trigger it is used in positive feedback configuration. So opamp is operating in the saturation. That's why it's not applicable.
@@ALLABOUTELECTRONICS thanks for your prompt reply. Sir, what is the reason that virtual ground is only applicable in negative feedback?
why is V+ assumed to be greater than Vout???
Schmitt trigger is a ___ voltage comparator.(+ve,-ve,both,none) sir what is the answer of this
I've not understood why (physical why), the behavior of the positive feedback is so different from the negative one, looking at the negative one it is easy to see that V- follows the V+ and doing the KVL across the inverting branch and negative feedback the result will be Vout negative if Vin positive and the opposite if Vin is negative... obviously i cannot do the same with the positive feedback but i don't understand why
AT 2:13 you have the upper thresh hold voltage sending output from low to high but that is only true for the non-inverting ST. For the inverting ST the upper thresh hold voltage signals the point where the output goes from high to low.
indeed !
The timestamps for the different topics covered in the video is given below:
0:28 Limitation of the comparator circuit
2:00 What is Schmitt Trigger and how it works?
4:15 Hysteresis Curve of Inverting and Non-Inverting Schmitt Trigger
8:00 Design of Inverting Schmitt Trigger (with Derivation)
12:50 Design of Non-Inverting Schmitt Trigger (with Derivation)
18:30 Application of Schmitt Trigger
Please tell
Hi. I have a doubt. What determines V (high) and V (low)? Are they equal to +Vcc and -Vcc respectively?
@@abaundwal V(high) can be sometimes equal to Vcc. To be more specific, V(high) is the Saturation voltage when a positive input (V+ - V-) is given to op-amp. However, many a time, Saturation voltage may be equal to Vcc or slightly less than it.
👍👍👍👍
@all about electronics schmit trigger is a circuit positive feedback applied to the comparator.is it right?
Hello, Schmitt Trigger is basically a comparator, with positive feedback...
Pls upload videos on Communication systems
I have already started the series on it. Please check the latest videos. Or you can check this playlist. More will be uploaded in coming weeks.
czcams.com/play/PLwjK_iyK4LLArUHRm3SvPLT0XWlVhpl4h.html
why i take Vo= Vth why we dont assuming Vo =0v
Bro, Vo cannot be zero as the output of Schmitt trigger will be either at +Vsat or at -Vsat.....
Plz send the note in pdf or give the link for notes in description
How in hysteresis curve,if Vh and Vl equal and opposite in polarity makes hysteresis curve symmetric to y-axis.
It has been assumed that the positive and the negative supplies of the op-amp are equal and opposite in polarity.
And usually, it used to be the case for the op-amp. that's why it is symmetric about the y-axis.
I hope it will clear your doubt.
In non inverting case if Vout is low then V^+ is less than 0 ie V^+=r2/(r1+r2) + r1/(r1+r2)*Vl not Vh.........can u explain why u wrote Vh instead of Vl
At 10:07 you said to take Vout = Vh (Vh is high output when V+ >Vin)... On the next equation you asked so consider Vin > V1. TO get VLow
_Doubt_ : _We have already considerd V+>Vin to obtain Vout=Vh and named it as V1 now how can you again compare Vin and V1 to get VL. And how is Vlow consider as Vut? Please sir I'm stuck badly in this confusion_
Did u get the answer?
For understanding it Initial Assumption was made :- Vin < V + , then Vout = VH
Now, the output will remain VH till Vin < V . This is considered as V1.
Comment :- "On the next equation you asked so consider Vin > V1. To get VLow" . Yes because unless the Vin doesn't goes less than V1, the output will remain LOW only. We need to get the VH as output as well.
Now when Vin > V1 , then the output becomes VL ( Low).
Case 1 :- Voltage is set at VH > Vin . The output is low. (V1)
When Vin < VH the Vout is becoming HIGH.
In case of non inver schmit trgr why we can not put vin at + and feed back resistor on - with ground?
You mean to say like inverting configuration ??
The thing is Schmitt trigger is operated with positive feedback. That means based on input, the output is either + Vsat or - Vsat.
If there is negative feedback, then it's not a Schmitt trigger circuit. I hope it will clear your doubt.
Sir I have some doubts
Why we use positive feedback?
Does virtual ground concept act here too?
How can we fix a specific voltage as UTV and LTV?
Here we are using positive feedback, because we want the opamp in the saturation. That means it has only two output states. + Vsat and - Vsat.
And the virtual ground concept is not valid the the positive feedback. It is only valid with the negative feedback, when the opamp is operating in the linear region.
@@ALLABOUTELECTRONICS thank you very much for your valuable reply sir 🙏
Thank you sir,
But can you provide us with notes
In non inverting u interchange vL and Vh.. While calculating vi
For example my +vsat =10 volts if R1=R2 then upper thershold voltage is 5 volts when voltage at inverting terminal is more than upper thershold voltage we will get -vsat then voltage at non inverting terminal is -5 then voltage at inverting terminal should be less than lower thershold voltage right if we calculate this with gain=100 then vout =A(v^+ - v^-)
Sir ,why does not applicable for virtual ground concept in Schmitt trigger?
The concept of virtual ground is applicable only when the op-amp is operated in the linear region (with negative feedback). Here, in case of Schmitt Trigger, the positive feedback has been applied to the op-amp, so it is operating in the saturation region.
I hope it will clear your doubt.
@@ALLABOUTELECTRONICS tysm sir
At 1.32 in the video it's shown that the output voltage becomes zero if the inverting voltage is higer than non-inverting voltage...but you are giving -Vs supply...so the output should be a negatve value(probably -Vs) at the moment...
He doesn't say it becomes Zero, he says it becomes low voltage, (what ever the negative supply is)
Cab any one explain how he compared.. V1>0 with (R2/R1+R2) vin > -Vl(R1/R1+R2)
Bro, before and after, using schmit trigger waveforms I didn't find any difference ,can someone please explain me
Hello Hari, with schmitt trigger, the output if opamp is locked for certain range of input signal....
@@circuitsanalytica4348 ok thank you