Thanks again, very nice explanation of the concept and the impact. I have used hysterisys in the past for control circuits but this refreshed the basic concept for me. Your videos are the day starter for me and I beleive for many others as well keep up the good work and have a good day
@kd4nc
2 жыл бұрын
Great Explanation of Hysteresis and how to achieve it… I knew what hysteresis is, but didn’t have the perspective of how I should use it in a circuit design or how to achieve it… Thanks! Great Video….
@RexxSchneider
2 жыл бұрын
Just a couple of points: first, the need to compare voltages at or near ground resulted in comparators being produced that would include ground in their common-mode range, which allows zero-crossing detection from a single-supply circuit. The LM393 is a classic example, although it needs input resistors to limit input current if the input can fall more than 0.3V below ground. Second, you only normally need to aim for a few 10s of millivolts of hysteresis, so you don't need massive amounts of positive feedback, and if the output swing is not symmetrical with respect to the comparator crossing-point, then another resistor can be added to move the feedback level so that the hysteresis becomes symmetrical about the crossing-point. In the circuit shown, I'd suggest something a bit more than 100K from the negative rail to the positive input would give an output duty cycle nearer to 50%.
@IMSAIGuy
2 жыл бұрын
all correct, this was an educational video and I exaggerated things..
@electrosheeps6718
Жыл бұрын
Hey IMSAI Guy! I have been watching your videos for a long time. And for the first time I decided to leave a comment. Always wondered why you have so few views. You present very interesting material. And it dawned on me that, apparently, you are very smart, and there are not many smart people on earth :) And, perhaps, by the fact that I watch you, I will also become a little smarter. And if in essence, then you managed to explain very clearly and intelligibly about the problem of the ringing of comparators.
@urlkrueger
2 жыл бұрын
Hmmm, You started out your explanation talking about ground and then changed to talking about noise on the input signal, plus I also noticed you didn't have any bypass capacitors in your circuit so is noise generated by the comparator switching states where you were originally headed? If I have a comparator laying around I'll have to check that out.
@IMSAIGuy
2 жыл бұрын
the noise might be ground or might be signal. both cases are good to use hysteresis. good bypassing will help of course but never get rid of all of it.
@artursmihelsons415
2 жыл бұрын
Nice! 👍 I noticed comparator ringing problem few years ago, but never thought about solution, because, it wasn't important in that case.. But it's good to know solution.. 😉
@pr45t_dm
2 жыл бұрын
thanks for explanation. really nice video..
@jbrown468
2 жыл бұрын
That was really helpful and informative. Thanks IMSAI Guy!
@tvelektron
2 жыл бұрын
Thank You, a lot of new information 😄
@Bobo-ox7fj
Жыл бұрын
Very well explained.
@joeteejoetee
2 жыл бұрын
EXCELLENT EXPLANATION !!!
@Retinatronics
2 жыл бұрын
These videos are great! Thank you.
@guesswhotoo6
Жыл бұрын
Hysteresis does not help if the interfering signal is faster than the propagation delay of the particular chip. Essentially inside the propagation delay time you don’t have any hysteresis. This is most important for very fast ic’s.
@jstro-hobbytech
2 жыл бұрын
Very cool. Thank you.
@AnalogDude_
Жыл бұрын
How about if your comparator has the negative pin to a zener determined trigger voltage and the positive pin is the input, i saw someone use a 22pF cap from the output to the positive pin. Does that help? i have used that as wel in a circuit and the logic behind that, a CD4013 does what it supposed to do, no hesitation or ringing. But on a forum they mention i should use positive feedback. According got you, i could do this if a voltage divider is used instead of a zener, bind a 10K resistor back to the voltage divider.
@AnalogDude_
Жыл бұрын
Would you show what happens if you have a 22pf capacitor over the LM393, a reference voltage on the inverted pin and the 22pF from the output to the non inverted pin while playing with a voltage divider(potmeter) on the non inverted pin. To see if this Hysteresis still occurs. i just tried, went down to 50nSec timing with my scope, it seams to have a "slope" with the tiny capacitor, but i can't replicate your situation of Hysteresis with the LM393 while playing with the potention meter, slow or fast.
@nubin.stanley
2 жыл бұрын
Great video! :) I have a question about the scope though - How is the MSO5000 ? Responsive ? I also read that it has quite high front-end noise compared to the Siglents... Is this too much of a problem ? :)
@IMSAIGuy
2 жыл бұрын
It is a fast and sensitive scope, so I does pick up a bunch of noise. I don't think that makes it bad though. just too good. here is my scope: kzitem.info/news/bejne/xpelro2Nkn6DiWU
@nubin.stanley
2 жыл бұрын
@@IMSAIGuy Hey, thanks for the reply. When purchasing this, did you happen to compare it to the Siglent SDS2104X Plus? :)
@IMSAIGuy
2 жыл бұрын
@@nubin.stanley no
@nubin.stanley
2 жыл бұрын
@@IMSAIGuy Ok, Thank you. 😊👍
@bobdoritique7347
2 жыл бұрын
Merci.
@goaway2174
2 жыл бұрын
Thank you! That’s actually a triangle wave though not a saw tooth wave!
@IMSAIGuy
2 жыл бұрын
depends on the saw 😎 I have used a triangular file to sharpen the ones I have
@christopherventer6391
2 жыл бұрын
@@IMSAIGuy I also came to the comments to mention that. Not sure if the convention is different in different fields, but an increasing ramp-shaped wave is a sawtooth in music applications (a falling waveform is called inverse or reverse saw) and a symmetrical waveform like this is a triangle.
@christopherventer6391
2 жыл бұрын
@@IMSAIGuy Great video, by the way, though. This is giving me a lot of musical application ideas.
@marcodoria
2 жыл бұрын
Thank you very much for the content you release! Would really like to talk toul you and know a bit more about your background! Thanks again and greetings from the Azores, Portugal!
@IMSAIGuy
2 жыл бұрын
I don't talk about myself much. What are you interested in learning
@marcodoria
2 жыл бұрын
@@IMSAIGuy, your professional background and path in electronics. Thank you!
@IMSAIGuy
2 жыл бұрын
@@marcodoria degrees in physics and math. 10 years working in electronics (circuit design and management) 35 years working in optics (LEDs, cameras, displays) all of my electronics knowledge is self taught
@marcodoria
2 жыл бұрын
@@IMSAIGuy, thanks! Keep them coming, please!
@roelandriemens
2 жыл бұрын
Great explanation again. I am starting to like analog electronics more and more after 40+ years of working with digital mostly. One question: Why doesn't the output swing between + and - 12 Volts?
@IMSAIGuy
2 жыл бұрын
the output is open collector so it will swing to whatever voltage the pullup uses
@guessedUK
2 жыл бұрын
It's because the emitter of the BJT open collector output is connected to chip ground (via a low value resistor).
@roelandriemens
2 жыл бұрын
Thanks, I missed that. Perhaps I shouldn't watch these very interesting videos when I have to go to bed. 😴
@karlramberg
2 жыл бұрын
Could you do a video about how microprocessors/ electronics detect edges?
@IMSAIGuy
2 жыл бұрын
ok
@--JYM-Rescuing-SS-Minnow
2 жыл бұрын
I feel like U'r describing coffee? robust in nature! 10X is a serious performance gain! imagine each X/time equals 100%. this would be a 1000% decrease in latency! I hope I'm not going 2 spoofy on U...but wow! I gota try that!! 🤡
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