#55: Back to Basics: Tutorial on LC Resonant Circuits
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- Опубликовано: 4 июл 2024
- This video builds upon the voltage / current phase relationships that were demonstrated in the previous video:
• #54: Back to Basics Tu...
to show how these lead/lag relationships give rise to the unique properties of series and parallel resonant LC circuits. The voltage and current waveform phases are examined, and it is shown how these waveforms combine at resonance. The result of this paper analysis is also shown live on the oscilloscope. These simple circuits can be used to create frequency selective networks which are useful in filters, oscillators and other AC circuits.
Show Notes:
www.qsl.net/w2aew/youtube/LC_R... 
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You are amazing! Showing the hand drawn diagrams, the actual circuits and the scope! All in 10 minutes!
Where were YOU when I was in college? :))
God bless you.
I hope as many students as possible find this channel.
Thank you SO MUCH for this! I've been struggling to understand resonance and none of the other videos I have watched have cleared it up for me.
I studied 3 years of technical school and 5 years of engineering and never saw so better explanation.
Don't know why to spend years doing calculations when a practical lesson like this one sace years of time
You've made me do one thing my teacher was not capable to do through the whole semester: make me think over what we were studying. Thank you for that, honestly.
Love your video, perfect explanation, using the scope and the theory! I’ve been studying this for years and have never had such a clear and concise explanation. Thank You!!
Watch many of your videos and they are amongst the very best - thank you. Despite the excellence of your material I find it useful to replicate your demonstrations - there is even more learning to be found! This one for example - at resonance the source is effectively shorted and mine doesn't like that. Also haven't found a way to hide a trace on the scope that is used in math but not needed on the display. Excellent skill building experiments. Brilliant. I encourage anyone to try reproducing what seem at first to be simple circuits.
4:20 Seeing this frequency dependancy of impedance in an oscilloscope is just soo cool.
My "teacher" in Uni made a complete dogs dinner of this despite having all the resources of a modern Uni at his disposal.
You totally nailed it with some graph paper, a scope and $0.000000002 in components.
Maybe you should share this video with your UNI teacher, and your fellow students!
This guy has some of the best instructional videos on RUclips. Very well explained and to the point.
That's awesome I was struggling to understand why one lagging the other mattered and then you went "above and beyond" the resonant frequencies skewing and squashing the waveform. Outstanding, I have the next step ahead of me!
I never got this intuitive view of series and parallel resonance when I studied circuit analysis. Thanks so much for this great lecture.
I've just started looking at tuned circuits as part of prep for a licence exam and found this a very helpful perspective to understand why the basic LC circuits behave as they do.
Awesome video. Your explanation is loaded with detail but yet very simple to understand. The series LC circuit is exactly what we use on the railroad for our crossing circuits. Each RR crossing has it's own frequency and there is a series LC just as you described at either end of the approach to terminate the circuit and define the limits of the approach. This allows multiple crossing approach circuits to be stacked upon one another, each with it's own frequency and tuned termination shunts (the series LC). It also allows our DC signaling pulses to pass through unimpeded.
Excellently explained, finally understood this concept: at resonant frequency the resistance/impedance is zero, effectively acting as a short! Perfect!!!
I agree - pure gold!
By far the best and clearest videos on these subjects on youtube.
To the above suggestion on filters I wish to suggest adding 'back to basics' videos on the following:
1. Ground - difference between DC/AC circuits, floating ground, ground loops and how to avoid them, best practices and the how and where to use isolation transformers and how they work
2. RC oscillators.
3. Which capacitor/inductor types are good for which applications and which values to use.
Since a long time i am searching for hardcore electronics hardware vedios, your vedio are amazing keep making vedios on more complex electronics hardware
Clarity , instruction and demos are simply fantastic. Thank you so much . Had trouble fully conceptualizing rc and resonances until I saw this. I love it . I would love to understand more about the application. You mentioned at resonance, useful things can be done . Would love know more about this is used in application . Thank you . Subscribed, and liked
Thank you for this. It's the clearest, most intuitive explanation I've seen.
possibly the best video demonstration of a LC resonance.
Yes sir! This helped out a lot having your explanation coupled with the oscilloscope and your diagrams. This tied some loose ends in the education. Thank you!
Aww haa! Now I understand the why of the left channel fault on a tape machine I repaired. I knew something was off with the left side bias trap by intuition. After looking at your video, I was able to confirm that the bias trap had drifted off frequency by 12KHz. Really cool stuff you've offered. Thanks. Now, as to why I've chosen tape machine repair as a hobby, I'm afraid there's no help for it. Actually, I try to repair everything :-)
I love this channel ... this helps us to learn theory and working model at the same time ... Thank you so much.
Looked forward to watching this video all day! Thanks!
This is one great explanation of LC circuits! Just the right mix of science theory and experimentation.
Excellent video. As a lapsed electrical engineer it makes me want to watch a few more. I was intrigued by the pencil drawings. I never thought that they would work so well in a video, but they do.
Your presentation is short and sweet for quick review. It is easy to follow. Thank you.
Very interesting tutorial lesson of the series and parallel connection of capacitor and inductance circuits. Thanks for the nice video.
Very very helpful in understanding Series and Parallel LC circuits! I'm excited to get home this evening and build one on my breadboard.
Great job Alan. I love these basics videos! Keep up the great content!
Studying for my physics lab, this was really helpful. Thanks a lot.
thanks a lot for these sir! Back to Basics series are amazing!
Excellent tutorial on the topic! I really enjoy your videos. Thanks!
I'd like to see a series on LC circuits and filters. Fundamentals to radio building. Excellent work!
It's a pleasure to learn from your videos! Thank You!
Thanks very much for this, excellent video!
To feed the parallel circuit from your signal generator did you include a series resistance? I have been experimenting with this recently and wonder if the 50 ohm output of my generator is interfering with the tank circuit. I do not always seem to get results that correlate with the relevant formula.
Excellent method for finding resonance.. thank you for posting!
Thank you Allen. I thought I've watched all your videos but every once in while a "new" old one pops up. :/ I've been playing with electronics my whole life, Science Fair kits, fixing VCRS, resoldering broken jacks, I even wanted to be go to school for EET) but it wasn't until I started watching your videos that things clicked. I love your back to basics keep them coming :). Btw. Your lucky I'm not your next door neighbor I'd be bugging you everyday.
There is a link to a complete index to all of my videos on the main channel page. You can use this to keep track of the ones you've watched.
Awesome and effective explanation. Thanks.
The "open circuit" scenario gives me a better perspective of antenna traps... thanks Alan.
Awsome video!!! Great job explaining with the visuals.
awesome. i like your explaining style very much.
Hi, I love your video series: the format if a piece if well-explained theory followed by a simple practical demonstration is really great. Thanks for making these available...I'm really enjoying working my way through the ones you have already done and looking forward to new ones.
A question about this particular video: am I right in thinking that this will only work if the values if L and C are the same (e.g. 220nH and 220nH)? This is the only way that the impedences will be equal at the freq?
Amazing explanation. Thank you!!
this would have helped me score good in electronics in when i am in bachelors 10 years back. :).. still i believe this is one of the best way of explaining LC circuit.
Very useful video for understanding the concept of dual resonant solid state teslacoils
Thank you very much. Very clear explanations. Have subscribed the channel.
Thanks for a another brilliant video, pure gold. As a sugestion how about a 'back to basics' series on filter circuits?
Hey thanks for the quick reply, changing my probe to 10x mode and adding a 110 ohm resistor produced much better results. I'll remember to double check my impedance values when making LC circuits. Thank you for your insight!
Wonderful amazing explanation simple too!
Thank you...
In the parallel circuit, you could put 1 Ohm resistance in series with L and C (on the ground side) to show the phase relation between the currents. Once again, they are always out of phase and resonance is when their amplitudes are equal -- V/X_L = I_L = I_C = V/X_C. Cross multiply and cancel V to see X_L = X_C once again at resonance.
Thank you!
Cheers,
Dave
Nicely explained video. Thank You
Thanks a lot ! This video helped me !
I have a question, it seems like you made a home-made frequency generator (who is powering the LC circuit)... Could you tell me how is it made ? (I'm planing to make a high power frequency generator to power a big LC circuit) Thank you.
Nice video. I need a 2KHz sine wave oscillator to drive a car buzzer. Do you know if there is an IC out there I can use other then 555?
Great explanation. I have seen several but this one is the best so far. Could not ask for more. My marks would have been much higher if you were instructing.
clearest explanation on RC resonance circuit. beat textbooks.
Awesome vid. Great work and explaination
This is really helpful thank you. I am thinking what happens in a mixture of series and parallel? I will have to get a scope.
Great lesson!
Very nicely explained
Superb Explanation!
Excellent video. Thanks much.
Outstanding video...thanks for posting
Humm...deciding the ratios of inductance and capacitance (out of the many possible combination's that would be resonant at a specific frequency) - would be a good point to begin to talk about the "Q" of these combo's?
nice and clear, thanks doc!
Great video, Alan! I'm curious, since it's possible to have a series LC circuit be a band-pass filter, and a parallel LC circuit doing the same, which is the preferred configuration? My instinct says a parallel LC circuit, but I can't back that up.
It really depends on the surrounding circuitry and how the resonant impedance is utilized. The parallel LC will look like a high impedance at resonance and the series LC will look like a low impedance at resonance.
Great tutorial, thank you 💐🙏
8:00 so this would make the 2nd circuit a band-stop filter would it? At resonance, the parallel circuit could short to ground maybe through a resistor.
giving you a thumbs up mister!
Alan. i tried to replicate your experiment in LC resonance...when i did the math in my scope..saw the two signals subtracting from each other...the coil minus the cap. voltage as a matter of fact was perfect....so far ok..but when l increased or lower the frequency could not see the increasing or decreasing efects on this two volatages as i expected and supose to happen..using an fg 085 sig gen , and a two channel owon ds 6062 scope..do i need another conection or something else to do this test? apeciate you help thanks...kp4 bp.....Ruben...
this channel seems cool! subscribed!
Thanks...now i really understand how a lc circuit works....
Nice demo. Thanks!
Perfect. Thank you!
Hi there. i was wondering, that instead of a signal generator, if i hook up an antena will i be able to resonate the circuit at a particular frequency to get a signal? also do i need to amplify the signal before i channel it through the tank circuit? i am working on a radio controller right now and i really need to complete it before my holidays are over.please reply soon.
and nice work (^_^)
Great video !
Thanks so much Teacher....very helpful!
Hey, great video! Really appreciate!
Exlent sir wow, I never understood before u, thanks thanks thanks
still learning all this stuff.. see if iam on track here.. say for regen or sw rx. the LC say resonates at 5mhz. the radio will then rx above and below 5mhz? or it sums or something.. i build or try to regens and clones of old kits. like the ten tec 1253 i think it is.. the multi band kit from few years back... iam havin a issue wraping my head around this i think lol ..ps edit.. should i use a freq gen to messure the LC ? i see some using a function gen..
In the case where you have two coils to transmit energy (like a wireless charger), What consequences does it have on the yield when you increase your capacity ? Is there any advantage to have a great C and a smaller frequency or the oposite (If the inductance is the same) ?
It would help me a lot :) (and sorry for my english)
Thank you, this was a great video ))
Thank you. Im just started getting into RF and didn't understand how the local oscillator selected the frequency from the antennae in the tuner circuit. I understood that the local oscillator had a resonant frequency it oscillates at but i didn't see how it discriminated out all the different incoming frequencies from the antennae. Now I think I see that the parallel LC circuit will short the unwanted frequencies to gnd and effectively pass-through the selected frequency along the signal path by virtue of it effectively acting as an open for that frequency. I'm sure I don't fully understand it still but this was helpful. Thanks.
That is part of it (tuning the front-end bandpass filter), but the main thing that involves the local oscillator is the mixing circuit. This video might help: ruclips.net/video/Vf06HSR4LdY/видео.html
Thumbs up!... Can the circuit be powered with a magnetic field through the coil, with inductive coupling
Thank you so much, This creates a question about my hand crank generator.
I used a four diode bridge rectifier with a capacitor to smooth out the AC and now I wonder if I should add an inductor....?
Will the inductor stop all current? or will it effectively and totally smooth out the AC for a good clean DC.
Any help appreciated
Harold
PS. You said the cancel each other out like an open circuit but then you said it would be good for filters?
No need for the inductor in your case of power generation.
For the filter - picture the LC tank circuit in parallel with a load. At the resonant frequency, it looks like an open, so the load gets all of the signal. At other frequencies, the LC will shunt some of the signal away from the load. This is one possibly implementation.
Hi Alan, I got the same set up LC in series and the circuit goes in to resonance at 216KHZ, when I switch to parallel it goes out of resonance and my function gen. has up to 20MHZ where I can see it wants to go in to resonance but don't have any more range. my L is a hand wound wire and my C is .01uF. as per calculation it should be around 54.292 uH but with my LCR meter is 27uH. any idea why in parallel it doesn't resonate?
i have a hv driver pulsed DC and want to find resonance in my coil. I dont have any high voltage caps yet to make a lc circiut at hv . so i kinda wanted to practice with my singnal generator.what i wanted to see is what if we can collect bemf at resonance. so my SG hooked up to a bedini circiut i would need to throw a capacitor in parallel with my coil right? can you do a video maybe on the math to calculate which size caps i might need?
I'd like to build a similar circuit as the one you show in the video and plug in the oscilloscope. can you give more info about it, like capacitance and inductance values, AC voltage and frequency ? Thanks.
Actual values aren't critical, simply use what you have and calculate the resonant frequency.
Thank you for the video sir
Greetings, I"m trying to reproduce your experiment however I"m not having much luck reproducing the results you got for the series LC, aside from a very small drop in Vpp around about 10 mV. I'm using a 127mV sine wave generator connected across the inductor and capacitor in series and connecting my probe across the series circuit. What am I doing wrong?
Is it hard on your signal generator (even momentarily) to see a zero impedance as you move through the resonant frequency in these demos?
very interesting to note that parallel acts like an open circuit but yet a very real a/c field exists.
Very good. So if I want to select L and C for a given resonant frequency, is there a formula to determine the ideal values for L and C without resorting to trial and error ? Thanks.
The formulas are on page 2 of the video notes:
www.qsl.net/w2aew/youtube/LC_Resonance.pdf
There are an infinite combinations of L and C for any given resonant frequency. Usually you'll start with a capacitor or inductor that is common or that you have on hand, and then calculate the remaining component value. If that results in an unreasonable or unrealistic component value, then adjust your first selection and repeat.
Hi, great video. I only have a square wave generator and an oscilloscope with one channel. I would like to use is to find the Inductor value. Is it possible? Thanks a lot.
Sure - check out this video:
ruclips.net/video/74fz9iwZ_sM/видео.html
I'm in need of a parallel LC with as high an impedance as I can get. So far 17khz resonance doesn't have much impedance/resistance. Do I need to be aiming for MHZ range for any substantial impedance?
I’d be curious to see if one could find the resonant frequency of aTesla coil using this method
Could you put some figures to the frequencies, voltages and currents involved, and as someone else has asked, do a video on designing the inductance and capacitance values for a given resonance please? In particular I am interested in how to decide on the the value of capacitance against inductance, as there are many variables that seemingly give the same resonant frequency. Thanks Alan, great video again!
Can you give a run down on your test gear - Scopes, sig/freq gen,spectrum analyser etc
Thanks
Very good video