You are amazing! Showing the hand drawn diagrams, the actual circuits and the scope! All in 10 minutes!

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

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!!

Where were YOU when I was in college? :)) God bless you. I hope as many students as possible find this channel.

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.

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.

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.

@w2aew

8 ай бұрын

Maybe you should share this video with your UNI teacher, and your fellow students!

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.

This guy has some of the best instructional videos on KZread. Very well explained and to the point.

I never got this intuitive view of series and parallel resonance when I studied circuit analysis. Thanks so much for this great lecture.

Since a long time i am searching for hardcore electronics hardware vedios, your vedio are amazing keep making vedios on more complex electronics hardware

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!

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 :-)

Excellently explained, finally understood this concept: at resonant frequency the resistance/impedance is zero, effectively acting as a short! Perfect!!!

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.

4:20 Seeing this frequency dependancy of impedance in an oscilloscope is just soo cool.

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.

Thank you for this. It's the clearest, most intuitive explanation I've seen.

Your presentation is short and sweet for quick review. It is easy to follow. Thank you.

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!

I love this channel ... this helps us to learn theory and working model at the same time ... Thank you so much.

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

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.

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.

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.

@w2aew

9 жыл бұрын

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.

clearest explanation on RC resonance circuit. beat textbooks.

Very very helpful in understanding Series and Parallel LC circuits! I'm excited to get home this evening and build one on my breadboard.

Studying for my physics lab, this was really helpful. Thanks a lot.

Very interesting tutorial lesson of the series and parallel connection of capacitor and inductance circuits. Thanks for the nice video.

Excellent method for finding resonance.. thank you for posting!

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.

@w2aew

Жыл бұрын

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: kzread.info/dash/bejne/iJpkmKqMgpeylLw.html

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.

I'd like to see a series on LC circuits and filters. Fundamentals to radio building. Excellent work!

The "open circuit" scenario gives me a better perspective of antenna traps... thanks Alan.

It's a pleasure to learn from your videos! Thank You!

Great job Alan. I love these basics videos! Keep up the great content!

Very useful video for understanding the concept of dual resonant solid state teslacoils

thanks a lot for these sir! Back to Basics series are amazing!

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.

I can not express the importance of this video for those want to learn electronics. once you understand this circuit then you can understand electronics.

@bobcocampo

4 жыл бұрын

What is the application in electronics?

@gammaraymonkey

4 жыл бұрын

@@bobcocampo it determines frequency. When you turn your car radio dial, you are changing the values of a LC circuit to the same frequency of your desired radio station.

Awesome and effective explanation. Thanks.

Exlent sir wow, I never understood before u, thanks thanks thanks

Great lesson!

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 tutorial on the topic! I really enjoy your videos. Thanks!

Thank you very much. Very clear explanations. Have subscribed the channel.

The Potential difference of the capacitor or the potential difference of the inductor is what is causing the time/phase delay. A Resistor doesn't have a potential difference on both sides of the resistor component but when you apply a voltage/current to it but when applying a voltage/current to a capacitor or inductor the potential difference takes TIME or a time interval for the potential different to be ZERO or equal on both sides of the component . This Potential difference is what is causing the phase angle?

👍Thank you sir. sir i have this doubt for very long time. if parallel LC Resonant circuit will not consume any current. the intermediate frequency transformer and rf transformer how does it work? it is like a (primary parallel LC circuit) with secondary.(vu2knd). sir your answer very very valuable information for hams and RF community.

awesome. i like your explaining style very much.

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!

when calculating the output power of an LR , LC, or LCR circuit the formula is V X LR = Wattage? V X LC = wattage? Because if you apply an AC waveform at a certain peak/peak voltage how can you calculate the outputs true power, reactive power VAR, absolute power VA of LR, LC, LCR networks?

I noticed at 6:20, you mentioned that the current flowing through a parallel LC circuit is the sum of the current flowing through the L and the C. I realize that this is just a back to basics explanation, but to add a "dose of reality" and peel back one more layer of the onion, so to speak, at resonance, the current flowing through the LC circuit is only a small fraction of the current flowing through either the L and the C. Most of the current is bouncing around "in the tank", and only a small current is needed to keep the tank active. This is key for power factor correction for large induction motors, such as blower motors or compressors in HVAC units. For additional explanation, see kzread.info/dash/bejne/rIqDy8SkiMjAo5s.html.

This reminds me a bit of Uncle Doug. Classic. Thanks.

very interesting to note that parallel acts like an open circuit but yet a very real a/c field exists.

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?

Thanks for a another brilliant video, pure gold. As a sugestion how about a 'back to basics' series on filter circuits?

giving you a thumbs up mister!

Wonderful amazing explanation simple too! Thank you...

Awsome video!!! Great job explaining with the visuals.

cheers from INDIA. can you pls make a video on foster seeley FM demodulator. your explanation is really great and is enhancing my knowledge. thank you

Thank you! Cheers, Dave

Try to make a back to basics of capacitors and inductors "complex impedance" because when a variable DC voltage is applied to either a capacitor or inductor their complex impedance changes, why does it change? I think they use this often in oscillator circuits and tuning circuits to change the pitch & resonance frequency by using a variable DC bias voltage to vary the capacitor or inductors complex impedance. What would be the best water analogy for a capacitors and inductors complex impedance?

Thank you!

Thanks...now i really understand how a lc circuit works....

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 and clear, thanks doc!

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 video !

By this logic, wouldn't a resonant transformer appear to the power supply as a "short circuit" when opperated at the resonant frequency?

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..

when the impedances are equal, does it not lead to voltage magnification ?

Superb Explanation!

So does the power source for the circuit HAVE to be AC? What about a circuit that uses a standard 9v battery? How would you make the LC circuit continually resonate then? Would you have to first create an oscillating dc circuit, like PWM?

@w2aew

2 жыл бұрын

An LC circuit won't oscillate on it's own. You'd need to "ping" it with a signal to cause it to ring (much like striking a bell).

Great tutorial, thank you 💐🙏

I was hoping to see the phase shifts above and below resonance

this channel seems cool! subscribed!

Thanks so much Teacher....very helpful!

hi there im using an owon scope mod 6062,but cannot reassembly this experiment,...using .1 microfarad cap ,and 150 mh inductor..and 1300 hertz freq...do i need a 3 channel input scope?

@Liviu75tx

4 жыл бұрын

You can use a two channel scope but will have to do the math yourself.. Measure the peak-peak for each channel and find the frequency where they are equal.

@rubenespada8117

Жыл бұрын

@@Liviu75tx

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!

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.

Very nicely explained

Perfect. Thank you!

Outstanding video...thanks for posting

When I take over the world historians will point to this video as the catalyst for the expression of my evil genius.

I’d be curious to see if one could find the resonant frequency of aTesla coil using this method

Hey, great video! Really appreciate!

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?

Awesome vid. Great work and explaination

How come when I do this with calculated value for 35khz of 1.2uh and 2.2uf I get 9 megahertz vale for the signals to do what you did??

@w2aew

3 ай бұрын

You may want to check your math. A 1.2uH inductor and a 2.2uF capacitor will have a calculated resonant frequency of 98kHz.

Thank you for the video sir

Excellent video. Thanks much.

How would you drive energy into that circuit using a transistor?

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...

Thank you, this was a great video ))