L/C Resonant Circuits with Ideal and Real-World Components (056)
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- Опубликовано: 13 мар 2023
- Resonant circuits are everywhere in our radios. There would be no radio communication without it.
In this video I am going to show you what makes a circuit a resonant circuit. I will answer the question, "How does a resonant circuit behave at its resonant frequency as well as below and above its resonant frequency?"
I will address both series resonant circuits and parallel resonant circuits with both ideal cpacitors and inductors as well as real-world capacitors and inductors.
This is NOT going to be a math intensive video, but I have provided a link to a math sheet, below.
Promised Octave Links:
DOWNLOAD the Application: octave.org/download
The Octave file for this video: drive.google.com/file/d/1iLiO...
Promised Math Sheet Link:
drive.google.com/file/d/1BxyA...
Time Markers for Your Convenience
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00:05 Introductory Comments
01:32 What am I going to do here?
02:22 What makes a circuit resonant?
03:20 Impedance of the Ideal Capacitor
04:04 Impedance of an Ideal Inductor
04:57 Series Resonance with Ideal Components
05:11 At the Resonant Frequency
06:50 Below and Above the Resonant Frequency
08:47 Parallel Resonance with Ideal Components
08:54 At the Resonant Frequency
11:55 Below and Above the Resonant Frequency
13:53 Real-World Components
14:59 Capacitor: A Basic Real-World Model
16:55 Inductor: A Basic Real-World Model
18:36 Math and the Models
19:14 Resonance with Real World Components
20:15 Series Resonance with Real-World Components
21:31 Parallel Resonance with Real-World Components
22:44 Final Comments and Toodle-Oots
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One of the best explanations I have ever heard! Thank a lot
Thanks, man! I'm so glad you found it helpful! 🙂
Ralph, this is extremely well done. Bravo! The data presented here should be a central focus point for those holding an Extra class license. Imagine what the amateur bands would be like if more people studied these basic concepts that ALL radio transmission employs, instead of jamming each other with rude comments or playing music. Thank you for your instruction and expertise. 73 OM
Thanks, man!
An antenna tuner presents the complex conjugate impedance of the antenna-feed line mism. That is, the sign of the reactance is reverse. So the tuner forms a resonant circuit with the antenna-feed line mismatch. Because it’s resonant, the power reflected back to the tuner is turned around and reflected by the tuner back to the antenna. So most of the energy reflected back from the antenna mismatch gets re-reflected back to the antenna. Of course, some of the power is lost due to feed line resistance.
In depth and well explained dissection of the theory. You put a lot of work into these videos. And I appreciate that you demonstrate the theory and math. This is uncommon from other ham channels. Thank you for the video.
Thanks! I am enjoying the process, too! By God's grace, I'll keep the videos rolling out.
great video - I`v been building LC resonant circuits for year and had a lot of fun doing so, one LC circuit placed in side another LC circuit then pulse some high voltage motivation through the outer LC circuit and there you go, some bloke back in the 1890`s came up with the circuit diagram, his name is on the tip on tongue..... :-)
Thanks, man! :-)
Thanks for this detailed video! 73.
You are very welcome, my friend! 🙂
Always Great Videos.....Tnx,
N2FH
Thanks! ... and you are welcome! 🙂
Great stuff - thank you!
You are very welcome! 🙂
👍Thank you sir.
You are welcome! 🙂
sir i have this doubt for very long time.
In parallel LC circuit, at resonance condition the impedance is infinite.
At this condition circuit acts as an open circuit.
So, the current at resonance is zero.
The intermediate frequency transformer and rf transformer how does it work.
it is like a (primary parallel LC circuit) with secondary.Thank you sir.(vu2knd).
@@eie_for_you
@@ornithopterindiaA very, very good question. If we are looking at the circuit from the outside, like a black box, yes, it looks like an open circuit. However, we have a very different story if we dig into what is going on inside the individual components. The capacitor is charging and discharging. It is discharging through the inductor which means that there is current passing through the inductor creating a magnetic field around the inductor. Once the capacitor's charge is exhausted, the current through the inductor drops to zero, the magnetic field collapses and a "reverse EMF" is induced in the inductor due to the collapsing magnetic field. This produces a voltage across the inductor which charges the capacitor in the opposite polarity as before. Once the magnetic field of the inductor has completely collapsed, the voltage that was present across the inductor goes away and the capacitor now begins discharging through the inductor again...the cycle continues. If we had perfect components and there is no energy removed from the system by surrounding circuitry, then this would go on forever. However, neither of these things are true, so the effect would decay over time. Hope this helps to dispel your doubts. Thanks for asking! 🙂
Yes, would be interested and thankful for octave models for these concepts using passive components. Yours was a perfect explanation. What ended up being the self resonant frequency at this point 21:30?
How would this model change if I replace inductors with gyrators (using op-amps) as synthetic inductors?
I wish I could answer these questions. I did not note the self-resonant frequency at 21:30.
I've never worked with "synthetic" inductors, using op amps, so I am without an answer for this one. Sorry.😔
Also, Love the John 3:16 !!!!!!
Best news in the world!