This is the kind of education that should have stayed. They made a paralell between something you know and the new knowledge creating these examples. So much easier to absorb the basics this way, and after this you can go to the advanced part and understand that more easily thanks to this. Nowadays they teach you like you already know the basics well and that is where today's education fails.
Yes, Maty. You are wise and speak the truth. What has happened to us... it's like most things that actually worked have been forgotten. But not today! I watched it and R a better person 4 it. Cheers
Man, these old videos are so much better than the modern stuff you see in UA-cam. The right cadence, clear English, proper use of visual aids (even using more primitive ones like this are more clear).
just watched "the beauty of LC oscillations" and while the animations were great, I was losing my mind because the direction of the induced emf didn't change at the correct time when the current began to decrease... THANK YOU SOO MUCH !!!
If you want to get the navy (i think its navy) manual on electronics it's pretty cool and actually still relevant for learning stuff, it's readily available for download
@ 6:50 The coil becomes a voltage-source because the decaying magnetic field acts like a battery! My battery produces voltage, not energy! And so this magnetic field contains no energy. Faraday's law of induction is about changing magnetic fields and ... voltage.
A battery contains potential energy and similarly an induction coil stores potential energy due to magnetic field generated as a result of applied voltage.
I have a question 1) if the amplifier is used to strengthen the signal that is restoring the amplitude that is lost due to circuit resistance then why do we need a feedback circuit? Please explain? And if feedback is used to get the same signal frequency and phase, but isn't that the job of the LC circuit won't the LC circuit generate constant frequency signals ?
I believe I can shed some light on your question. To answer your first question, you're right, the amplifier is used to regenerate the energy losses in the LC (oscillator) circuit. The feedback circuit is required because without it, you would simply be amplifying the gradually decaying output from the LC circuit. The feedback circuit is what gives back the LC circuit the energy it loses due to its internal resistances. For your second question, the LC circuit's job is to provide the capability of generating constant frequency/amplitude signals, but without amplifier feedback to recoup loses, the output will decay away over time like the felt pen demo held in place by rubber bands. Hope this helps, cheers.
Because the first equation for Q was for the series resistance of the circuit. The second equation refers to any *parallel* resistance *across* the circuit, which must be kept at a high value to obtain a satisfactory Q for the L-C combination.
The only waves that will reinforce for a standing wave are 180° out of phase. It's a closed loop system that selects for those conditions. Great question.
@@tobiasgertz7800 thank you for The answer, Im not sure i understand what you mean by "... Selects for those cpnditions...". What does it exaclty means?
In the feedback loop the physical soundwaves have a speed through the air and they also have harmonics. There are more than just one fundamental frequency. The one specific frequency that fits inside the physical distance between microphone and amplifier is the one that has the least resistance to the loop and gets amplified. Positive reinforcement happens over and over again rapidly. There is necessarily phase shifting and harmonics in the system. The speaker isn't a perfect sine wave generator, and air isn't a lossless or homogenous medium. It all generated harmonics. One of those harmonics (different but related frequency) will appear as a phase shift.
Wrong.. Deluded That is not the reality of electron flow, which is current flow. If you were taught that, they would have explained that is termed 'conventional flow' thinking and not in accordance to reality.... I call it 'deluded'.
@@BTW... The problem is to mix up the two conventions: in high school physics lessons, during charging of the capacitor, the direction of the current is from the battery's + terminal to its minus terminal, whereas during discharging, the direction of the current is from the negatively-charged armature to the positively-charged one.
@@jakobjensen3424 But in a circle 2 points are both behind and infront of each other , there isnt a front or behind, both points are going toward each other, so technically this explantion doesnt make sense either way? and maybe why my brains starts to hurt when i see a diode in a schematic.
Yes made, today this is simple but at that time hardly someone know about electronics, it can be used against u by ur enemy to obviously you don't want your enemy to be educated as u
@@supremeleader5516 No. Just no. This video was made in the 1970s. The whole world knew about LC circuits already. This video was made, and labeled "unclassified" because it was not "classified". Many people here are mistakenly thinking this film was "declassified". That's different.
This video is a swiss cheese of theory needed to explain. While most things aren't completely explained a few details were wrong and the presentation completely failed to demonstrate what it has to demonstrate to the intended audience.
This is the kind of education that should have stayed. They made a paralell between something you know and the new knowledge creating these examples. So much easier to absorb the basics this way, and after this you can go to the advanced part and understand that more easily thanks to this. Nowadays they teach you like you already know the basics well and that is where today's education fails.
Yes, Maty. You are wise and speak the truth. What has happened to us... it's like most things that actually worked have been forgotten. But not today! I watched it and R a better person 4 it. Cheers
We still use it in europe
Man, these old videos are so much better than the modern stuff you see in UA-cam. The right cadence, clear English, proper use of visual aids (even using more primitive ones like this are more clear).
Y. Who knew are GR8T GR8T GR8T grandfathers were so smart?
I love the clear, concise and unadorned style of explanation here. Well done!
That old way of explanation is rare now days
Not rare at all, just really expensive now
Professors scares the students with COMPLEX MATHEMATICAL Physics and STUDENTS quit Engineering. DEMOTIVATIONAL system of education. LOL.
Yep, I like this old stuff too.
@@alakani Well it is rare because its expensive lol
I was a USAF Electronics Student. They did have some really good films for training.
just watched "the beauty of LC oscillations" and while the animations were great, I was losing my mind because the direction of the induced emf didn't change at the correct time when the current began to decrease... THANK YOU SOO MUCH !!!
as usual the us army with the logistic approach i thought i was gonna go insane thank you so much
Sir, you are truly a BOSS! You've somehow explained what I've found difficult for months 💕💕❤❤
If you want to get the navy (i think its navy) manual on electronics it's pretty cool and actually still relevant for learning stuff, it's readily available for download
Excellent video
Thanks for the knowledge 😊
Boy I went to college and didn't understand it like this.
Great explanations! Thanks!
Fantastico education on LC circuits n cost added by self resonance damping. Elegant comparison WITH flywheel n paper graphs.
Jussojuan surender singal
Start here: 4:53. Of course, 0.159 = 1 / (2.pi)
en.wikipedia.org/wiki/LC_circuit
Amazing explaination 👍
An LC circuit is A.C. A.C. is an LC circuit is an oscillator not a wave.
What could the motivation be for the one jagoff voting this video down?
He's a jagoff. Nothing can save him.
maybe he/she wanted the classified version.
Fell asleep at the helm and forehead hit the thumbs down button in the submarine.
this is a russian guy
I watched a lot of these training films and film strips back in 98 before they made everything confusing
Is the current flow direction correct when capacitor discharge? I think the current from the capacitor is clockwise when flip the switch to C.
solid example !📕🎺📖📚📐✏🔬
so how to build regenerative feedback circuit?
@ 6:50 The coil becomes a voltage-source because the decaying magnetic field acts like a battery! My battery produces voltage, not energy! And so this magnetic field contains no energy. Faraday's law of induction is about changing magnetic fields and ... voltage.
A battery contains potential energy and similarly an induction coil stores potential energy due to magnetic field generated as a result of applied voltage.
Why the actual explanations isn´t so that didactic ?
Shouldn't the LC capacitor be a non-polar capacitor?
I believe it doesn't matter which kind of capacitor you use
It must be a non polar capacitor. The induced oscillating current is AC. So a polarized capacitor will die. The symbol surprised me.
thank you
i use a whawha pedal for my fdd..
.
I have a question
1) if the amplifier is used to strengthen the signal that is restoring the amplitude that is lost due to circuit resistance then why do we need a feedback circuit?
Please explain?
And if feedback is used to get the same signal frequency and phase, but isn't that the job of the LC circuit won't the LC circuit generate constant frequency signals ?
I believe I can shed some light on your question.
To answer your first question, you're right, the amplifier is used to regenerate the energy losses in the LC (oscillator) circuit. The feedback circuit is required because without it, you would simply be amplifying the gradually decaying output from the LC circuit. The feedback circuit is what gives back the LC circuit the energy it loses due to its internal resistances.
For your second question, the LC circuit's job is to provide the capability of generating constant frequency/amplitude signals, but without amplifier feedback to recoup loses, the output will decay away over time like the felt pen demo held in place by rubber bands.
Hope this helps, cheers.
@@nikiopia Ooh okay thank you for the explanation😊
why did the quality equation get inverted at 16:08?
Because the first equation for Q was for the series resistance of the circuit. The second equation refers to any *parallel* resistance *across* the circuit, which must be kept at a high value to obtain a satisfactory Q for the L-C combination.
Пояснення дуже дотепне
1000th like
Why doesnt it cancel out in the mic and speaker feedback example? the phase shifting doesnt happen?
The only waves that will reinforce for a standing wave are 180° out of phase. It's a closed loop system that selects for those conditions. Great question.
@@tobiasgertz7800 thank you for The answer, Im not sure i understand what you mean by "... Selects for those cpnditions...". What does it exaclty means?
ua-cam.com/video/oZ38Y0K8e-Y/v-deo.html
Your englishv is good, but you won't need words to understand this one.
ua-cam.com/video/cnH2ltfW48U/v-deo.html
In the feedback loop the physical soundwaves have a speed through the air and they also have harmonics. There are more than just one fundamental frequency. The one specific frequency that fits inside the physical distance between microphone and amplifier is the one that has the least resistance to the loop and gets amplified. Positive reinforcement happens over and over again rapidly. There is necessarily phase shifting and harmonics in the system. The speaker isn't a perfect sine wave generator, and air isn't a lossless or homogenous medium. It all generated harmonics. One of those harmonics (different but related frequency) will appear as a phase shift.
👍
Wrong current flows from + ve to -ve
Wrong.. Deluded
That is not the reality of electron flow, which is current flow.
If you were taught that, they would have explained that is termed 'conventional flow' thinking and not in accordance to reality.... I call it 'deluded'.
@@BTW... The problem is to mix up the two conventions: in high school physics lessons, during charging of the capacitor, the direction of the current is from the battery's + terminal to its minus terminal, whereas during discharging, the direction of the current is from the negatively-charged armature to the positively-charged one.
6:05 In those days, did the current flow from minus to plus?
they are not using conventional current
they are depicting actual electron flow
Current has always been minus to plus, it's voltage that's from plus to minus.
@@jakobjensen3424 No... Current traditionally flows from positive to negative, although electrons flow from negative to positive.
@@piotrne Current traditionally flows from negative to positive. Because current is* electron flow.
@@jakobjensen3424 But in a circle 2 points are both behind and infront of each other , there isnt a front or behind, both points are going toward each other, so technically this explantion doesnt make sense either way? and maybe why my brains starts to hurt when i see a diode in a schematic.
Well I'm not scared of em anymore.
Amplifiers oscillate and oscillators amplify.
"Unclassified" so this simple piece of information was classified?
Unclassified just means public. It doesn't necessarily mean it was ever classified.
Yes made, today this is simple but at that time hardly someone know about electronics, it can be used against u by ur enemy to obviously you don't want your enemy to be educated as u
It should have been classified and it was.
@@supremeleader5516 No. Just no. This video was made in the 1970s. The whole world knew about LC circuits already. This video was made, and labeled "unclassified" because it was not "classified". Many people here are mistakenly thinking this film was "declassified". That's different.
Zajebiste
This video is a swiss cheese of theory needed to explain. While most things aren't completely explained a few details were wrong and the presentation completely failed to demonstrate what it has to demonstrate to the intended audience.
"1974"?!?! Looks more like 1944! 😂😂😂