I have learnt a lot from the you-tube videos on electronics. I hope to learn more from the tutorials. I am grateful and will share the skills and knowledge with students and other teachers
Thanks CameramanLink Your welcome. It fits nicely with the preceding video. This basic electronics, is in everything electronics in the passed, present, and the future. And that is because we did not make the rules, we can only use them.
Sir, I've been following you since the beginning of 2020 and have been cherry picking videos of interest to me from time to time. Now that I've retired, I am going through each one of them because I thoroughly enjoy them. I've been meaning to write this for a long time now and don't know if you'll ever read this but your illustration of electronics technology and principles is extraordinary. If the inventors and discoverers, of past and present, of electrical/electronic theory/tech., ever needed an illustrator for their work, you would be their choice. Thank you and God bless you for sharing your knowledge with the world.
Thank you very much. When I started this CZcams site I wondered if anyone would be interested. I taught and developed software courses for a large company, for over ten years. If I had not taken that job I may not even have a CZcams site. Or write two books. I appreciate you taking the time to send me a comment. I do have a free ebook, it's in the ABOUT. Here is the download link. The password is 'allamericanfiveradio' . drive.google.com/file/d/1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp/view?usp=sharing
Thanks hedwig85 The frequencies are from about 100,000 to 250,000 Hz, and that is to keep the oscilloscope from strobing on the video. The capacitors are all 0.0022uf. That value of capacitor shows the change that I wanted to show on the oscilloscope without changing the scales on the generator. That makes the video run smoother.
The I.F. tanks coil and capacitor are chosen for a very high Q. Usually the adjustment is made with a variable capacitor or variable coil. It would be best to vary both for peek, but that would cost more for a little bit better performance. And what you are looking for on the oscope is the highest output at the intermediate frequency. Yes tanks can have more than one coil, the coil can be tapped too.
@RadioDude1969 451.9kHz is the resonant frequency. The AM band is about 550kHz-1600kHz, I would try for a resonant frequency about in the middle, like 1MHz. See if that works better.
A parallel resonant circuit will have maximum impedance at resonance. The function generator has an output impedance of 50 ohms. When you sweep to resonance, more voltage is dropped across the tank circuit vs the impedance of the generator. That is why he is seeing his signal increase, even though the scope is connected straight to the output of the generator.
Great demo Rick ! I am just curious, what frequency range did you use to excite your tank circuit with the generator? How did you go about choosing that frequency range?
rick when doing a radio receiver alignment procedure do you basically have to change coil or capacitor settings in the tank circuit to achieve the highest frequency output on the oscilloscope? also do some tank circuits have more than one coil? thanks for very helpful videos. john
Hi, great video! I have built a similar tank circuit with a 310 uH coil and a 400 pF variable capacitor. When varying the the capacitor over it's range, the resonate frequency should be from 0,45 MHz to 2.86 MHz.(according to the LC resonance formula). I took it a bit further and built a simple AM radio with a couple of transistors. Why is it that I don' t get the wide tuning area that the formula suggests? All the broadcast staions seem to be packed together. Tuning has litte affect.
Hi. Unfortunately, I have no video, but I have sent you the link to the circuit on email, as I was not able to post the URL here, for some reason. I am using it as a tank circuit.
Thank you. As a noob, I wonder if the vertical dashed lines to the left of the coil indicate an (inactive) former (e.g., a cardboard tube to support the coil), or an active part of the coil/tank? In other words, would we see the same results with a coil suspended in space with varnish along with the capacitor(s)? Are the vertical lines part of the circuit?
Very nice video! One thing that I didn't understand: Why give the capacitances and not the inductor's inductance too. Some formulas and values of inductance and resonant frequency would be nice.
Why arent you using a resistor in series with the signal generator's output lead? I don't understand how your oscilloscope is not reading the signal generator's output without a series resistance. When I do this I have to use resistor otherwise I'm just scoping the output if the signal generator
Maybe it's too late, and you might have already graduated but here is your answer anyway: Here, the internal resistance of the generator is considered as a kind of resistor so, he hasn't used any.
Thanks, But why in the case of LC tank "without power source" you called it resonant frequency? .. I know it is only called natural frequency, but if you give it a power signal with this same natural frequency, it will now be called resonance, right?
@@AllAmericanFiveRadio so it means "the frequency at which the circuit WILL resonate IF we apply the power with this same frequency" right?.. Yea we calculate it using the values L and C because it is the same natural frequency.. but in the normal scenario "with initial conditions only", the circuit will not resonate necessarily...
HI, I'd like to know how one arth can i measure the frequency i get off an LC Tank. I have done the formula V = 1 / (2 * pi * sqrt ( L * C ) and got a frequency but when i checked it out on my multimeter or oscillascope DSO 062 it comes up with something else.
AllAmericanFiveRadio idk about that. Can you do the same thing just to check if i am on the right path please? I used this formula to find the inductance www.daycounter.com/Calculators/Air-Core-Inductor-Calculator.phtml ( i am using d= 2 mm, n= 6 cm and l= 6.5 turns) please change it into inches. i used the formula to find the frequency V = 1 / (2 * pi * sqrt ( L * C ) --------- which C = 1nF from my calculations i got 94.77 MHz. on the oscilloscope DSO 062 it shows up with different freqs from 54k - 95k. It's only suppose to show up one freq on the oscilloscope right?
Charles Tan Building oscillator circuits is an acquired skill, meaning that something that does not seem important to you has a large effect on the circuit. The way you build the circuit of an oscillator or tank circuit is extremely important. When I build and oscillator and or a tank circuit I always keep the components as close together as possible and the leads connecting the components together as short as possible. At higher frequencies it is important to make sure everything is insulated otherwise the RF will find other pass that will change the performance of the circuit.
the same way that don smith deal with his device in order to fixing the resonant frequency of both primariy and secondary coil he increase the lenght of the secondary coil 4times and also decrease the capacitance of secondary to1/4.to resonate at same frequency35khz.
This is without a doubt the best and simplest explanation of measuring a coil.
Thanks Ron.
An excellent, clear demonstration of the effects of capacitor value change on resonance frequency. Thank you for the video!
I was singing along with my oscilloscope as I was watching your video! :)
I have learnt a lot from the you-tube videos on electronics. I hope to learn more from the tutorials. I am grateful and will share the skills and knowledge with students and other teachers
Your job is very appreciated!
Thank You!
Another great video, I definitely understand the tank circuit and its uses much better now, thank you as always!
Thanks for posting this...So clear and concise !
Love your presentations.
Rick,
Nicely done. Crystal clear.
Thanks.
Regards,
John
This is very well explained, thank-you!
Thanks and your welcome.
wow mind blown.. we building a LC induction heater this helps many thanks
THANK YOU!
Thanks CameramanLink
Your welcome. It fits nicely with the preceding video. This basic electronics, is in everything electronics in the passed, present, and the future. And that is because we did not make the rules, we can only use them.
Thanks so much Teacher, very helpful
Thank you, a great help!
Sir, I've been following you since the beginning of 2020 and have been cherry picking videos of interest to me from time to time. Now that I've retired, I am going through each one of them because I thoroughly enjoy them. I've been meaning to write this for a long time now and don't know if you'll ever read this but your illustration of electronics technology and principles is extraordinary. If the inventors and discoverers, of past and present, of electrical/electronic theory/tech., ever needed an illustrator for their work, you would be their choice. Thank you and God bless you for sharing your knowledge with the world.
Thank you very much. When I started this CZcams site I wondered if anyone would be interested. I taught and developed software courses for a large company, for over ten years. If I had not taken that job I may not even have a CZcams site. Or write two books. I appreciate you taking the time to send me a comment. I do have a free ebook, it's in the ABOUT. Here is the download link. The password is 'allamericanfiveradio' .
drive.google.com/file/d/1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp/view?usp=sharing
@@AllAmericanFiveRadio Yes, I'm up to "Tone Control" in chapter 4. Again, thank you. Joe
Thanks hedwig85
The frequencies are from about 100,000 to 250,000 Hz, and that is to keep the oscilloscope from strobing on the video. The capacitors are all 0.0022uf. That value of capacitor shows the change that I wanted to show on the oscilloscope without changing the scales on the generator. That makes the video run smoother.
The I.F. tanks coil and capacitor are chosen for a very high Q. Usually the adjustment is made with a variable capacitor or variable coil. It would be best to vary both for peek, but that would cost more for a little bit better performance. And what you are looking for on the oscope is the highest output at the intermediate frequency. Yes tanks can have more than one coil, the coil can be tapped too.
Even after all these years this video is a clear explanation to us lay folk 🙂 🍻 thank you for sharing
Thank you, and your welcome.
Some information is timeless.
very nice vid thanks! :)
@RadioDude1969
451.9kHz is the resonant frequency. The AM band is about 550kHz-1600kHz, I would try for a resonant frequency about in the middle, like 1MHz. See if that works better.
Nice video!
Thanks
A parallel resonant circuit will have maximum impedance at resonance. The function generator has an output impedance of 50 ohms. When you sweep to resonance, more voltage is dropped across the tank circuit vs the impedance of the generator. That is why he is seeing his signal increase, even though the scope is connected straight to the output of the generator.
Awesome Video sir 👍 I will try this today
Thank you, and your welcome. Keep experimenting!
Thanks MrSuperheterodyne
Thanks !
Thanks raddios2
well done
Great demo Rick ! I am just curious, what frequency range did you use to excite your tank circuit with the generator? How did you go about choosing that frequency range?
Thanks jimbobg65
I hope the videos help.
Thanks K4JOE
Verry usefull !!!!
rick when doing a radio receiver alignment procedure do you basically have to change coil or capacitor settings in the tank circuit to achieve the highest frequency output on the oscilloscope?
also do some tank circuits have more than one coil?
thanks for very helpful videos.
john
Thanks HomeProjectGuy
Hi, great video! I have built a similar tank circuit with a 310 uH coil and a 400 pF variable capacitor. When varying the the capacitor over it's range, the resonate frequency should be from 0,45 MHz to 2.86 MHz.(according to the LC resonance formula). I took it a bit further and built a simple AM radio with a couple of transistors. Why is it that I don' t get the wide tuning area that the formula suggests? All the broadcast staions seem to be packed together. Tuning has litte affect.
4:52 Great Synchronizing LC Oscillator Radio
@RadioDude1969
What is the range of the capacitor?
Out of curiosity, what would the trace look like if the cap were a dead short or open ?
Thanks 1fornone
@1fornone
Dead short, flat line. Open, what every the generator outputs.
Yes, but shouldn't I be able to tune the entire range between 451.9 kHz to 2.86 MHz with this variable capacitor and fixed coil?
@RadioDude1969
Are you using it as a tank circuit or an oscillator? Send me a video.
Hi. Unfortunately, I have no video, but I have sent you the link to the circuit on email, as I was not able to post the URL here, for some reason. I am using it as a tank circuit.
@RadioDude1969
You can send a URL's in a message but not in comments.
Thank you. As a noob, I wonder if the vertical dashed lines to the left of the coil indicate an (inactive) former (e.g., a cardboard tube to support the coil), or an active part of the coil/tank? In other words, would we see the same results with a coil suspended in space with varnish along with the capacitor(s)? Are the vertical lines part of the circuit?
Powered iron core
😇WOW SIR
Thank you, and your welcome.
@joernone
Thanks John,
Regards
Rick
also a DS 6062 oscilloscope..
i noticed that removing one capacitor does not reduce the frequency but reduces the amplitude
Great video . I always enjoy your Video's. Keep up the great work.
Joe K4JOE
Very nice video! One thing that I didn't understand:
Why give the capacitances and not the inductor's inductance too.
Some formulas and values of inductance and resonant frequency would be nice.
That's the easy part, just Google “LC Resonance Calculator”
Great now I can calculate my unknown inductor values. 🤠
Thanks and your welcome.
About 50 - 400 pF
Why arent you using a resistor in series with the signal generator's output lead? I don't understand how your oscilloscope is not reading the signal generator's output without a series resistance. When I do this I have to use resistor otherwise I'm just scoping the output if the signal generator
Maybe it's too late, and you might have already graduated but here is your answer anyway: Here, the internal resistance of the generator is considered as a kind of resistor so, he hasn't used any.
Thanks,
But why in the case of LC tank "without power source" you called it resonant frequency? ..
I know it is only called natural frequency, but if you give it a power signal with this same natural frequency, it will now be called resonance, right?
The resonant frequency is determined by the L and C of the circuit, with or without applying a power source or a signal source.
@@AllAmericanFiveRadio so it means "the frequency at which the circuit WILL resonate IF we apply the power with this same frequency" right?..
Yea we calculate it using the values L and C because it is the same natural frequency.. but in the normal scenario "with initial conditions only", the circuit will not resonate necessarily...
@@mibrahim4245 Yes, that is what the video shows.
My generator has a gain control.
HI, I'd like to know how one arth can i measure the frequency i get off an LC Tank. I have done the formula V = 1 / (2 * pi * sqrt ( L * C ) and got a frequency but when i checked it out on my multimeter or oscillascope DSO 062 it comes up with something else.
Charles Tan
I would believe the oscilloscope
AllAmericanFiveRadio idk about that. Can you do the same thing just to check if i am on the right path please?
I used this formula to find the inductance www.daycounter.com/Calculators/Air-Core-Inductor-Calculator.phtml ( i am using d= 2 mm, n= 6 cm and l= 6.5 turns) please change it into inches.
i used the formula to find the frequency V = 1 / (2 * pi * sqrt ( L * C ) --------- which C = 1nF
from my calculations i got 94.77 MHz. on the oscilloscope DSO 062 it shows up with different freqs from 54k - 95k. It's only suppose to show up one freq on the oscilloscope right?
Charles Tan I believe your calculation should be F = 1 / (2 * pi * Sqr (L * C) ) to determine the resonant frequency (F).
Charles Tan
Building oscillator circuits is an acquired skill, meaning that something that does not seem important to you has a large effect on the circuit. The way you build the circuit of an oscillator or tank circuit is extremely important. When I build and oscillator and or a tank circuit I always keep the components as close together as possible and the leads connecting the components together as short as possible. At higher frequencies it is important to make sure everything is insulated otherwise the RF will find other pass that will change the performance of the circuit.
Ok thanks for the info. I'll see what happens
Cheers
what about if we change coil reactance value and fixing capacitor value
If you replace this coil this a coil that has higher Henry's, the reactance will increase. It will also resonant at a lower frequency.
AllAmericanFiveRadio thank you
the same way that don smith deal with his device in order to fixing the resonant frequency of both primariy and secondary coil he increase the lenght of the secondary coil 4times and also decrease the capacitance of secondary to1/4.to resonate at same frequency35khz.
Thanks ntjbjhq
Thanks 1fornone