Great explanation. You have an aptitude to teach. One mistake though...you said you can apply a sinusoidal voltage to the tank circuit and adjust the amplitude when you should have said adjust the frequency, and resonance will be indicated by a peak in voltage of the sinusoid. Then the resonance frequency relationship for an LC tank is: fc = 1/[2*pi*sqrt (L*C)] plug in the numbers for C and fc and then solve for L.
lol i figured out the shaking camera through your comment - was only listening to the video and throwing a glimpse from time to time! :) Very good video! Keep up the good work
At about 11:45 you state that the voltage (of the capacitor) is constant. How can it be, as it us RAPIDLY discharging through the inductor under test (LUT) when fired by the SCR?. THANKS FOR THE GREAT VIDEOS!
Nice observation. I agree with you. But I think it's an assumption that it'll be fairly constant because the time dt is very short. before saturation occurs. And that capacitor is pretty big.
I never went to "School" on this subject. But I have to say after all i've self-researched on this, you really helped me understand quite a bit more! Very good video
Great video! I have some questions... What are places you recommend for buying ferrite cores from? At 17:05, you say you apply a sinusoidal signal and adjust the VOLTAGE until you get the highest peak value at your oscilloscope. Don't you mean adjust the FREQUENCY until you get the highest peak value at your oscilloscope?
i'm not sure if i'm doing it right bcs inductance seems to change with frequency in some cores(?) and my L-C meter reads fixed LC tank frequency... but for extracting the inductance-per-turn of a core (that is needed in some calculations) i wind 8 turns, check the inductance with my 10$ L-C meter and then divide the vaule i have by 64, because the inductance increases 4 times every double of the turns number, so instead of 2*2*2=8 turns, it's 4*4*4=64 value not sure... but it seems to work thanks for the saturation measuring method!!
can you do a video to explain how an average layman trying to self learn electronics can test an inductor for its strength. How much stronger my homemade inductor is compared to my 10 mH inductor I bought, for example. I would like to know what magnetic strength my inductor or solenoids have ... but, I do not know how to figure it out - or how to test it.
I heard somewhere that the laminated iron core is very lossy and pretty much useless above 400Hz. How is the performance, say at 10 or 20kHz? Is it usable or too lossy
There are laminated iron cores with different laminate thickness. The thinner the laminations, the higher the frequency you can use. But even the thinnest lamination cores are not great in the multi-kiloherz frequencies because they do have more losses than other cores you could use. I don´t know exactly how bad they generally are. But at least using your average core from a 50/60Hz Transformer for a switching power supply is not very efficient.
can yon give me a calculation of high frequency of Ferric core i have tl494 using IRF mosfet. my input voltage is 12v but i want it 12-0-12 input and the output is 35-0-35v want sizes and number of turns ? i have 5x6 cm ferric core transformer
Very nice. I hope to learn more about audio choke and transformer design. I like the idea of using iron in vacuum tube circuits but often appropriate devices are hard to find and expensive. One of the particular projects of interest is a choke tail pair phase inverter. It seems that it would be fairly straight forward. Adequate frequency range, inductance, and DC current. Typically looking at 15-25kHz with 10-40mA DC and enough inductance to load the tube cathodes. One question, does core material or geometry affect capacitance or is that strictly a matter of winding?
Lately I've become obsessed wanting to learn how to design my own EL Inverter circuits. It seems like it should require a minimum of parts: an inductor, a capacitor and a transistor to form the oscillator, and a step-up transformer. I'm not sure if suitable transformers are available on the market or if I'd have to design my own. Hantronix sells EL inverters (PCB + transformer) but it would be better to know how to make my own. I am working my way through your great, instructive videos. Thank you!
I just looked at it again, and saw that the two 'close' wires from the FWB may NOT actually be attached to each other...can't quite tell at the camera angle. Thanks for these GREAT videos!!!
Very electrically conductive? You really think so? 17% the conductivity of copper is good? I was under the impression that it was resistance that turned into heat because iron SUCKS as a conductor, as evidenced by welders and all of the metal melting videos. The copper wires just let the current breeze right through, but when it hits the nail or whatever between the 2 ends of the wires, it melts immediately. Iron is used due to being magnetic, and separated into laminations, and often used with shunts or air pockets to control the magnetic field generated by the windings when powered
You state that the capacitor in your 'tester' is 300uF. Isn't that actually a 3,300uF label? I plan to build it. That big wire is just always blocking the view! Thanks for the great video series!
Thanks for sharing this good video going into deeper explanations of inductances. At the end of your video you said you could figure the inductance of the inductor of your tank circuit by increasing the voltage of the sinusoidal signal to the highest point on your scope reading. Wouldn't it be that you could adjust the Frequency of your sinusoidal signal unit you reach the peak resonance? Or am I mistaken? Thank you.
3:33 ----------- How/what can you use that transformer(or inductor) for? I see that there are only 2 terminals instead up 4 or more? Do you just power it and that's it? What are some practical applications for that?
I knew you were off to a good start in this video because you were talking about real things, and did not have any added distractions such as music or other such noise. Also you are putting this at a basic level so most can understand what you are talking about. Even with a MS in electronics, one thing poorly covered was design of transformers, coils, motors etc. Just the basics of how they work and enough to do a simulation on a computer. The only thing that came close is calculating the inductance of an AIR core, and using a Smith chart.
Eric, I want to build your transformer saturation tester thingy. Can you post part numbers for your SCR, shunt resistor, and Capacitor. I have never seen a capacitor that big! I REALLY loved this video. Perhaps if you're interested, I will post pics of my transformer saturation tester......thingy. I have many transformers and inductors that I have taken from old t.v.s and such. This will turn out to be an invaluable tool for me when I build power supplies out of these spare parts. Anyways, thanks in advance, Eric. P.s. Post some more transformer vids if you will........Love them.
Hi! Thanks for the video. To make even better videos in future, please consider camera pod. Second you may clip and edit video after just a bit to get it more clear. That was quite astonishing you made it on 1 take! :)
Thanks for your video.İ wonder something. may i ask ? how can i calculate and wind 20 henry and 6 henry iductor.İt shold be as possible as small. with coal core.
Eric, thank you so much for your video.and i have a question,is your capacitor in the "saturation testing"circuit 300mF/600V?but on your paper it is 1000uF/100v.
beyond the 22 amp point where the L is saturated is it still storing field energy ? or is that point of max energy it has to transfer to the cap ? and does a cap have a limit to how much charge it can hold ? given the label on a cap of its voltage rating my guess is that , at the least, it has a charge/ voltage limit based more on materials/design than physics
In your measuring device: timestamp 9:46 I noticed a rather unusual bridge configuration, is this making the four diodes of the bridge into one diode for doubling the voltage AND current rating, thus converting it into a larger single rectifier? That should give a GREAT match on the four diodes.
Hi, I m building a dc-dc converter. 12v input, 380 volt output.. I am using e19/10/5 n27 grade ferrite core. The switching frequency is 100 khz. 50khz on one mosfet, i.e pushpull topology. Primary turns are 17 using25 swg and secondary are 550 36swg. But the output is on for sometime and then goes off. I m using sg3525 for pwm and p55ng06 mosfets. There is no air gap. Plz reply.
i guess Im asking randomly but does any of you know of a trick to log back into an Instagram account?? I stupidly lost my password. I would appreciate any assistance you can offer me!
@Avi Iker thanks so much for your reply. I found the site thru google and Im trying it out atm. Takes quite some time so I will reply here later when my account password hopefully is recovered.
Mr. Goodchild, can you share some insight into why/ how the laminates of some power trans are welded across laminates where the E and I laminates meet?
That makes perfect sense. I have this idea in my head that the laminates are insulated against each other to avoid eddy currents. Thanks for you time....
ຮຸ່ງ ພຸ່ງແຣງ I can not get 1 volt from 4 truns i get 1 volt from 3 turns ... I want to know calculation method before winding i shuld know how many turns required.
Please!!!!-- He is no where near The Great Nikola Tesla!!! I am not saying this young man does not have knowledge but to put him on the same level as Tesla is a BIG stretch!!
Note a parallel LC circuit should be fed from a current generator for it to resonate or else if fed from a low impedance voltage signal generator there should be a high resistance put in series to match the high impedance of the parallel LC circuit at resonance.
Great explanation. You have an aptitude to teach. One mistake though...you said you can apply a sinusoidal voltage to the tank circuit and adjust the amplitude when you should have said adjust the frequency, and resonance will be indicated by a peak in voltage of the sinusoid. Then the resonance frequency relationship for an LC tank is: fc = 1/[2*pi*sqrt (L*C)] plug in the numbers for C and fc and then solve for L.
While this video obviously lacks a steady camera, the actual content really is quite brilliant. Thanks a lot for the very good explanation!
lol i figured out the shaking camera through your comment - was only listening to the video and throwing a glimpse from time to time! :)
Very good video! Keep up the good work
I WAS GOING TO SAY THE SAME THING AS YOU GREGOR. I GET NAUSCIOUS FROM CAMERA MOTION. EVEN HAND HELDS IN HOLLYWOOD MOVIES MAKE ME SICKENED AS WELL.
soooo glad that somebody cares education.. thank you soo much
correct
Look out Dave Jones, Jeri Ellsworth, and Afrotechmods! We have a new kid on the tutorial block!
At about 11:45 you state that the voltage (of the capacitor) is constant. How can it be, as it us RAPIDLY discharging through the inductor under test (LUT) when fired by the SCR?.
THANKS FOR THE GREAT VIDEOS!
Nice observation. I agree with you. But I think it's an assumption that it'll be fairly constant because the time dt is very short. before saturation occurs. And that capacitor is pretty big.
That's not iron, that's silicon steel.
Steel is made from iron
Iron oxide and a binder. It's considered a ceramic I believe.
@@rich1051414 you're lost.
I never went to "School" on this subject. But I have to say after all i've self-researched on this, you really helped me understand quite a bit more! Very good video
Hi
Just saw your video. Great job
I am a retired math teacher and trying to learn the stuff
Are you still around?
Did you get an LCR meter?
Great video! I have some questions...
What are places you recommend for buying ferrite cores from?
At 17:05, you say you apply a sinusoidal signal and adjust the VOLTAGE until you get the highest peak value at your oscilloscope. Don't you mean adjust the FREQUENCY until you get the highest peak value at your oscilloscope?
i'm not sure if i'm doing it right bcs inductance seems to change with frequency in some cores(?) and my L-C meter reads fixed LC tank frequency... but for extracting the inductance-per-turn of a core (that is needed in some calculations) i wind 8 turns, check the inductance with my 10$ L-C meter and then divide the vaule i have by 64, because the inductance increases 4 times every double of the turns number, so instead of 2*2*2=8 turns, it's 4*4*4=64 value
not sure... but it seems to work
thanks for the saturation measuring method!!
Shaky video, would be good if you mount the cam somewhere
can you do a video to explain how an average layman trying to self learn electronics can test an inductor for its strength. How much stronger my homemade inductor is compared to my 10 mH inductor I bought, for example. I would like to know what magnetic strength my inductor or solenoids have ... but, I do not know how to figure it out - or how to test it.
Eric, this is very helpful. Thank you.
I heard somewhere that the laminated iron core is very lossy and pretty much useless above 400Hz. How is the performance, say at 10 or 20kHz? Is it usable or too lossy
There are laminated iron cores with different laminate thickness. The thinner the laminations, the higher the frequency you can use. But even the thinnest lamination cores are not great in the multi-kiloherz frequencies because they do have more losses than other cores you could use.
I don´t know exactly how bad they generally are. But at least using your average core from a 50/60Hz Transformer for a switching power supply is not very efficient.
So for a given core is saturation then amps*turns..? So 22.4 amps times however many turns you had on the test inductor?
I dont fuck around with high voltage. Looks cool though.
can yon give me a calculation of high frequency of Ferric core i have tl494 using IRF mosfet. my input voltage is 12v but i want it 12-0-12 input and the output is 35-0-35v
want sizes and number of turns ?
i have 5x6 cm ferric core transformer
Could you please show us how to open ferrite core. When I disassemble it it's broken .thanks for the video
I'm envious that you did that whole thing in one take. If I was making this video, I'd spend 2 hours on 20 clips with multiple takes for each clip.
Now Thank you for the video and explanations!
Iron core laminated cannot go beyond 50hz or 50khz?
nice. There are quite cheap LC meters available now that seem to work quite well - maybe one of those would be useful.
Please make more of these! :D
perfect thanks
Thanks for these video tutorials.
Very nice. I hope to learn more about audio choke and transformer design. I like the idea of using iron in vacuum tube circuits but often appropriate devices are hard to find and expensive. One of the particular projects of interest is a choke tail pair phase inverter. It seems that it would be fairly straight forward. Adequate frequency range, inductance, and DC current. Typically looking at 15-25kHz with 10-40mA DC and enough inductance to load the tube cathodes.
One question, does core material or geometry affect capacitance or is that strictly a matter of winding?
INDUCTION SATURATION DETECTOR aka ISD. Fantastic!!!! This is going on my resume 🤓 ASAP. Thank you
Lately I've become obsessed wanting to learn how to design my own EL Inverter circuits. It seems like it should require a minimum of parts: an inductor, a capacitor and a transistor to form the oscillator, and a step-up transformer. I'm not sure if suitable transformers are available on the market or if I'd have to design my own. Hantronix sells EL inverters (PCB + transformer) but it would be better to know how to make my own. I am working my way through your great, instructive videos. Thank you!
I just looked at it again, and saw that the two 'close' wires from the FWB may NOT actually be attached to each other...can't quite tell at the camera angle.
Thanks for these GREAT videos!!!
Very electrically conductive? You really think so? 17% the conductivity of copper is good? I was under the impression that it was resistance that turned into heat because iron SUCKS as a conductor, as evidenced by welders and all of the metal melting videos. The copper wires just let the current breeze right through, but when it hits the nail or whatever between the 2 ends of the wires, it melts immediately. Iron is used due to being magnetic, and separated into laminations, and often used with shunts or air pockets to control the magnetic field generated by the windings when powered
You state that the capacitor in your 'tester' is 300uF. Isn't that actually a 3,300uF label? I plan to build it. That big wire is just always blocking the view!
Thanks for the great video series!
Thanks for sharing this good video going into deeper explanations of inductances. At the end of your video you said you could figure the inductance of the inductor of your tank circuit by increasing the voltage of the sinusoidal signal to the highest point on your scope reading. Wouldn't it be that you could adjust the Frequency of your sinusoidal signal unit you reach the peak resonance? Or am I mistaken? Thank you.
3:33 ----------- How/what can you use that transformer(or inductor) for?
I see that there are only 2 terminals instead up 4 or more?
Do you just power it and that's it?
What are some practical applications for that?
I knew you were off to a good start in this video because you were talking about real things, and did not have any added distractions such as music or other such noise. Also you are putting this at a basic level so most can understand what you are talking about. Even with a MS in electronics, one thing poorly covered was design of transformers, coils, motors etc. Just the basics of how they work and enough to do a simulation on a computer. The only thing that came close is calculating the inductance of an AIR core, and using a Smith chart.
So focused on what's important. Excellent video.
Eric, I want to build your transformer saturation tester thingy. Can you post part numbers for your SCR, shunt resistor, and Capacitor. I have never seen a capacitor that big! I REALLY loved this video. Perhaps if you're interested, I will post pics of my transformer saturation tester......thingy. I have many transformers and inductors that I have taken from old t.v.s and such. This will turn out to be an invaluable tool for me when I build power supplies out of these spare parts. Anyways, thanks in advance, Eric.
P.s. Post some more transformer vids if you will........Love them.
purchase all of your transformer component requirements, including all sizes and grades of electrical steel from ASCO
ascocomponents.co.uk
It's simple. Just go to INPLIX page and make it yourself.
Hi! Thanks for the video. To make even better videos in future, please consider camera pod. Second you may clip and edit video after just a bit to get it more clear.
That was quite astonishing you made it on 1 take! :)
Thanks for your video.İ wonder something. may i ask ? how can i calculate and wind 20 henry and 6 henry iductor.İt shold be as possible as small. with coal core.
Wish you would continue these...
inductors creates wonders, this is very informative. thank you.
Hi,great video
If one uses a bigger wire size on the secondary ( lets say #28 instead of #30 awg). Will the output voltage be the same?
why dont you make an lcr bridge
nice video. what kind of program software are you using?
Eric, thank you so much for your video.and i have a question,is your capacitor in the "saturation testing"circuit 300mF/600V?but on your paper it is 1000uF/100v.
Very well explained! Thanks
Why don't you just pulse the SCR for a simple square wave?
I just did fool!
Thank you so much for detailed explanation but breaking it down so it is easy to follow and understand. Looking forward to following this series
Make me a vid on how to measure inductance with an oscilloscope >:-o
Excellent video. Very informative.
beyond the 22 amp point where the L is saturated is it still storing field energy ?
or is that point of max energy it has to transfer to the cap ?
and does a cap have a limit to how much charge it can hold ?
given the label on a cap of its voltage rating my guess is that , at the least,
it has a charge/ voltage limit based more on materials/design than physics
can anyone give me a design for 500mh inductor? thanks in advance, great vid. btw.
Very useful. Thanks for sharing.
thanx
i didnt understand every thing u said
how can i make 9 DC Volts 1.5A transformer when Power plug give 220 to 235 AC volts
Transform it 230 down to 9 then rectify and smooth the 9 volt transformer output.
How do i transform 1ghz up to some thousand volts?
Bust open a microwave and get a pretty snazzy mot
Gut level understanding, I LOVE it. Eric lives it - no memorization here. He gets it.
In your measuring device: timestamp 9:46 I noticed a rather unusual bridge configuration, is this making the four diodes of the bridge into one diode for doubling the voltage AND current rating, thus converting it into a larger single rectifier? That should give a GREAT match on the four diodes.
it's to charge his cap. It provides the AC from a variac. The FBR does the rectification.
How do you set your oscilloscope to cath the one shot wave?
Explanations are clear and concise. A+
Just use InpliX instructions. you will make it. its so easy
.
very good thx :::)
I wish i could understand all🤭
Hi, I m building a dc-dc converter. 12v input, 380 volt output.. I am using e19/10/5 n27 grade ferrite core. The switching frequency is 100 khz. 50khz on one mosfet, i.e pushpull topology. Primary turns are 17 using25 swg and secondary are 550 36swg. But the output is on for sometime and then goes off. I m using sg3525 for pwm and p55ng06 mosfets. There is no air gap. Plz reply.
Dear Near This comment is old, but do you need still help?
If yes, send me your email address.
lol
Excellent Video - great to see some practical application.
good teaching. You make a good teacher.
hey where to bay that model scr what it is call that model of scr
this is golden!
Thanks!
Great Video Thanks for your time....
thank u Eric 4 the nice video
What a great explanation, regards
Where can i but those e plates online??????
purchase all of your transformer component requirements, including all sizes and grades of electrical steel from ASCO
ascocomponents.co.uk
good video here :3
Thanks!
excellent
i guess Im asking randomly but does any of you know of a trick to log back into an Instagram account??
I stupidly lost my password. I would appreciate any assistance you can offer me!
@Stephen Brian instablaster ;)
@Avi Iker thanks so much for your reply. I found the site thru google and Im trying it out atm.
Takes quite some time so I will reply here later when my account password hopefully is recovered.
@Avi Iker it did the trick and I finally got access to my account again. I am so happy:D
Thanks so much you really help me out :D
@Stephen Brian Glad I could help :D
Mr. Goodchild, can you share some insight into why/ how the laminates of some power trans are welded across laminates where the E and I laminates meet?
Ehm, to physically connect the E and I core very strongly.
That makes perfect sense. I have this idea in my head that the laminates are insulated against each other to avoid eddy currents. Thanks for you time....
Chuffing Ale I think that is the purpose oft laminated cores but since i just started learning electronics a few Werks ago i dont really know :)
@@jan-christianerichsen6532 Don't you think it's something to do with killing the airgap? hence increasing inductance?
Hi
Do you know how to calculate transformer voltage per trun
kamran ali if you can not get 4 turns per one volt then you need more cross section area.
ຮຸ່ງ ພຸ່ງແຣງ
I can not get 1 volt from 4 truns i get 1 volt from 3 turns ...
I want to know calculation method before winding i shuld know how many turns required.
This man = 2nd coming of Nikola Tesla
Please!!!!-- He is no where near The Great Nikola Tesla!!! I am not saying this young man does not have knowledge but to put him on the same level as Tesla is a BIG stretch!!
Look up Eric Dollard if you want to hear some one close to The Great Mr Tesla
Outstanding video
I have spent months studying circuits and found a fantastic resource at Gregs Electro Blog (check it out on google)
Gregs Electro Blog has downloadable books that you have to pay for.
Note a parallel LC circuit should be fed from a current generator for it to resonate or else if fed from a low impedance voltage signal generator there should be a high resistance put in series to match the high impedance of the parallel LC circuit at resonance.