What a great video about these transformers! Just wanted to rewind the secondary from one of them, so I was searching YT. Your video is what I was looking for. You've learned me how to disassembly it. Very clever. Thank you a lot. Congratulations!
1) If you use your circuit to light a light bulb, the waveform is not important, but surely you know that you are not putting a pure sine wave into that bulb. For powering electronic equipment the matter is quite different. 2) You use a frequency of 35 kHz. How do you know that your transformer has the best efficiency at that frequency? Maybe it has its best efficiency working at another frequency. Have you checked it? 3) Most of the transformers you recover from broken computer power supplies can be used without even touching them. Almost all are rated for 120 Volts on a primary winding with 12 Volts on the secondary. 4) You work very neatly. I liked your video
I make this type supply but my mosfet 3207is very heat on load and without load please help me ineed 30v+- dual supply 5amp for amplifier ,which core is better and how many turn in primary and secondary
Hi, I have a doubt, for primary 1st half you wound in clockwise but the second half you did in a counter-clockwise wise is there any significance for this direction? pls, explain.
Dầu vecni cách điện, bạn mua tiệm đồ điện nhé, nó dùng ngâm biến áp hoặc ngâm motor. Loại này loãng, dễ thấm sâu, lâu khô hơn loại trong (khoảng 1 đêm mới khô)
why 380V diveded 4? The two primary coils are wrapped in opposite directions, doest the two coils powered alternately by the two mosfet? is the output 220V Ac?
Friend, I need your help to calculate a transformer that I believe is the ETD49 due to the specifications that I find in the datashett, since he did not bring numbering, I took it out of a burned old inverter, which I apply the formula that appears here in the video, being the It works at 50 kilohertz and it comes out in the primary one turn only and in the secondary it comes out 63 turns the diameter of the inside is 1.67 since the there is round and not square another observation that he is ee49 vertical thanks I hope you help me
Nicely done , great . I have rewind the transformer , I always have an issue with tinning the enamel wire , can you share how to , I see you have made a litz wire on the secondary , what is the total wire dimension and number of strands on it , as well as turns
I have tried everything to solder litz wire and ultimately always have to strip every single wire individually and solder them. So I am curious what flux you are using, because mine does not work this way even at the temperature you show. Can you provide a link to and AliExpress listing?
What is the 380V in your secondary voltage? It is already 270Vrms if yours is Vpeak. Where do you leave you have so high voltage? Most country use 230Vrms or 325Vpeak.
Such a great video but i have a question why did you wind the first loop of primary from right to left and the second half in revers from left to right ?
you need to know the material of the core. so for that you need to look at the manufacturers spec sheet. some materials are not made for SMPS transformers, however this core was already used as a transformer so it will be the right material. Most commercial transformers have a saturation flux density at 100C of about 3KG. so using 2000 Gauss (2KG) is conservative, and if there is a current unbalance in the transformer then still the core will not saturate. So that is why 2KG is used. Also the higher the Flux change the higher the core loss due to hysteresis in the material.
its awesome project sir i have ee55 ferrite core can you tell me one side e core calculation or both side e core calculaton and tell me 1000w use wire guage and number of turns with stable frequency
I have followed your videos and and tried to make an inverter but when I connect the power supply. i short circuit appears . I already checked the transistors and I have made 2 transformers but it doesn't work. any recommendation or you will know what I'm doing wrong
Hello This calculation is true for the secondary page wire when dead time = 0. And if the duty cycle is 0.96, then for 12 volts 12 × 0.96 = 11.76 Therefore (N / 3) = (380 / 11.76) N = 129 turns Do you think this is the case or not?
Olá amigo quero dizer gosto muito dos seus videos. quero saber quantos fios e qual a espessura do enrolamento primário e como calculou a potência de 500w
thank for your tutorial video, but when i turned via your formulas, the voltage's secondary coil is more than 1kV, i don't know why, i choosed f=36kHz, Bmax=2000Gauss, S =1.363cm2, 12V to 220V => N (Primary coil) =3 turns, N (Secondary coil) =57 turns. Can you answer that where is my error
Thanks for this video , it is very useful. Just a question, how do you calculate the secondary number of turn ? How you calculate the number 4 used to divide 380V to obtain 95 turns ? BR
@@PhdHung Instead of selecting the number of revolutions for 1 volt, select for 12 volts. This method is the same for you or me. That's the Proportionality ratio . Ask a math teacher to find out.
Sir i see ur video, i make etd 42 2+2 trun for 12v sir every thing is ok irf3205 is ok but etd 42 is not work when i power on irf3205 is going heat sir plz help what i do.
Great work.💥💥💥. I try building mine with irf540 MOSFET. It worked but the voltage was not up to 230 nd the mosfet was getting very hot. Pls hw can I prevent the mosfet from getting hot. Thanks 🙏🙏🙏
I have few very same looking ones (like chopped from left and right side like yours) and they blew up. Opened one of them and cristal mouned on Drain body was like 1mm².
muy agradecido por su video...tengo una duda el calculo no deberia hacerse sobre 24 voltios....pf como saco la potencia de 500 wts del toroidal...muchas gracias
Thank you for this wondrous tutorial. Can I ask if only the primary is wound clock and counterclockwise? How about the winding in the secundary, the same or not? Thank in advance.
Thanks. Yes, you can use EE40. I think it needs 2 + 2 turns for the primary. If you use single strings. It cannot work at too high frequency because of skin effect.
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Homemade 102 lỏi biến áp tròn đo tính cung giống vậy lun hak bạn
What a great video about these transformers! Just wanted to rewind the secondary from one of them, so I was searching YT. Your video is what I was looking for. You've learned me how to disassembly it. Very clever. Thank you a lot. Congratulations!
Yes, I'm glad it was helpful to you.
@@PhdHung ...today rewinding completed, transformer assembled and installed back in its place. Power supply works great. One more thank you!
You're a tribute to humanity, happy new year.
ETD44 : primary 8x0.9mm litz 4turn + 4turn, 3V/turn, 3Vx4turn=12V. f-26khz, Bmax-2000, S-173mm"=1,73cm", Vin-12V. Secondary 90turn 0,65mm. 3Vx90turn=270V, 270Vx1,41=380V + H bridge pure sine ~230V. 5A/mm"? r"=0,325x0, 325x3,14=0,331mm". 0,331x5A=1,65A. 230Vx 1,65A=max 380W maximum....
1) If you use your circuit to light a light bulb, the waveform is not important, but surely you know that you are not putting a pure sine wave into that bulb. For powering electronic equipment the matter is quite different.
2) You use a frequency of 35 kHz. How do you know that your transformer has the best efficiency at that frequency? Maybe it has its best efficiency working at another frequency. Have you checked it?
3) Most of the transformers you recover from broken computer power supplies can be used without even touching them. Almost all are rated for 120 Volts on a primary winding with 12 Volts on the secondary.
4) You work very neatly. I liked your video
you are the best teacher making proyects..best regards from venezuela
Please...what is the different between many wires and one wire to rewind a transformer? more power or more heat or more interference?
Can you do a video on the ee5525b core current density
Thank you. I learned a lot. I have a question. In "Secondary 380 Volt / 4 = 95 turns", where does the division 4 come from?
Thanks!
Your videos are awesome and I like it the most.👌👌👌👌👌
Nice ... first time you did for which i search ...
Thanks for watching
Thanks for your video. i want to understand more about how can demonstrate the formula in your video
can this formula be used to convert 220v to 12v? What is the 4 in the formula 380/4? Thank you.
I make this type supply but my mosfet 3207is very heat on load and without load please help me ineed 30v+- dual supply 5amp for amplifier ,which core is better and how many turn in primary and secondary
Hi, I have a doubt, for primary 1st half you wound in clockwise but the second half you did in a counter-clockwise wise is there any significance for this direction? pls, explain.
This circuit uses push-pull. So 2 coils will be opposite.
Hi, i noticed for the primary the two windings go opposite ways, is that right ?
hello. How many strands of litz wire did u use? and i believe the litz wire are gotten from old transformer primary?. thanks
I do not count. maybe around ~ 100.
Thank you and very good video. Can I ask for the formula to calculate number of turns in the secondary, please? Thank you again!
Hi
excellent information, thank you very much for sharing it 🤝👍
I need to calculate flyback transformer 🤔
Yes, I will do it. Calculation of transformer gap is very difficult.
Cái dung dịch insulating vanish mua ở đâu hả bác?
Dầu vecni cách điện, bạn mua tiệm đồ điện nhé, nó dùng ngâm biến áp hoặc ngâm motor. Loại này loãng, dễ thấm sâu, lâu khô hơn loại trong (khoảng 1 đêm mới khô)
What book do you recommend or article for ferrite core transformers.
Very helpful video. I liked it
Thanks for watching
why 380V diveded 4? The two primary coils are wrapped in opposite directions, doest the two coils powered alternately by the two mosfet? is the output 220V Ac?
Friend, I need your help to calculate a transformer that I believe is the ETD49 due to the specifications that I find in the datashett, since he did not bring numbering, I took it out of a burned old inverter, which I apply the formula that appears here in the video, being the It works at 50 kilohertz and it comes out in the primary one turn only and in the secondary it comes out 63 turns the diameter of the inside is 1.67 since the there is round and not square another observation that he is ee49 vertical thanks I hope you help me
If you use it for 12V. Primary 2 turns + 2 turns. secondary 60 turn (350V)
@@PhdHung so friend to work at that frequency of 50,000 or it doesn't matter if at 35,000 thanks

Nicely done , great . I have rewind the transformer , I always have an issue with tinning the enamel wire , can you share how to , I see you have made a litz wire on the secondary , what is the total wire dimension and number of strands on it , as well as turns
I use high temperature + rosin. The insulation will be burnt. 15:30 450*C
Thanks for your calculation.
I have tried everything to solder litz wire and ultimately always have to strip every single wire individually and solder them. So I am curious what flux you are using, because mine does not work this way even at the temperature you show. Can you provide a link to and AliExpress listing?
The problem is copper wire, please use yellow copper wire.
How to know how much max watts can get in atx core or other ferrite core. unknown one found on pcb
On average, 1cm2 max about 400W.
What is the 380V in your secondary voltage? It is already 270Vrms if yours is Vpeak. Where do you leave you have so high voltage? Most country use 230Vrms or 325Vpeak.
Such a great video but i have a question why did you wind the first loop of primary from right to left and the second half in revers from left to right ?
I use push pull circuit. It needs 2 coils in the opposite direction.
Great job sir pls make half and full wave pulse transformer winding video. Thanks again
ok, :D
Whats the point of 35khz ? Why not 60/50 hz ?
This is the pulse transformer. It works at ultrasonic frequency
What would be the output voltage then ?
If there is one wire on the secondary how can it b ac .if so wouldn't it be like a short circuit
Best video abuot this complicate transformers i get the idea.
Thank you
Sir hw did u control the current flowing into the transformer to be 21amps.
Thank you so much for teaching.
Ótima aula meu amigo. Estou muito agradecido. Vai me ajudar muito.
Thank you
Where are you from? Your videos are inspiration to many.
thank you
Is it become a 12-0-12 transformer now?
Very good my friend. Keep going
Thanks
I was waiting for this video
Thanks bro
I'm waiting for your video finally done.
Yes, soon
@@PhdHung sir ic 555 or cd4047 can i 33khz generate frequency? For drive atx transformer Please reply sir
NE555 and 4047 have no deadtime, working at high frequencies is difficult
@@PhdHung sir how to simple generate 33khz frequency i have no pc please provide me a simple circuit diagram.
Any ic like sg3525 or tl494 i need without pcb make it.
Did u used a snubber in this
Hello, i have an atx psu transformer. My question is will I get the primary input 220V? My transformer power is 750W
I need the core size.
I didn't disassamble how can i measure it?
GREAT VIDEO!!
Didn't you wind the two (3-turn) windings of the thick wire in opposite directions?????
THANKS. This will help much!!!
Lõi ferrit cái biến áp của e bị vỡ thành nhiều mãnh giờ e dùng keo 502 dán lại thì có dc ko anh
Brother , How you got Saturation magnetic flux density? Can you explain.
My English is very bad, very difficult to explain. Please search on google. Google is the best teacher.
you need to know the material of the core. so for that you need to look at the manufacturers spec sheet. some materials are not made for SMPS transformers, however this core was already used as a transformer so it will be the right material. Most commercial transformers have a saturation flux density at 100C of about 3KG. so using 2000 Gauss (2KG) is conservative, and if there is a current unbalance in the transformer then still the core will not saturate. So that is why 2KG is used. Also the higher the Flux change the higher the core loss due to hysteresis in the material.
@@johnconrad5487 thanks for your explanation ✌️
its awesome project sir i have ee55 ferrite core can you tell me one side e core calculation or both side e core calculaton and tell me 1000w use wire guage and number of turns with stable frequency
Hi my friend, your work is great. Explain more about awg wires if you can. Thank you🙏
Just google awg and you find all measurements.
I have followed your videos and and tried to make an inverter but when I connect the power supply. i short circuit appears . I already checked the transistors and I have made 2 transformers but it doesn't work. any recommendation or you will know what I'm doing wrong
Hi, brother let me know if possible to parallel the transformer 500watts with same size to make 1000watts.
You can pair the two cores together. Or use two separate transformers. Secondary serial connection.
Hello
This calculation is true for the secondary page wire when dead time = 0. And if the duty cycle is 0.96, then for 12 volts
12 × 0.96 = 11.76
Therefore
(N / 3) = (380 / 11.76)
N = 129 turns
Do you think this is the case or not?
excellent...#request video# ....5 stage 12v lead acid battery charger...??
yess, ok
Olá amigo quero dizer gosto muito dos seus videos. quero saber quantos fios e qual a espessura do enrolamento primário e como calculou a potência de 500w
I don't know how much the B（MAX) so how to deal with the problem?Thanks
thank for your tutorial video, but when i turned via your formulas, the voltage's secondary coil is more than 1kV, i don't know why, i choosed f=36kHz, Bmax=2000Gauss, S =1.363cm2, 12V to 220V => N (Primary coil) =3 turns, N (Secondary coil) =57 turns. Can you answer that where is my error
8:23 but if we use for example H bridge the calculation is be 41/4 ???
No, if you use the H-bridge divide by 1
@@PhdHung OMG thank you very much for help
Thanks for this video , it is very useful. Just a question, how do you calculate the secondary number of turn ?
How you calculate the number 4 used to divide 380V to obtain 95 turns ? BR
12 v = 3 turn
380 v = ?
380×3= 1140
1140÷ 12 =95 turn
@Home Electronic 1 No!!!!
12V = 3 turn.
1 volt need 3:12 = 0.25 turn
380Volt x 0.25 = 95 turns
@@PhdHung This is the same as trying this method or this method.
380v ÷ 12v = 31.66 >>>> 31.66 X 3 = 95 Turn
@@PhdHung Instead of selecting the number of revolutions for 1 volt, select for 12 volts. This method is the same for you or me. That's the Proportionality ratio . Ask a math teacher to find out.
well done for the video you uploaded. this 380v transformer makes for inverter pure sine wave to 220v ????
Can be used for sine inverters. However, here I use it for an electric fishing.
Boiling for 3 minutes, the best thing I learned. They were always difficult to get apart without breaking a ferrite core. The rest I knew.
Dây nhiều sợ ngon hơn hả , cảm ứng từ B trung bình 2000 ? .
tất nhiên rồi. Bmax là 1 Tesla = 10000. Mình chọn 2-3000 cho an toàn.
Sir i see ur video, i make etd 42 2+2 trun for 12v sir every thing is ok irf3205 is ok but etd 42 is not work when i power on irf3205 is going heat sir plz help what i do.
sir, how do i achieve this low "no load current" your is awesome. can you show me how
How much watt a chopper can provide,how can I know this?
It depends on the cross section of the core. About 300W for 1cm2
My friend, when the transformer was wound when I turned on the inverter, it closed it short in the battery, why
Without removing copper thin insulation how soldering is done ?
15:30 I use 450*C . The insulation will burn.
Thanks friend for answer, sorry where you get that information or rather what book is guided.
Great work.💥💥💥.
I try building mine with irf540 MOSFET. It worked but the voltage was not up to 230 nd the mosfet was getting very hot.
Pls hw can I prevent the mosfet from getting hot.
Thanks 🙏🙏🙏
Hi, in the beginning when you're testing circuit, are those 2 MOSFETs, fake 3205 , or original?
I think it's not fake, because I took it in an old inverter.
I have few very same looking ones (like chopped from left and right side like yours) and they blew up. Opened one of them and cristal mouned on Drain body was like 1mm².
:)) 2 MOSFET is very cool when working. Although I do not use heatsink.
@@PhdHung Thanks for reply and nice videos :)
muy agradecido por su video...tengo una duda el calculo no deberia hacerse sobre 24 voltios....pf como saco la potencia de 500 wts del toroidal...muchas gracias
with this calculation I will be able to then calculate a 2 x12 to 220 volt transformer for construction to pure sine wave Inverter ????
of course
Good afternoon, just put the calculations for the primary, how do we calculate the secondary data?
How you know that trafo have a 500W? is there formula to calculate unknown trafo?
On average, 1 cm2 has a maximum of 400W.
Thank you! 🙌 I took notes!
Hello, what will happen if the core has an air gap?
gracias por el aporte, seguí así, saludos desde Arg.
que diámetro de alambre usa en el secundario para 220volt ; y trenzado por dos? , gracias
It's awesome dear can you tell me this project driver circuit
There are many on my channel.
Hello sir..what is the size of primary and how many strands..tnx
..pls reply sir...thanks..
How much Input current required?
500W / 12V ~ 40A
Sir, how much SWG will he need?
Why primary 3+3 turn not 4+4 turn ,when calculated per turn voltage 3.2 V
Other calculation base seconddary output voltage 380 volt why not 220 Volt
I need 380V voltage for the sine inverter.
Can I calculated base on 220 volt
thanks a lot i was searshing for such calculations .
can we applay the same calculation for diffrent firrite core size ????
Yes, all core sizes. But this calculation formula is for push-pull. Cannot be used for H-Bridge or flyback.
@@PhdHung all right i got it thanks for fast answering
thank you very much. I would to design a transf for high voltage 300 V to 3kV. can you please help me?
You want to use flyback. Push-pull or H-bridge ?
Homemade 102 Push pull.
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shopee ấy, tìm thước kẹp điện tử là có. hình như mua có 8 chục
@@PhdHung dạ cảm ơn a
Thank you for this wondrous tutorial. Can I ask if only the primary is wound clock and counterclockwise? How about the winding in the secundary, the same or not? Thank in advance.
bro how to calculation formula iron core plzzzz tell me 12vdc to 220vac
Ok, wait me.
@@PhdHung bro thx
And for 24v ?
use 6 + 6 turn and 2mm2
Plz tell me . I made a inverter 200watt 4 MOSFET ।।
I don't use any IC
But my inverter no load 4A use
But why ?
Dung dịch ngâm vài biến áp là gì vậy mong dược trả lời
vecni tẩm biến áp và động cơ, bán rất nhiều.
can u make a video of calculating the max wattage of a ferrite pulse transformer (maybe the one in this video as example). Thanks
What is the name Mosfet that you used 😊🤔
IRF3205
What a good one there, please how do I remove the copper insulation
Use soldering iron at 400 *C. The insulation will burn.
@@PhdHung thanks bro
Can it work for inverters
of course
the feedback??
I use 12V to 380V. So there will definitely be feedback
Hi my friend, as always great! Excuse me, can I use the transe ee40? What about single string wire?
Thanks. Yes, you can use EE40. I think it needs 2 + 2 turns for the primary. If you use single strings. It cannot work at too high frequency because of skin effect.
@@PhdHung OK . Thank you, my brother👍
hi can you please do calcaulation of a flyback converter
ok, wait me
hóng video anh ra
:))
10:10 how many wire?
Thank you😍🌹💞