Very interesting, particularly your winding interleaving and foil/flux band application. I also like the bobbin at the rear, (farthest away from winder's face!) instead of de-reeling from back. I had to pay attention when your 'traverse' hand wasn't apparent...I was amazed at your 'automatic' layering. Nice job.
Thanks! I guess it's as unconventional as it gets, I just did it the way I feel comfortable, but the results are very good and pretty consistent despite the "semi scatter winding technique":)
Hi! I buy the wire locally here in Budapest, Hungary, but I'm sure you can find it locally anywhere in the world, just check the companies that sell parts for electric motors, they usually sell the double coated wire rated for 200 degrees C.
Howdy. Greetings from Finland. About getting laminations and bobbins. Search eBay for "line transformer" or "audio line transformer". One will have several matches: I used a match to the vendor "Parts Express". They have 100 W and 70 V items on stock. The price was abot 30 dollars a piece. I ordered two items. The laminations are audio grade steel. I got them yesterday (26.03.2021). I intend to rewind them for my DIY KT88 PP PA. I express my gratitude to Parts Express and eBay. Regards.
Good video, although would do with some explanations. I was making a push-pull transformer for my push-pull converter. The output is 120V as expected from a 20V primary. However, when I put a load, the output drops from the 120V to about 11V or 9V. Do you have an idea of what might be the cause
Thanks! Yeah, this one was done without much explanations. You can check my other transformer videos and I also have tutorials available for sale on my website: www.delatsch.com/shop/ There will be an option with the in-depth video tutorial as well very soon! I must admit I have no experience with push-pull converters, but if you calculated the transformer correctly you should have proper number of turns for 20V primary and then have the number of secondary turns accordingly. Did you wind the transformer yourself or you are using off the shelf transformer?
Hi Pronoy! Calculating and winding an output transformer requires a bit more than a simple formula, but I've made a really simple tutorial and a automated spreadsheet for calculating output transformers (both PP and SE) and it's available on my website for sale as a download: www.delatsch.com/shop/ If you would like to find a free option there are several books on the subject that you can download for free, like Wolpert's Audio Transformer Design book. It is more complicated and requires you to manually calculate several aspects of the design. The good thing about the spreadsheet I've developed is that it is extremely straightforward and simple and anyone can use it easily. The price is there more as a support for me, so I can more easily continue to develop similar automatic calculators and make better videos and new projects.
My Transformer bobin ariea as 3×5 cme . Primare impedance 500 ohom and secondary impedance 8 ohom . 6 volt audio . Plese call primare and secondary turn number
Thank you for your comment, Nang. The formulas are availabe for my patrons and supporters on Patreon. However, I have an automated excel sheet for calculating PP Output Transformers and a short PDF tutorial that goes along with it. It is for sale, so please contact me on my facebook page for more information if you are interested.
You can now purchase the excel calculation sheet and a short PDF tutorial at this link: czarek86.webd.pl/index.php/product/push-pull-output-transformer-excel-sheet-calculator-with-pdf-tutorial/
Hi! Thanks! Well, the problem is I don't know any place online that sells it in small quantities, so usually there are are minimum orders which are palettes and that's way to expensive. I found the laminations locally in Serbia but there is no way to order it online unfortunately.
Thanks for your interest in output transformer calculation! The calculation and the detailed tutorial for transformer building will be available for my patrons. I'm still working on the tutorial so if you are interested, please check my Patreon page and stay tuned there for more info. www.patreon.com/delatsch
I... don't understand... first you counted 1400 winds, then you've changed de wire gauge, and I've counted 100 and... something (its not that important), but... then you've wound another 1400 !!?? Thats another primary? I am a beginner in constructing transformers for tube amplifiers, but I want to learn! And so far, thanks to you, I've got a few things... but not this one! Thank you!
In a push-pull amplifier you have two plates or anodes. So, one half of the primary is 1400 for one tube and another 1400 for the other tube, and they are connected together to make a centre tap which goes to B+.
@@Delatsch Thank you! It makes sense, of course... but why you put in between another winding? What is that for? That's, actually, my question... why didn't you wound the 2 x 1400, one over another, and the smaller one over both of them? Why you put the smaller one in between? Thanks again!
Oh I see what you mean. The interleave or sandwich is used to reduce leakage inductance and extend the range of higher frequencies in a a transformer. For guitar amps it is not as critical but in hifi output transformers there are usually two-three and more interleaves of primary and secondary.@@jerichotm2122
Very interesting, particularly your winding interleaving and foil/flux band application. I also like the bobbin at the rear, (farthest away from winder's face!) instead of de-reeling from back. I had to pay attention when your 'traverse' hand wasn't apparent...I was amazed at your 'automatic' layering. Nice job.
Thanks! I guess it's as unconventional as it gets, I just did it the way I feel comfortable, but the results are very good and pretty consistent despite the "semi scatter winding technique":)
Very exciting - both the music and the video - like watching paint dry :-)
Very nicely done.
Thank you!
I'll buy your calc soon. :) Just saving money for a while. :)
Hello where do you buy the big copper role wire and what is the thickness and the length?
Thanks in advance Gino
Hi! I buy the wire locally here in Budapest, Hungary, but I'm sure you can find it locally anywhere in the world, just check the companies that sell parts for electric motors, they usually sell the double coated wire rated for 200 degrees C.
www.remingtonindustries.com/
Howdy. Greetings from Finland. About getting laminations and bobbins.
Search eBay for "line transformer" or "audio line transformer". One will have several matches:
I used a match to the vendor "Parts Express". They have 100 W and 70 V items on stock. The price was abot 30 dollars a piece. I ordered two items. The laminations are audio grade steel.
I got them yesterday (26.03.2021). I intend to rewind them for my DIY KT88 PP PA.
I express my gratitude to Parts Express and eBay.
Regards.
excelente...
Thanks!
thanks to you...
Good video, although would do with some explanations. I was making a push-pull transformer for my push-pull converter. The output is 120V as expected from a 20V primary. However, when I put a load, the output drops from the 120V to about 11V or 9V. Do you have an idea of what might be the cause
Thanks! Yeah, this one was done without much explanations. You can check my other transformer videos and I also have tutorials available for sale on my website:
www.delatsch.com/shop/
There will be an option with the in-depth video tutorial as well very soon!
I must admit I have no experience with push-pull converters, but if you calculated the transformer correctly you should have proper number of turns for 20V primary and then have the number of secondary turns accordingly. Did you wind the transformer yourself or you are using off the shelf transformer?
What are the winding details ?
Good video,, Can you tell me where you bought your Hand operated winder? :)
Thanks, you can find it on ebay, just type "NZ-1 coil winder" and it will pop up.
Thanks D,, I love those,, been looking for one for quite some time :)
is there any tutorial how to design manufacture build repair transformer
You can check specific tutorials and calculators I have for sale on my website:
www.delatsch.com/
Please call output Transformer winding formula
Hi Pronoy! Calculating and winding an output transformer requires a bit more than a simple formula, but I've made a really simple tutorial and a automated spreadsheet for calculating output transformers (both PP and SE) and it's available on my website for sale as a download:
www.delatsch.com/shop/
If you would like to find a free option there are several books on the subject that you can download for free, like Wolpert's Audio Transformer Design book. It is more complicated and requires you to manually calculate several aspects of the design. The good thing about the spreadsheet I've developed is that it is extremely straightforward and simple and anyone can use it easily. The price is there more as a support for me, so I can more easily continue to develop similar automatic calculators and make better videos and new projects.
My Transformer bobin ariea as 3×5 cme . Primare impedance 500 ohom and secondary impedance 8 ohom . 6 volt audio . Plese call primare and secondary turn number
Please give me the formula
Thank you for your comment, Nang. The formulas are availabe for my patrons and supporters on Patreon. However, I have an automated excel sheet for calculating PP Output Transformers and a short PDF tutorial that goes along with it. It is for sale, so please contact me on my facebook page for more information if you are interested.
You can now purchase the excel calculation sheet and a short PDF tutorial at this link:
czarek86.webd.pl/index.php/product/push-pull-output-transformer-excel-sheet-calculator-with-pdf-tutorial/
how to make winding machine pro
where can a person find parts for winding transformers?
Hi! Thanks! Well, the problem is I don't know any place online that sells it in small quantities, so usually there are are minimum orders which are palettes and that's way to expensive. I found the laminations locally in Serbia but there is no way to order it online unfortunately.
www.edcorusa.com/
What kind of you need
where is the calculation? link?
Thanks for your interest in output transformer calculation! The calculation and the detailed tutorial for transformer building will be available for my patrons. I'm still working on the tutorial so if you are interested, please check my Patreon page and stay tuned there for more info.
www.patreon.com/delatsch
Alberto Suarez this vediyo very good this not yendg terns howmach?
2800T:88T ? 4K : 4ohm?
Yeah, nominally it's around 4200:4.
EW CHEE GUAN
The copper wire must cost a fortune!
It is very pricey, but if you make a lot of transformers it's ok. In case you wanna wind only two or three transformers it doesn't really make sense.
I... don't understand... first you counted 1400 winds, then you've changed de wire gauge, and I've counted 100 and... something (its not that important), but... then you've wound another 1400 !!?? Thats another primary? I am a beginner in constructing transformers for tube amplifiers, but I want to learn! And so far, thanks to you, I've got a few things... but not this one! Thank you!
In a push-pull amplifier you have two plates or anodes. So, one half of the primary is 1400 for one tube and another 1400 for the other tube, and they are connected together to make a centre tap which goes to B+.
@@Delatsch Thank you! It makes sense, of course... but why you put in between another winding? What is that for? That's, actually, my question... why didn't you wound the 2 x 1400, one over another, and the smaller one over both of them? Why you put the smaller one in between?
Thanks again!
Oh I see what you mean. The interleave or sandwich is used to reduce leakage inductance and extend the range of higher frequencies in a a transformer. For guitar amps it is not as critical but in hifi output transformers there are usually two-three and more interleaves of primary and secondary.@@jerichotm2122