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Project Specific Discussions => Magnetics => Topic started by: iprovlek on April 11, 2019, 07:48:54 AM

Title: API 2503 transformer
Post by: iprovlek on April 11, 2019, 07:48:54 AM
All thanks to CJ, Aaron from DonAudio....

I use Edcor EI63 lams,Edcor bobbins, and Litz wire from Germany(PACK Litz wire)....
Title: Re: API 2503 transformer
Post by: iprovlek on April 11, 2019, 07:50:08 AM
20 pieces...for my 16 channel API style console!!!
Title: Re: API 2503 transformer
Post by: iprovlek on April 11, 2019, 07:52:23 AM
...
Title: Re: API 2503 transformer
Post by: [silent:arts] on April 11, 2019, 07:59:42 AM
They look great, congrats!
Title: Re: API 2503 transformer
Post by: iprovlek on April 11, 2019, 10:07:13 AM
Thanks Volker!
Title: Re: API 2503 transformer
Post by: TillM on April 11, 2019, 02:02:16 PM
like Volker said, really good work !
Title: Re: API 2503 transformer
Post by: iprovlek on April 12, 2019, 04:52:36 AM
Thanks Tillm....
Title: Re: API 2503 transformer
Post by: Anthon on May 31, 2019, 06:40:16 PM
Nice, I want to build an API style console myself eventually. Winding your own transformers should save a huge amount of money.
Is there like a recipe to follow, or did you design it from scratch? I get how the turns ratio works, but I guess it's more complicated than that, if you want to make a high performance transformer.

As a matter of fact, I've just received my CNC coil winder, so I want to try out transformer building as well  ;D
Title: Re: API 2503 transformer
Post by: iprovlek on June 01, 2019, 03:31:07 AM
Hi Anthon!!!

Yes winding your own trannies saves the money a lot....

It is built from scratch and CJ recipe!!! ALL THANKS TO CJ!!!

Here is link where recipe can be found.

https://vacuumbrain.uk

And this trannie is very simple to make!

It is quadrifilar type of trannie!!!

Title: Re: API 2503 transformer
Post by: Anthon on June 01, 2019, 04:35:52 AM
Thanks a lot! Seems like straightforward enough.

And you've ordered the Litz wire form here https://www.packlitzwire.com/ (https://www.packlitzwire.com/)
I guess if you are making a lot of them, then it's a worth while ordering  a premade wire. Was it their standard stock, or a custom order?

Are you also making the input transformers yourself?
Title: Re: API 2503 transformer
Post by: iprovlek on June 01, 2019, 05:24:10 AM
Yes that is company that doing wires from 1939!!!

I asked for this particularly wire 4 twisted 0.28mm gauge wire!!!

Isn't that cheap wire but it worth it! Especial when you doing lot of them...


I didn't made any input trannie but that is My next wish!!!


You have recipe for input for API on CJ site that I sent you!!!

I did API 1604 inspired 16 channels mixer, lots of job,time,money and endless soldering...

So need it lot of trannies....
Title: Re: API 2503 transformer
Post by: Anthon on June 01, 2019, 07:39:46 AM
I wonder if a coil winder can be used to twist litz wire.
For instance, you want 2.5 turns per inch, you take 4 strands of 1000 inch  each, fasten them to the bobbin part of the winder, give it tension, and program it to make 2500 turns at moderate speed.

I know it works well for short wires, but I have no idea how it will work for large lengths.

Yes, a DIY recording console seems like the mount Everest of DIY audio. But I guess that's what makes it exiting.
I would go there eventually, probably also something 'small and simple' like API 1604.  ;D
Title: Re: API 2503 transformer
Post by: iprovlek on June 02, 2019, 12:45:13 PM
I know that power drill can be great for this purpose....
Title: Re: API 2503 transformer
Post by: Anthon on June 02, 2019, 02:26:21 PM
I know that power drill can be great for this purpose....

I suppose so, but then you would need a way to count the amount of twists you made. So you either have to count every turn of the power drill, or estimate the amount by counting small segments, so you would need to stop from time to time to check if you have the required amount of turns.

It would be nice to know the exact amount of twists you make without counting the actual twists on the wire, for the sake of simplicity and consistency.
Title: Re: API 2503 transformer
Post by: boji on June 10, 2019, 01:32:27 AM
Just saw this. Looking good! 
Title: Re: API 2503 transformer
Post by: rmburrow on June 10, 2019, 11:20:38 AM
I suppose so, but then you would need a way to count the amount of twists you made. So you either have to count every turn of the power drill, or estimate the amount by counting small segments, so you would need to stop from time to time to check if you have the required amount of turns.

It would be nice to know the exact amount of twists you make without counting the actual twists on the wire, for the sake of simplicity and consistency.

Rig a cheap photocell type counter and slip a cardboard disk with single hole in it on the drill shaft with a focused light shining on the disk...every turn the light should shine through the hole and trigger the counter...
Title: Re: API 2503 transformer
Post by: abbey road d enfer on June 12, 2019, 06:16:12 AM
There are mechanical counters
https://uk.rs-online.com/web/p/mechanical-counters/0166018/
Title: Re: API 2503 transformer
Post by: Moby on June 19, 2019, 03:51:48 PM
Hey mate. I was too busy to check about your progress. Well done :)
Title: Re: API 2503 transformer
Post by: iprovlek on June 20, 2019, 06:15:23 AM
Thanks Moby....

I will do another batch very soon!
Title: Re: API 2503 transformer
Post by: abbey road d enfer on June 20, 2019, 06:30:43 AM
I wonder if a coil winder can be used to twist litz wire.
For instance, you want 2.5 turns per inch, you take 4 strands of 1000 inch  each, fasten them to the bobbin part of the winder, give it tension, and program it to make 2500 turns at moderate speed.
What kind of precision do you need here? Does it matter much? My understanding is you want this for quadfilar winding. I very much doubt the number of turns per unit length matters much. There is no skin effect involved here. I would think the only reason for twisting wires is to help with compactness.
Title: Re: API 2503 transformer
Post by: boji on July 04, 2019, 08:09:12 AM
So comon, iprovlek!   Lets see some more pr0n in action! 

Title: Re: API 2503 transformer
Post by: iprovlek on July 04, 2019, 10:17:30 AM
Be patient Boji....
Title: Re: API 2503 transformer
Post by: CJ on July 06, 2019, 04:17:58 AM
if you use a twist drill, you can time the amount of time the drill runs at the same speed (why not flat out?) to give you the same twists per inch,

using twisted wire instead of quad means you will get the same results no matter which leads you use for color coded hookup wire,

with quad you might be using the two inner wires for pri, or two outer, or 1 and 3, get it?  capacitance might be a little \different between wires, not so with the twisted wire,

Title: Re: API 2503 transformer
Post by: abbey road d enfer on July 06, 2019, 04:36:08 AM
if you use a twist drill, you can time the amount of time the drill runs at the same speed (why not flat out?) to give you the same twists per inch,
Considering the mean turn length of about 4 inches and the total wire length of about 200 ft, a good enough precision can be attained by just looking at the coiled wire.