Designing an Interstage Transformer

[TheGimp]

The tool is $465. To me that is pricy.

Certainly it is not bad for a company producing a significant quantity of transformers. For one-off building it is prohibitive.

[iko]

There was a guy in Greece who posted his monster tube amp not long ago in the forum. He winds his own c-core inductors and he used some sort of wood+screws bracket to press the two halves together. I'm just saying, it can be done without the metal bands. I plan to use zip ties for prototyping.

Edit: but a quick look on epay shows some very affordable banding tools.

[popilin]

I think this is a good reason to wind our own transformers.

Servicing of a Hiwatt DR405 400 Watt (Clone Amplifier

[esltransformer]

Originally Posted by TheGimp

The tool is $465. To me that is pricy.

Certainly it is not bad for a company producing a significant quantity of transformers. For one-off building it is prohibitive.

I use a screwdriver for my straps.

http://www.bridex.ch/schlauchschellen.html
Google Afbeeldingen resultaat voor http://www.blf-filter.de/bilder/spannband_03.jpg

[Osvaldo de Banfield]

Originally Posted by popilin

I think this is a good reason to wind our own transformers.

Servicing of a Hiwatt DR405 400 Watt (Clone Amplifier

This is, for me, not the only reason, understand and know are powerful motive. In fact, I had done some toroidal transformer I soon will try, as I posted in a thread ad hoc. As the first attempt was failed, almost I know what I must NOT to the next time :-)

[iko]

Originally Posted by esltransformer

I use a screwdriver for my straps.

BRIDEX AG - Schlauchschellen - UNEX, rostfreie Schlauchklemmen, Schlauchbriden, Spannbänder, Schnittbandkerne, Breitbandschellen, Gelenkbolzenschellen, stainless steel hose clamps, clamps, hoseclips, brides inox, brides
Google Afbeeldingen resultaat voor http://www.blf-filter.de/bilder/spannband_03.jpg

Great idea! Thanks!

[popilin]

Originally Posted by esltransformer

I use a screwdriver for my straps.

BRIDEX AG - Schlauchschellen - UNEX, rostfreie Schlauchklemmen, Schlauchbriden, Spannbänder, Schnittbandkerne, Breitbandschellen, Gelenkbolzenschellen, stainless steel hose clamps, clamps, hoseclips, brides inox, brides
Google Afbeeldingen resultaat voor http://www.blf-filter.de/bilder/spannband_03.jpg

I thought so too, but I cringe, not knowing the material properties.

The metal strip follows the path of the magnetic field, without an air gap, it could reach saturation before the core itself, not good news.

I prefer to use L-shaped aluminum, and bolts, externaly.

Originally Posted by Osvaldo de Banfield

This is, for me, not the only reason, understand and know are powerful motive. In fact, I had done some toroidal transformer I soon will try, as I posted in a thread ad hoc. As the first attempt was failed, almost I know what I must NOT to the next time :-)

I chose the hard way, deduce formulas in a more reliable, from Maxwell's equations.

I got tired of books on transformers, "such is the constant for the equations work, blah, blah..."

[Osvaldo de Banfield]

Juan:

Maxwell's formulae doesn't speaks about parasitic inductances nor capacitances nor wiring resistances. They are a starting point, but as magnetic lines can't been see, they are useless in practical designs.

Certainly, sawing a lots of Argentine flags in the forum, in a short time, the rule about English Language must be changed to "Porteño Language", ja ja ja...

Un abrazo a los co-terráneos!

[esltransformer]

Originally Posted by popilin

I thought so too, but I cringe, not knowing the material properties.

The metal strip follows the path of the magnetic field, without an air gap, it could reach saturation before the core itself, not good news.

I prefer to use L-shaped aluminum, and bolts, externaly.



I chose the hard way, deduce formulas in a more reliable, from Maxwell's equations.

I got tired of books on transformers, "such is the constant for the equations work, blah, blah..."

No problem in real world i think. Those strips are available in non magnetic stainless steel and if not, the permeability is to low to give any problems

[TheGimp]

I wonder how well this would work? That is to say, is the SS nonmagnetic? All SS is not.

316 is specified as H=200

Probably due to higher nickle content (10-14%) than say 304 (8%).