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Old 8th March 2013, 01:44 PM   #121
TheGimp is offline TheGimp  United States
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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.
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Old 8th March 2013, 01:50 PM   #122
iko is offline iko  Canada
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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.
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Old 8th March 2013, 02:27 PM   #123
popilin is offline popilin  Argentina
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I think this is a good reason to wind our own transformers.

Servicing of a Hiwatt DR405 400 Watt (Clone Amplifier
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Old 8th March 2013, 02:59 PM   #124
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Quote:
Originally Posted by TheGimp View Post
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

Last edited by esltransformer; 8th March 2013 at 03:09 PM. Reason: + extra info
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Old 8th March 2013, 03:11 PM   #125
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Quote:
Originally Posted by popilin View Post
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 :-)
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Old 8th March 2013, 03:51 PM   #127
popilin is offline popilin  Argentina
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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.

Quote:
Originally Posted by Osvaldo de Banfield View Post
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..."
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Old 8th March 2013, 04:24 PM   #128
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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 "PorteŮo Language", ja ja ja...

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Old 8th March 2013, 04:40 PM   #129
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Originally Posted by popilin View Post
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
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Old 8th March 2013, 06:22 PM   #130
TheGimp is offline TheGimp  United States
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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%).

Last edited by TheGimp; 8th March 2013 at 06:31 PM. Reason: Look up 316SS properties
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