you may want to check this out...http://www.diyaudio.com/forums/power-supplies/304719-how-do-you-design-power-supplies.html
this is my go to page for power supplies for tube amps...powersupplies
this is my go to page for power supplies for tube amps...powersupplies
Hi, the "recepie" man is back 😉.
I have these two donator transformers both EI-96. The seemingly newer one claims to deliver 400VA and the other one I don't have any information about.
Would measuring the wire diameters give a clue of the VA or are there other aspects to consider? The stack of the newer one is 62mm and 50mm for the other. Both 0,35 mm laminates. Colourwise the newer is much darker and more brittle.
Could I mix laminates if they are of different permeability to even them out? This to make two equal transformers?
Regards
I have these two donator transformers both EI-96. The seemingly newer one claims to deliver 400VA and the other one I don't have any information about.
Would measuring the wire diameters give a clue of the VA or are there other aspects to consider? The stack of the newer one is 62mm and 50mm for the other. Both 0,35 mm laminates. Colourwise the newer is much darker and more brittle.
Could I mix laminates if they are of different permeability to even them out? This to make two equal transformers?
Regards
Too late to edit. But I do have an idea of checking the VA of the older transformer that I will check and of course the wire diams are part of the equation 🙂
The question about mixing laminates stands...
Regards
The question about mixing laminates stands...
Regards
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400VA out of a EI96 core? Seems a little bit optimistic. What's the stack height?
Best regards!
It's in the text 62mm... Super laminates arn't they 🙂
BTW, I started another thread about this some 20 min ago as it is more about what is proven possible without relying on trial and error or gut feel designing. The subject starts with EI-96...
Regards
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That corresponds to the standard EI96c core. For this one Swiss lamination manufacturer Wagner+Grimm gives a rating of 250VA for M111-35 (M6X) GOSS laminations.
Best regards!
Best regards!
Hi Kay Pirinha.
Found it. I will look for more donators so I will not mix the grades - so still hunting 🙂
Regards
Found it. I will look for more donators so I will not mix the grades - so still hunting 🙂
Regards
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what is the thickness of the laminations?
1 1/4 stacked to 62mm is 320 volt amperes as per RDH4....
you can of course draw more but the results is a much hotter traffo...
Sir Tony i have found upon one of my Toroid trafo that i dismantled due to open secondary winding. I had found out that the wire used is enameled aluminum wire instead of copper wire.
How efficient are these compared to copper?
I had also other trafo from china that used aluminum wire.I had rewinded the trafo using same number of turns but uses copper and it still reads the same voltages as the aluminum.
How efficient are these compared to copper?
I had also other trafo from china that used aluminum wire.I had rewinded the trafo using same number of turns but uses copper and it still reads the same voltages as the aluminum.
the Volts/Turn stays constant.
It does not depend on the material.
The resistance does depend on the material.
Copper will have lower resistance and thus less heat.
Copper will also have lower regulation (the amount the output changes with changes in current level).
It does not depend on the material.
The resistance does depend on the material.
Copper will have lower resistance and thus less heat.
Copper will also have lower regulation (the amount the output changes with changes in current level).
JunM, those aluminum cored wires are now slowly getting available in manila, but i an not using those in my traffo, i would prefer pure copper....
but so you know, the technique have been used for a at least 50 years now in our very high voltage transmission lines, ACSR, aluminum cable steel reinforced......aluminum is also a good conductor and has lower weight than copper...
copper has a density of 0.33 lbs/cu inch, while aluminum 0.098 easily a three to one ratio...
but so you know, the technique have been used for a at least 50 years now in our very high voltage transmission lines, ACSR, aluminum cable steel reinforced......aluminum is also a good conductor and has lower weight than copper...
copper has a density of 0.33 lbs/cu inch, while aluminum 0.098 easily a three to one ratio...
Yes, a trafo with an aluminium wire winding will be slightly lighter. But you need more winding space to comp the decreased conductivity.
Best regards!
Best regards!
Thanks for feedback. So now it's okay to retain the old aluminum wire. I plan to change it to copper. So i'll just save it for other trafos.
i have about 3kgs of copper wire that i took out from your japanese iso traffo,
if you want, i can give them back to you as i do not have any use for those at this time...