Transformer identification

[The Dark force of dance]

Y-ellow Paul 'n'  y'all.

At 06:08 PM 08/11/99 +1000, Paul Perry wrote:

>I suspect he is just going by the weight. The VA depends partly on how hot 
>you are prepared to run the transformer. If you assume that most 
>ordinary laminated transformers are pretty similar in geometry, you cant
>go far wrong. Especially as all he has to do is guarantee that a 
>particular transformer will give x amps without getting 'too' hot.
>If he was completely fanatical he could make a load out of old stove
elements.

Yup that sound furry muff. That's basically how I do it. But then you get
these weird telecom  transformers. Relatively huge heavy things rated at
300mA? Now we can assume that they're seriously over engineered but what
seems to be the case is that they have huge cores and lots of wire, but
it's all really thin windings. 

Like. Judging from the size and weight you could run at least a 50 watt amp
from it but you know that's just not going to happen. Which is a bugger
because I once collected a hell of a lot of 'em with a view to do just
that. Weren't I disappointed. :(

Another thought had crossed my mind  was  that I'm wondering if you
couldn't measure the external  magnetic field under load or something. I'm
not entirely sure how you could do this but it just struck me that the
apparent field would change under load. And I know transformers have a sag
in them. though I'm not sure how this would be useful either since it's
more or less  linear. If  there was a knee at optimum  efficiency or
something then that might be useful.

It would be nice to work out a way of doing this.

Anyway thanks again.

be absolutely Icebox.

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