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Old 19th April 2015, 10:00 AM   #1
diyAudio Member
Join Date: Aug 2009
Location: Sacramento
Smile I need a distraction!

Hello All,

I need a distraction! I rather attend a wedding than a funeral.

I went to closet shelf and pulled down an Edcor single ended audio transformer intended for a project that was never built. My question to self was, “What makes this thing work, some kind of black magic”?

My start at answer goes like this. Single ended E I transformers have a gap to soften the saturation. That likely means that the plot of ma current vs Tesla is a curve rather than a straight line. I am thinking a bent knee and a rounded shoulder. My first conceptual model is a sigmoid curve with an inflection point in the middle. The curve to the left of the inflection point is concave up and the curve to the right is concave down. The curve in the center plus and minus of the inflection point resembles a straight line.

See this link. Sigmoid function - Wikipedia, the free encyclopedia

Anybody study this stuff?

The Edcor specifications say that this transformer is 15 watts and has maximum current of 100 ma.
I have a couple more questions, more if people are interested in discussing this topic.

Is the specified 100 ma a maximum idle current? Or what?

What happens if I choose to run this transformer at say 40 ma instead? Some guys select bigger iron in the quest of superior bass performance.

Good Grief
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