In article ,
Phil Allison wrote:
DC measurements can give a guide to the turns ratio but not the
impedance.


** That is quite wrong.

With small to medium audio transformers, the rated impedance of a
winding = 10 to 20 times the DC resistance.

This fact derives directly from the *efficiency* of such transformers
being around 80% to 90 %.

The LT44 complies.

It might well do. But it's not a rule of thumb I'd rely on for all
transformers.

--
*If a thing is worth doing, wouldn't it have been done already?

Dave Plowman London SW
To e-mail, change noise into sound.