Phil Allison said:
** What Rod Elliot wrote above is **completely correct**
- backed up by actual measurements and published data you
can find in the supplied links.
Time the posturing pommy Wanker learned to bloody read !!!!
You are the one who should learn to read. I plainly stated
and backed up with theory and measurements that the reason
Rod observed such bad performance is because the transformer
manufacturers have taken liberties with their small versions.
(Rod measured merely these poor "standard" designs, without
critically analyzing them. You took his word as gospel.)
First, they make them less efficient than their larger ones,
and as we observed in threads past, this is rather grossly
apparent from observing the low copper-filling factor on the
bobbins. Second, to save money they avoided using very simple
techniques available for small low-power transformers, such as
more turns, to dramatically lower quiescent primary current.
The cost of making the changes I see necessary is not zero,
but it's quite small, perhaps 20% at most. But consider, if
a rule is passed mandating the changes, all the manufacturers
will be in the same place, and can make the changes without
suffering any disadvantage. (That's the very useful role that
a government and a regulator can play that industry can't do,
or has a hard time doing, unless a strong standards body gets
involved, for example.)
It's my belief the regulators consulted first with several
manufacturers to determine the feasibility before proceeding.
Or perhaps they read the relevant threads here on s.e.d.
