whit3rd wrote:

On Friday, February 13, 2015 at 4:01:02 PM UTC-8, Phil Allison wrote:
whit3rd wrote:

I think he was confused. Look at a transformer-style soldering gun,
the hairpin secondary doesn't have ANY helical orientation at all,

** Huh ?

See hi-res pic of soldering gun tranny.

http://en.wikipedia.org/wiki/Soldering_gun

Note use of copper strip and close coupling of the secondary.

That's NOT a hairpin secondary! Look instead at this

https://plus.google.com/photos/118343199678883181101/albums/6115815766613132033/6115815770882958370?banner=pwa&pid=611581577088295 8370&oid=118343199678883181101


** So it's a one turn secondary on a toroidal core.

Magnetic coupling will be poor, but still good enough for a soldering tool.


Even if the transformer manufacturer works on good flux coupling, the external
loop of the iron's tip will leak lots of flux;


** Any external flux will come from the iron core, not the loop.

Removing the soldering tip will not eliminate external flux or even reduce it much.



.... Phil