Litz wire most commonly has polyurethane insulation. This is solderable
- you don't need to strip it!
Just set the soldering iron to a slightly hotter temperature than
normal, then take the iron and common rosin-cored solder wire, and
slowly start tinning the Litz wire, starting from the cut end.
By starting from the end, rather than some distance away from it, you
immediately tin the end surfaces of each tiny wire, thus coupling a lot
of heat into the copper. That way the film insulation gets heated from
the inside and the outside, making it melt down rather quickly.
Instead if you try tinning the Litz wire at a point where it hasn't been
cut, you are only applying heat to the outside of the exposed isulation
film sections, while inside them the copper quickly carries the heat
away. That makes it far harder to solder through the insulation.
Manfred
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