Re: solderig enamelled wire, problems.

Un bel giorno albert@spenarnc.xs4all.nl digitò:

I remember soldering coil/transformer wire was simple in the 70's.
The trick was putting the wire an aspirin tablet and 0.1 mm was no
sweat.
 
Now for the 1v-5v step up converter I followed the advice, and remove
the winding of a 5x5 mm ferrite coil and replaced it with a bifilar
wire with the same number of turns. This was surprisingly easy.
.35 mm wire with 2*.25 wire. (The wire was stolen from a broken
ventilator.)
 
Now I get stuck. I can't solder the wire! The aspirine trick doesn't
work. Burning the insulation turn it into a black coating that
is equally tenacious. Making the copper redhot to burn the coal,
only make the copper to melt.

For single wires I think that the scraping+soldering method is the
quickest. First scrape the wire end with sandpaper, then immerse it in a
bubble of fused solder until the remaining enamel washes off.

For Litz wires I still have to find a good method. The other day I had to
manually solder a Litz wire into a wire lug. Very tedious. If you keep the
wire immersed in a fused solder bubble, and keep adding new solder to add
flux, eventually the coating gives up. But with this technique you waste a
lot of solder, and you need a VERY good ventilation (those fumes are quite
bad for you).

Probably there are specific solvents to do that, but I suppose it depends
on the enamel type. Some say to use acetone, others sodium hydroxide,
others sulfuric acid (which is an hardcore alternative to the aspirin :-)).

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