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From: liz@poppyrecords.invalid.invalid (Liz Tuddenham)
Newsgroups: sci.electronics.design
Subject: Re: solderig enamelled wire, problems.
Date: Mon, 23 Jun 2025 14:05:46 +0100
Organization: Poppy Records
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Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

> Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
> > <albert@spenarnc.xs4all.nl> wrote:
> > 
> >> 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.
> >> 
> >> Groetjes Albert
> > 
> > 
> > Put some methylated spirits or ethanol in a small open metal container
> > such as the lid of a bottle .  Set fire to it and hold the end of the
> > wire in the flame until it is red hot.  Plunge it downwards into the
> > liquid and slide it out sideways so it doesn't get heated a second time.
> > 
> > There will be a chemical reaction between the oxide on the red hot
> > copper and the ethanol, which removes the oxide and leaves the wire
> > bright and clean.
> > 
> > Have a piece of metal ready to put over the container to extinguish the
> > flame and plan in advance how you will deal with the rapidly-spreading
> > fire if you upset the container.  Put the bottle of ethanol some
> > distance away.
> > 
> > 
> 
> Fun. I’ll try it outdoors sometime, but not at my bench!

When I worke at Eddystone Radio, that was the standard method of dealing
with Litz wire.  The meths pot was like an old fashoined whale-oil lamp
with a spout and it was mounted in an asbestos-lined steel box with a
hinged lid that could be flipped down in emergency.

The chief engineer also used it to light his cigarettes.


-- 
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk