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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 12:24:57 +0100
Organization: Poppy Records
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<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.


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