Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Lasse Langwadt <llc@fonz.dk>
Newsgroups: sci.electronics.design
Subject: Re: solderig enamelled wire, problems.
Date: Tue, 24 Jun 2025 22:41:20 +0200
Organization: A noiseless patient Spider
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On 6/23/25 12:21, 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.
> 

are you sure it is copper and not copper coated aluminium?