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NNTP-Posting-Date: Tue, 24 Jun 2025 22:29:01 +0000
From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: solderig enamelled wire, problems.
Date: Tue, 24 Jun 2025 18:28:42 -0400
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On Tue, 24 Jun 2025 22:41:20 +0200, Lasse Langwadt <llc@fonz.dk>
wrote:

>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?

Wouldn't the aluminum reveal itself by melting?

Joe