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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!border-1.nntp.ord.giganews.com!nntp.giganews.com!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Tue, 24 Jun 2025 22:29:01 +0000 From: Joe Gwinn Newsgroups: sci.electronics.design Subject: Re: solderig enamelled wire, problems. Date: Tue, 24 Jun 2025 18:28:42 -0400 Message-ID: <5j9m5kdidrbleekjtsi66kptimlo5dvsr9@4ax.com> References: <103f2hg$28a5l$1@dont-email.me> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 25 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-HPfUVYwo2PnUR7hoBDmbzYwk2Nnl2RiZZHON5H9zhIeN0p2tdp3zKXHFv2CPxne8/4KUwQ/HYkoxpUE!WCLfcQEIz8ij/N6mBYx6bUYXVB3KUCt8ketM5RKR23gmurLmUt1FOXGiGHo9ajzYqg== X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 On Tue, 24 Jun 2025 22:41:20 +0200, Lasse Langwadt 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