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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: John R Walliker <jrwalliker@gmail.com> Newsgroups: sci.electronics.design Subject: Re: heating a cap Date: Fri, 4 Oct 2024 19:15:14 +0100 Organization: A noiseless patient Spider Lines: 23 Message-ID: <vdpbbj$ag9n$1@dont-email.me> References: <e0aufj92e8200qiirc12bdnocsf1ertiut@4ax.com> <qn70gj9jagbgb5a24ga6ir32mn846hf3qu@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 04 Oct 2024 20:15:16 +0200 (CEST) Injection-Info: dont-email.me; posting-host="d3efbd251d4e2c498305f4d410d4d60a"; logging-data="344375"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/3hdxfVOvPnR7Sfsdq3BgkoEsYuLLugew=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:BaQO164iXU8fDcJTu++h38vQybY= In-Reply-To: <qn70gj9jagbgb5a24ga6ir32mn846hf3qu@4ax.com> Content-Language: en-GB Bytes: 1960 On 04/10/2024 18:00, Cursitor Doom wrote: > On Thu, 03 Oct 2024 16:36:24 -0700, john larkin <jl@glen--canyon.com> > wrote: > >> I got a small (under 1" long) aluminum electro cap, 220 uF 63v, and >> cranked up the voltage. It started drawing a bunch of current at 105 >> volts, got hot, and folded back to 80 mA at 87v. >> >> It got too hot to touch in a couple of minutes, after roughly 500 >> joules. Freeze spray let it go back up to 100 volts or so. >> >> None of that seemed to damage it, so an electrolytic cap sort of has a >> built-in MOV. > > That's a hell of sweeping conclusion to come to based on a test of > just one random electrolytic! I once tried heating a large electrolytic salvaged from a valve TV. With a blowtorch. The side started to bulge, then it split. A large flame maybe 1m long emerged, coloured a brilliant green. I was wearing safety glasses. John