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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: john larkin <JL@gct.com> Newsgroups: sci.electronics.design Subject: Re: heating a cap Date: Fri, 04 Oct 2024 22:15:50 -0700 Organization: A noiseless patient Spider Lines: 53 Message-ID: <8qi1gj5d27uqdkudv6vfql0fcv273mjcve@4ax.com> References: <e0aufj92e8200qiirc12bdnocsf1ertiut@4ax.com> <ji40gj151ttu840upou8i3jlg2ei0lff75@4ax.com> <0f90gj1ocqo6tm32oe02c9laqukhnp05kj@4ax.com> <58s0gjtnkoghv3nortpbfp24vbdf9ocm4s@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Sat, 05 Oct 2024 07:15:51 +0200 (CEST) Injection-Info: dont-email.me; posting-host="f434fdb690f0f26478851509569954f5"; logging-data="697918"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19K2nK+jsvMhgQtdOMrOUZj" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:4aseNBNaR0OY45ocOjURDYV+nXo= Bytes: 2556 On Fri, 04 Oct 2024 23:50:36 +0100, Cursitor Doom <cd@notformail.com> wrote: >On Fri, 04 Oct 2024 10:31:13 -0700, john larkin <jl@glen--canyon.com> >wrote: > >>On Fri, 04 Oct 2024 12:10:38 -0400, legg <legg@nospam.magma.ca> 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. >>> >>>You're not 'heating a cap'. >> >>Felt hot to me. >> >>> >>>You're applying voltage overstress to failure, using a >>>current limited source. >> >>But it didn't fail. >> >>> >>>This tells you precisely nothing. >> >>Told me a lot. Why elect to not learn things? >> >>> >>>Were you earing safety glasses? >> >>No earrings, and my normal glasses. >> >>> >>>Are you sure you want to advertize this increasingly >>>erratic behavior? >> >>Experimenting with parts is admittedly a bizarre thing for an engineer >>to do. Sorry. > >Legg seems to have a problem on the groups with anyone who isn't an >out-and-out Commie. Just ignore him. There's no reason to not destroy parts. They don't have feelings.