Re: heating a cap

Liste des GroupesRevenir à se design 
Sujet : Re: heating a cap
De : jl (at) *nospam* glen--canyon.com (john larkin)
Groupes : sci.electronics.design
Date : 04. Oct 2024, 20:44:36
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <nrd0gjlumh4sl9697q9erhku8od1tt9ld0@4ax.com>
References : 1 2
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On Fri, 04 Oct 2024 18:00:51 +0100, Cursitor Doom <cd@notformail.com>
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!

It's more data than no experiment would provide.

Elecs seem to explode from internal steam pressure, which sounds
fairly predictable.

But other people here could try it too.

Film caps fail suddenly at some large multiple of rated voltage.
Ceramics too, but some start leaking first.

Is seems like elecs start to leak seriously at about 1.5x rated
voltage and die from overheating.


Date Sujet#  Auteur
4 Oct 24 * heating a cap34john larkin
4 Oct 24 +- Re: heating a cap1Joe Gwinn
4 Oct 24 +* Re: heating a cap5John Robertson
4 Oct 24 i`* Re: heating a cap4john larkin
4 Oct 24 i +- Re: heating a cap1Phil Hobbs
4 Oct 24 i `* Re: heating a cap2Cursitor Doom
4 Oct 24 i  `- Re: heating a cap1john larkin
4 Oct 24 +* Re: heating a cap19legg
4 Oct 24 i`* Re: heating a cap18john larkin
5 Oct 24 i `* Re: heating a cap17Cursitor Doom
5 Oct 24 i  `* Re: heating a cap16john larkin
5 Oct 24 i   +* Re: heating a cap10Jan Panteltje
5 Oct 24 i   i`* Re: heating a cap9john larkin
5 Oct 24 i   i `* Re: heating a cap8Cursitor Doom
5 Oct 24 i   i  `* Re: heating a cap7john larkin
5 Oct 24 i   i   +- Re: heating a cap1Joe Gwinn
6 Oct 24 i   i   `* Re: heating a cap5legg
6 Oct 24 i   i    `* Re: heating a cap4john larkin
6 Oct 24 i   i     `* Re: heating a cap3legg
6 Oct 24 i   i      `* Re: heating a cap2john larkin
7 Oct 24 i   i       `- Re: heating a cap1Bill Sloman
5 Oct 24 i   `* Re: heating a cap5Cursitor Doom
5 Oct 24 i    `* Re: heating a cap4john larkin
5 Oct 24 i     `* Re: heating a cap3Cursitor Doom
7 Oct 24 i      `* Re: heating a cap2john larkin
8 Oct 24 i       `- Re: heating a cap1Bill Sloman
4 Oct 24 +* Re: heating a cap5Cursitor Doom
4 Oct 24 i+* Re: heating a cap2John R Walliker
4 Oct 24 ii`- Re: heating a cap1john larkin
4 Oct 24 i`* Re: heating a cap2john larkin
5 Oct 24 i `- Re: heating a cap1Bill Sloman
5 Oct 24 `* Re: heating a cap3Clive Arthur
5 Oct 24  +- Re: heating a cap1Jan Panteltje
5 Oct 24  `- Re: heating a cap1john larkin

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