Re: Using mobile phone as an internet radio

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#52

From: Jeff Liebermann
Date: Fri, 05 Oct 2012 18:51

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On Thu, 04 Oct 2012 10:03:21 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>> Yep.  As I understand it (possible wrong), AC filaments break in the
>> middle, mostly from vibration flexing.
>
>I don't think so, because there's no mechanism for that, as I said.  The 
>wire is fully annealed at all times, so there's no possibility of 
>progressive fatigue failure.

Oscillating filament light bulb:
<http://www.youtube.com/watch?v=t_DwwNVA-7Q>
Whether the earths magnetic field is strong enough to induce such
oscillations is questionable.

While digging for the apparently mythical lifetime test data on
incandescent light bulbs, I've found numerous theories on why
filaments fail.  Tungsten evaporation, causing hot spots, is the most
common.  One suggested that thermal cycling hardens the tungsten and
makes it brittle.  Another suggested that the inrush current causes a
mechanical shock if it hits at the 60Hz peak, instead of at the zero
crossing.  Yet another speculates that the temperature differential
between the hot filament, and the relatively cold mounting structure
may cause cracking. 

-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: uk.tech.digital-tv,24hoursupport.helpdesk,uk.telecom.mobile,sci.electronics.basics,sci.electronics.repair
Subject: Re: Using mobile phone as an internet radio
Date: Fri, 05 Oct 2012 11:51:28 -0700
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