Article View: uk.tech.digital-tv
Article #15Re: Using mobile phone as an internet radio
From: Jeff Liebermann
Date: Mon, 08 Oct 2012 04:00
Date: Mon, 08 Oct 2012 04:00
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3663 bytes
On 6 Oct 2012 23:31:51 GMT, Jasen Betts <jasen@xnet.co.nz> wrote: >yeah, it would be a good project for the mythbusters, I'd love to see >a slow motion film of an incandescent lamp failing at turn-on. >but could they affor do dedicate their fast camera for long enough. Due to the apparently lack of data and my curiosity, I was thinking of throwing together a crude experiment. Two lamp bases, two 40 watt clear envelope incandescent lamps, two SSS (solid state switches), and some kind of pulse generator. 30 seconds on should be enough to get the filament hot enough for sublimation. 30 seconds off should be enough for it to cool down for a cold start (I need to check this with an IR thermometer). However, I have no intention of running this test for 1000+ hours. Instead, an accelerated life test can be done with higher than normal voltages. <http://www.welchallyn.com/documents/Lighting/OEM_Halogen_Lighting/MC3544HPX_Catalog_2_11_09.pdf> For halogen bulbs, they use: Life = (Vdesign / Vapplied)^12.0 * Life at design voltage For a 1000 hr lamp running at 120% of the rated voltage, the life might be: life = (1/1.2)^12 * 1000 = 112 hrs which is more reasonable for my tinkering and for Mythbusters. With power cycling, the life will be even less. I should have a Variac somewhere in my junk pile. -- 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: Sun, 07 Oct 2012 21:00:30 -0700
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