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Article #240Re: Best way to power array of LEDs?
From: Alan McClure
Date: Mon, 07 Oct 2002 22:04
Date: Mon, 07 Oct 2002 22:04
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John Gilmer wrote: > Just curious: > > Has anyone here actually taken apart a commercially made LED string that is > powered directly from the automobile nominal 12 volts (up to about 14 volts > during "normal" transients) or from 120 VAC? > > How have the folks who have to honor the warrantees solved the problem? > > EMWTK Yes, and I posted my results 10/5/02 Here they are again: I just opened up a commercial 20 LED cyclops and found 5 banks of 4 LEDs in series with a 220 ohm 1/4 watt resistor. I figure current is about 25 ma. per parallel leg or 125 ma. total. (This is a SWAG) ARM
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-ArrivalTime: 2002-10-07 14:58:59 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!sn-xit-05!sn-xit-06!sn-post-01!supernews.com!corp.supernews.com!not-for-mail From: Alan McClure <mcclures@gwis.com> Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Mon, 07 Oct 2002 18:04:33 -0400 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <3DA204F0.50646B08@gwis.com> X-Mailer: Mozilla 4.79 [en]C-CCK-MCD NSCPCD47 (Win98; U) X-Accept-Language: en MIME-Version: 1.0 References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <2Qan9.3129$cS4.107732@news2.tin.it> <6aa7QNAh$Yn9EwS7@jmwa.demon.co.uk> <ans94t$moab$2@hades.csu.net> <3da1b194$0$7781@dingus.crosslink.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@supernews.com Lines: 25