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Article #127Re: Best way to power array of LEDs?
From: Lizard Blizzard
Date: Thu, 07 Nov 2002 16:44
Date: Thu, 07 Nov 2002 16:44
34 lines
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3017 bytes
Nucharin W. Jansen wrote: > http://www.ResurgentSoftware.com/Perfect_LED_Light.html > He parallels all LEDs together without any resistor to > constant voltage regulator. If you read the rest of it, he says that the LEDs are all run at substantially below their maximum current to get better efficiency. Something like 8 mA, in one of his designs. So if you have one LED that has substantially lower Vf, and it decides to hog twice the current, then it's still only 16 mA, which is well below the maximum, so no big deal. But putting LEDs in parallel without Vf matching and running them at or near maximum is just an invitation for self-destruction. > At last week, I thought the same as him but I plan to do with > MAX757 ( DIP300 ) stepup IC from batt only 1 or 2 cells. > But after read several articles here, I get confuse so much. > ^_^ -- ----------------(from OED Mini-Dictionary)----------------- PUNCTUATION - Apostrophe Incorrect uses: (i) the apostrophe must not be used with a plural where there is no possessive sense, as in ~tea's are served here~; (ii) there is no such word as ~her's, our's, their's, your's~. Confusions: it's = it is or it has (not 'belonging to it'); correct uses are ~it's here~ (= it is here); ~it's gone~ (= it has gone); but ~the dog wagged its tail~ (no apostrophe). ----------------(For the Apostrophe challenged)---------------- From a fully deputized officer of the Apostrophe Police!
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2002-11-07 08:47:07 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!logbridge.uoregon.edu!tethys.csu.net!newshub.csu.net!not-for-mail From: Lizard Blizzard <NOSPAM@rsccd.org> 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: Thu, 07 Nov 2002 08:44:39 -0800 Organization: CSUnet Lines: 35 Message-ID: <aqe562$10bf9$1@hades.csu.net> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <2Qan9.3129$cS4.107732@news2.tin.it> <3DC843FE.4A25FFF3@fanwap.com> <aqblsd$10119$1@hades.csu.net> <3DC99AD4.2AB0FE52@fanwap.com> <3DC9A173.812F4764@fanwap.com> <3DC9B37F.453F9C41@fanwap.com> NNTP-Posting-Host: 204.75.249.20 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826 X-Accept-Language: en-us, en