Article View: sci.electronics.components
Article #96Re: Best way to power array of LEDs?
From: Watson 'Atto Parsec' Name
Date: Thu, 05 Dec 2002 05:00
Date: Thu, 05 Dec 2002 05:00
44 lines
3313 bytes
3313 bytes
In article <3DEDB1CD.EF3761C7@fanwap.com>, tong@fanwap.com talked about... > LED look like simple but it is not simple. > In theory, you can't parallel LEDs. > But in practicle, I can parallel superbright LEDs. > Many car brake light, they parallel them too. > I mixed by parallel 3.4v 3.5v 3.6v 3.01v (forward voltage LEDs @20mA) > with a 3.6v regulator. > The forward current will vary automatic with the increment of > the input voltage. > the one 3.01v won't hog all current as someone said in this thread. > 3.01v take ~150mA > 3.4v take ~60mA > 3.5 take ~40mA > 3.6 take ~20mA The above shows that the lower voltage LEDs hog most of the current. > when remove the 3.01v LED, another LEDs still take the current > at the same value. > So. You can mix it in parallel. The lowest forward voltage LED > will not hog all current. Well you just showed values that contradict what you say. > Tong [snip] -- @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@ My email address is whitelisted. *All* email sent to it goes directly to the trash unless you put NOSPAM in the Subject: line. alondra101 <at> hotmail.com Don't be ripped off by the big book dealers. Go to the URL that will give you a choice and save you money(up to half). http://www.everybookstore.com You'll be glad you did! Just when you thought you had all this figured out, the gov't changed it: http://physics.nist.gov/cuu/Units/binary.html @@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,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-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2002-12-04 21:01:27 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed1.cidera.com!Cidera!news.inreach.com!not-for-mail From: Watson 'Atto Parsec' Name <alondra101@hotmail.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? Message-ID: <MPG.18587d42aa1ac00e989db9@news.inreach.net> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <ank9ep$lumv$1@hades.csu.net> <anku2n$5so$1@news.wave.co.nz> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <apvlvu$n2c$1@reader1.panix.com> <KVdHjAAjM3w9Ew8l@jmwa.demon.co.uk> <aq17gb$7ut$1@reader1.panix.com> <slrnasg1o7.1t5.Znospam+noZs_0211@hpb13799Z.Zboi.hpZ.com.invalid> <aseln1$jbb$1@reader1.panix.com> <Rm2H9.4457$5P3.213056@newsfeed.slurp.net> <4dqpuugil5jens3iu7uprml0hdjl5e5dqs@4ax.com> <3DEDB1CD.EF3761C7@fanwap.com> X-Newsreader: MicroPlanet Gravity v2.60 Lines: 44 Date: Wed, 4 Dec 2002 21:00:20 -0800 NNTP-Posting-Host: 209.209.65.213 X-Trace: news.inreach.com 1039068081 209.209.65.213 (Wed, 04 Dec 2002 22:01:21 PST) NNTP-Posting-Date: Wed, 04 Dec 2002 22:01:21 PST Organization: InReach Internet