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Article #266Re: Best way to power array of LEDs?
From: budgie
Date: Sun, 06 Oct 2002 05:41
Date: Sun, 06 Oct 2002 05:41
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2497 bytes
On Sun, 6 Oct 2002 04:54:42 +0000 (UTC), don@manx.misty.com (Don Klipstein) wrote: >In article <anlb3a$lvte$1@hades.csu.net>, Lizard Blizzard wrote: >>budgie wrote: >> >><Snip> >> >>> In the auto situation, the simplest mitigation is to feed the >>> resistor/LED chain thru an LM317 configured as a constant current >>> source. Just the IC and one resistor added, and no voltage variation >>> issue. >> >>The LM317 has a minimum current which may be greater than a single LED >>can handle. It will work good for a hundred mA or more. > > In my experience, the LM317 (or maybe it's the LM317T) makes a decent >20 mA regulator. I use one in my "handy-dandy-standard" LED tester. They are a superb device as a current source. The 317T (TO220) is good for ~1.5A while the TO92 version is ~100mA.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2002-10-05 22:45:24 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news1.optus.net.au!optus!news.uwa.edu.au!nntp.waia.asn.au!nnrp.waia.asn.au!not-for-mail From: budgie@nowhere.cantech.net.au (budgie) Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Sun, 06 Oct 2002 05:41:09 GMT Organization: CanTech Online Lines: 21 Message-ID: <3d9fcc81.2011836@news.cantech.net.au> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <3d9d452f.4128065@news.xs4all.nl> <P0HAA5Jd3Un9EwWS@ntlworld.com> <3d9d5392.5143261@news.cantech.net.au> <anlb3a$lvte$1@hades.csu.net> <slrnapvgpf.hah.don@manx.misty.com> NNTP-Posting-Host: proteus.cantech.net.au X-Trace: nnrp.waia.asn.au 1033882775 3151 203.26.6.6 (6 Oct 2002 05:39:35 GMT) X-Complaints-To: usenet@nnrp.waia.asn.au NNTP-Posting-Date: Sun, 6 Oct 2002 05:39:35 +0000 (UTC) X-Newsreader: Forte Free Agent 1.21/32.243 Cache-Post-Path: proteus.cantech.net.au!unknown@ra118.cantech.net.au X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/)