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Article #278Re: Best way to power array of LEDs?
From: Byron A Jeff
Date: Fri, 04 Oct 2002 11:46
Date: Fri, 04 Oct 2002 11:46
32 lines
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2029 bytes
In article <Rsan9.14070$qh1.1622310@news.ca.inter.net>, Jerry G. <jerryg50@hotmail.com> wrote: -Each LED must have its own series resistor. No necessarily. There are many mechanisms for current limiting. - Most of these LED's work at about 30 to 40 ma Sounds a little high. - with about 1.6 VDC across them. Sounds a little low. - You should be able -to use a 320 ohm 1/2 watt resistor in series with each LED if these are -in the spec range that I used as an example. Still sounds a bit high to me. There's also the issue of brightness. - -LED's cannot be wired in parallel to each other being fed from one -resistor. Right. - They can not also be wired in series with each other. Of course they can. You just need the correct series resistor to sop up the rest of the voltage. BAJ
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2002-10-04 04:55:04 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!snoopy.risq.qc.ca!newsflash.concordia.ca!pitt.edu!news-ext.gatech.edu!news-int.gatech.edu!cc.gatech.edu!byron From: byron@cc.gatech.edu (Byron A Jeff) Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: 4 Oct 2002 07:46:09 -0400 Organization: College of Computing, Georgia Tech Lines: 32 Message-ID: <anjv21$cbr@cleon.cc.gatech.edu> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> NNTP-Posting-Host: cleon.cc.gatech.edu