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Article #172Re: Best way to power array of LEDs?
From: Nucharin W. Jansen
Date: Tue, 05 Nov 2002 22:58
Date: Tue, 05 Nov 2002 22:58
38 lines
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2998 bytes
I see. I will use switching current regulator now. --snip-- >LEDs are not about voltage. They don't care about voltage. I've run them at >2.5V. I've run them at 120V AC. LEDs are current devices and have a brighter >response to more current. So any LED supply is about current management. You are absolutely right. This question about Voltage and LEDs just keeps coming up time and time again! You'd think that those posing it would take the trouble to learn the most elementary basics of what they are trying to work with. To make the principles perfectly clear, LEDs emit photons in an approximate ratio of the amount of CURRENT (hear that?...**current!!) that passses through them. Voltage isn't even in the equation!! The voltage that appears across an LED is a RESULT of the current that you are pushing through it, not the other way around!. Like any diode, this voltage (called the forward voltage) tends to be relatively constant, and relatively independent of the current. But (watch my lips closely, now!) the value of this voltage is basically irrelivant! Forget about it! Don't even mention the "V" word when dealing with LEDs! There! Got that off my chest. Bob.
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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: 2002-11-05 15:00:12 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!nntp.cs.ubc.ca!nntp-relay.ihug.net!ihug.co.nz!newshosting.com!news-xfer1.atl.newshosting.com!uunet!dca.uu.net!news.cscoms.com!not-for-mail From: "Nucharin W. Jansen" <tong@fanwap.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: Wed, 06 Nov 2002 05:58:14 +0700 Organization: C.S. Communications Co. Ltd. Lines: 38 Message-ID: <3DC84D06.4F43DDE9@fanwap.com> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Qrhn9.27982$kd3.80464@news-server.bigpond.net.au> <ankgoh$oq0@cleon.cc.gatech.edu> <h6hvpu8hnhuag56b3rr5sqlompgmj984dm@4ax.com> <anqolb$pj2@cleon.cc.gatech.edu> <uq4go871avfd4e@corp.supernews.com> NNTP-Posting-Host: dial-12.ras-31.bkk.c.cscoms.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.cscoms.com 1036537097 63677 202.183.254.107 (5 Nov 2002 22:58:17 GMT) X-Complaints-To: abuse@cscoms.com NNTP-Posting-Date: Tue, 5 Nov 2002 22:58:17 +0000 (UTC) To: Bob Wilson <rfwilson@intergate.nospam.bc.ca> X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U) X-Accept-Language: en