Article View: sci.electronics.components
Article #137Re: Best way to power array of LEDs?
From: John Woodgate
Date: Thu, 07 Nov 2002 21:41
Date: Thu, 07 Nov 2002 21:41
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2629 bytes
I read in sci.electronics.design that Lizard Blizzard <NOSPAM@rsccd.org> wrote (in <aqeja8$10coe$1@hades.csu.net>) about 'Best way to power array of LEDs?', on Thu, 7 Nov 2002: >Not true. Here's one that's not that complicated and runs a 3.5V white >or blue LED off 4 AA Ni-Cds of from 3.8 to 5.6V depending on their state >of charge. As he says, it requires only 0.2V more than the LEDs. I >modified the If you mean the ASCII art thing you posted before, 2 transistors and 2 resistors is marginal for 'simple' in my book. And the voltage drop must be something over 1.2 V, not 0.2 V. There are two Vbe voltages stacked up. 1.2 is more than 1.09. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-ArrivalTime: 2002-11-07 23:09:13 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!peer1.news.newnet.co.uk!kibo.news.demon.net!news.demon.co.uk!demon!jmwa.demon.co.uk!jmw From: John Woodgate <jmw@jmwa.demon.contraspam.yuk> Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Thu, 7 Nov 2002 21:41:56 +0000 Organization: JMWA Electronics Consultancy Lines: 18 Message-ID: <c$+iZICk4ty9EwN6@jmwa.demon.co.uk> 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> <xNpJlFA42fy9Ewrt@jmwa.demon.co.uk> <aqeja8$10coe$1@hades.csu.net> Reply-To: John Woodgate <jmw@jmwa.demon.co.uk> NNTP-Posting-Host: jmwa.demon.co.uk Mime-Version: 1.0 X-Trace: news.demon.co.uk 1036739353 171 158.152.135.100 (8 Nov 2002 07:09:13 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Fri, 8 Nov 2002 07:09:13 +0000 (UTC) X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>