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Article #267Re: Best way to power array of LEDs?
From: Tilmann Reh
Date: Fri, 04 Oct 2002 06:19
Date: Fri, 04 Oct 2002 06:19
39 lines
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2853 bytes
DaveC schrieb: > > Have assembled an array of LEDs for use as a 3rd brake light in my car, > configured as 4 rows of 9 jumbo LEDs, as of yet unwired. Of course the power > supply will be 12 volts nominal (13.8 volts, maximum). > > My options, as I see them, are: > 1) Wire individual resistors to each LED based on its operating current > 2) Wire each row in parallel and connect one resistor based on operating > current for 9 LEDs > 3) Install voltage regulator to output voltage (ie, 1.3 volts?) to operate > all LEDs in parallel. > > What is the best method to power these from an intermittent (whenever I press > the brake pedal) power source? Better use many LEDs in series to avoid unnecessary power loss. With 12V supply, you can use about 5 LEDs in series and a smaller resistor for each chain. These chains are then connected in parallel. Dipl.-Ing. Tilmann Reh Autometer GmbH Siegen - Elektronik nach Maß. http://www.autometer.de ================================================================== In a world without walls and fences, who needs Windows and Gates ? (Sun Microsystems)
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X-Google-Language: ENGLISH,ASCII X-Google-Thread: 112d1e,4ef4c9d4aea85e1f,start X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f,start X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f,start X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,4ef4c9d4aea85e1f,start X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f,start X-Google-Attributes: gid1118be,public X-Google-ArrivalTime: 2002-10-03 23:17:29 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!193.174.75.178!news-fra1.dfn.de!news-stu1.dfn.de!news.belwue.de!news.uni-stuttgart.de!rz.uni-karlsruhe.de!schlund.de!news.online.de!not-for-mail From: Tilmann Reh <tilmann.reh@autometer.de> 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: Fri, 04 Oct 2002 08:19:10 +0200 Organization: Autometer GmbH Lines: 39 Message-ID: <3D9D32DE.93168158@autometer.de> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> NNTP-Posting-Host: pd9e5f186.dip0.t-ipconnect.de Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: news.online.de 1033712247 30939 217.229.241.134 (4 Oct 2002 06:17:27 GMT) X-Complaints-To: abuse@online.de NNTP-Posting-Date: 4 Oct 2002 06:17:27 GMT X-Mailer: Mozilla 4.78 [de] (Win98; U) X-Accept-Language: de