Article View: sci.electronics.components
Article #164Re: Best way to power array of LEDs?
From: ehsjr
Date: Tue, 05 Nov 2002 15:41
Date: Tue, 05 Nov 2002 15:41
257 lines
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17313 bytes
Winfield Hill wrote: > > ehsjr@bellatlantic.net wrote... > > > >Winfield Hill wrote: > > > >> I was taught to make efficient designs by insuring every part > >> has a purpose and carries its own weight. With that in mind, > >> here's my entry, a slim 32-channel adjustable current source. > > > > Where's the remote current sensing/ individual current > > auto-adjusting circuit for each LED? > > Oh, sorry, I've fixed it now. Nice! :-) > > . 12V etc 4.7k 68 2W gnd > . ,---/\/\-----+--- E C --/\/\----+------------, > . | | B | | > . | LM385-1.2 B | 3.3k | | Vref > . +---|>]--- E C ---x----/\/\-----+ _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---+ | > . | ,----|----/\/\---|--------|---+-< | | | > . | | B LED | | | \-|-+-|--/\/\--+ > . +--/\/\-+- E C ---|>|--+--/\/\--+ === | | | > . | | PD ,-|<|---------+ | | | | > . | | '-------------|---+------' | | > . | | | _ | | > . | | ,--------|--o /+|---' | > . | ,----|----/\/\---|--------|---+-< | | > . | | B LED | | | \-|-+----/\/\--' > . '--/\/\-+- E C ---|>|--+--/\/\--+ === | > . PD ,-|<|---------' | | > . '-----------------+------' > > Thanks, > - Win
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-ArrivalTime: 2002-11-05 07:42:00 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!lnsnews.lns.cornell.edu!newsstand.cit.cornell.edu!ngpeer.news.aol.com!cyclone1.gnilink.net!spamfinder.gnilink.net!nwrddc03.gnilink.net.POSTED!53ab2750!not-for-mail Message-ID: <3DC7E6B9.8DCBAF0F@bellatlantic.net> From: ehsjr@bellatlantic.net Reply-To: ehsjr@bellatlantic.net X-Mailer: Mozilla 4.75 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <ank9ep$lumv$1@hades.csu.net> <anku2n$5so$1@news.wave.co.nz> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <apvlvu$n2c$1@reader1.panix.com> <KVdHjAAjM3w9Ew8l@jmwa.demon.co.uk> <aq17gb$7ut$1@reader1.panix.com> <aq1ckv02qbk@drn.newsguy.com> <3DC6F8DC.CF94292A@bellatlantic.net> <aq7f2c01co0@drn.newsguy.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 257 Date: Tue, 05 Nov 2002 15:41:58 GMT NNTP-Posting-Host: 162.84.134.190 X-Complaints-To: abuse@verizon.net X-Trace: nwrddc03.gnilink.net 1036510918 162.84.134.190 (Tue, 05 Nov 2002 10:41:58 EST) NNTP-Posting-Date: Tue, 05 Nov 2002 10:41:58 EST