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Article #165Re: Best way to power array of LEDs?
From: GregS
Date: Tue, 05 Nov 2002 15:52
Date: Tue, 05 Nov 2002 15:52
262 lines
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17558 bytes
In article <3DC7E6B9.8DCBAF0F@bellatlantic.net>, ehsjr@bellatlantic.net wrote: > > >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 I don't even like looking at ASCII art let alone think about drawing it! greg
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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: 2002-11-05 07:48:23 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!nntp.cs.ubc.ca!newsflash.concordia.ca!pitt.edu!zipp-vav6hxhozs From: szekeres@pitt.edu (GregS) 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: Tue, 05 Nov 2002 15:52:38 GMT Organization: Why? Lines: 263 Message-ID: <aq8p86$ev4$2@usenet01.srv.cis.pitt.edu> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$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> <3DC7E6B9.8DCBAF0F@bellatlantic.net> NNTP-Posting-Host: electronic2.cbp.pitt.edu X-Trace: usenet01.srv.cis.pitt.edu 1036511302 15332 136.142.52.106 (5 Nov 2002 15:48:22 GMT) X-Complaints-To: usenet@imap.pitt.edu NNTP-Posting-Date: Tue, 5 Nov 2002 15:48:22 +0000 (UTC) X-Newsreader: News Xpress 2.01