On Friday 21 April 2017 04:53:14 Erik Christiansen wrote: > On 20.04.17 14:51, Gene Heskett wrote: > > The led makers have now had 40+ years to design such a package, and > > I fail to understand why it has not happened. > > Somewhere near the bottom of my junkbox is an envelope with a pair of > Siemens opto-link (real product name long forgotten) devices, which > came out around 35 years ago. They're small grey rectangles with > through-hole pins, and a fibre entry with ring-nut (like on a collet > holder) on one end. Dunno if they're still marketed, though. > > At Digi-key, this Broadcom offering looks just like one end: > > https://www.digikey.com/product-detail/en/broadcom-limited/SP000063858 >/516-2872-ND/2220931 > Neat. North of $12? No way Jose'. What I am looking at is $2.35 a copy for the transmitter, and the receiver is $2.00/copy. What seems to be missing is the interconnection fiber. Dennis is still looking for that.
> But that would leave the rest of my coil of shielded twisted-pair (for > RS485) cable gathering dust. With 7v of permissible common-mode, and > differential transmission for noise immunity, what more is really > needed? RS485 transceivers are around $2 to $3 IIRC. (I saw some for > 25c today, but they were surplus stock of a now obsolete device.) > > Erik > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
