On Tuesday 13 November 2012 21:54:03 Peter C. Wallace did opine: > On Tue, 13 Nov 2012, Gene Heskett wrote: > > Date: Tue, 13 Nov 2012 19:42:59 -0500 > > From: Gene Heskett <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > <[email protected]> > > > > To: [email protected] > > Subject: Re: [Emc-users] Differential signal from encoders > > > > On Tuesday 13 November 2012 19:17:17 Viesturs Lےےcis did opine: > > > > 2012/11/14 Gene Heskett <[email protected]>: > > > That is a good start. In view of the noise, I think I would add a > > > quad of 1n914 type diodes, such that the noise can't rise too far > > > above the 5volt line, or go too far below ground. Two with the > > > cathode bands toward 5v, the anodes to A & B, and two more from a & > > > B with their anodes connected to ground. It might save you a > > > mysteriously blown chip at some point in the future. > > > > Thanks! > > I should note before you get too wild with input protection that the > 26LS32As are already protected against +-25V inputs and are quite tough. > > > Peter Wallace > Mesa Electronics
I am not intimately familiar with that particular chip but if thats the case, then I'd gopher it. ;-) Some of the earlier stuff is very fragile about those things. Thanks Peter. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! "Life, loathe it or ignore it, you can't like it." -- Marvin, "Hitchhiker's Guide to the Galaxy" ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
