On Thursday 27 December 2012 18:49:49 Joseph Chiu did opine: > If you're talking about interfacing RS-232 to TTL levels, then any of > the MAX232 style devices will do it -- but generating operating power > from RS232 is genera bad idea. The drivers aren't designed to provide > much current, only several tens of ma's. > The hall device needs 5 to 8 volts abs max, 10 to 13 ma. No clue how much the op-amp draws, its a 5 legged tsop chip about 20 thou thick and about .1" square. If it can draw 10 ma, I'd say its trying to pull down something akin a dead short to vcc.
So I think what I will do is use up the remaining input I originally dedicated to a home switch, a dubious function on a lathe anyway, and which has never been a big enough problem to make me wire it up. Thanks Joseph. 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! Limited delivery area. I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_122712 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
