On Saturday, June 16, 2012 12:17:16 PM John Kasunich did opine: > On Fri, Jun 15, 2012, at 11:40 PM, gene heskett wrote: > > On Friday, June 15, 2012 11:10:42 PM Jon Elson did opine: > > > gene heskett wrote: > > Your idea of triple chipping the driver is an excellent one, but > > needs a storage capacitor directly across the chip(s) supply pins, > > 2" of pcb trace away won't cut it. Its got to be right there on > > those 2 pins, and a capacitor per chip is probably a very good > > idea. Electrolytics aren't a great idea either because of ESR > > buildup over time, but I saw some 50 volt, 2 u-f dipped mylar > > caps not too long ago that might be just what the doctor > > ordered. > > These days you can get 4.7uF or even 10uF ceramic caps with > ultra-low inductance and ESR in a 1206 surface mount package. > Mount it right next to (or on the bottom of the board, directly > under) the driver chip. Total lead length from driver to cap > and back can be a couple tenths of an inch, or less.
I wasn't aware of that John, too long out of the ditches & moats we build to see if we can contain the damage to equipment that the average fresh news reporter can do. 10 years the end of this month. Time flies when you are having fun on your own budget. I went to the basement/freezer to get breakfast and found my water heater had sprung a leak. Those are like beer, you don't buy them, you rent them. So guess what I'll be doing the rest of the day... And yes, I can pass the plumbers test, all my hot faucets are on the left, and excrement tries to run downhill, but payday except for SS, stopped 10 years ago. :) 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> Reformed, n.: A synagogue that closes for the Jewish holidays. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
