If you don't ground the can then the stability and repeatability of the crystal frequency will not be as good as it can be. With the can ungrounded, if you listen to the crystal signal on a shortwave receiver in CW or SSB modes you can hear it jump around as you touch the can. Properly grounded, you can barely hear any tone pitch change when you touch the can. Sean On Sat, Jan 28, 2017 at 4:33 AM, IVP wrote: > > how much *really* necessary is to ground the Xtal's metal cans? > > I've had one project along time ago in which the micro, a 10MHz > 16F84, was quite affected by the crystal can not being grounded > > Since then I routinely ground the can so don't how many other weird > things have been prevented. Can't say I've ever damaged a crystal > in any of the common cans with a quick solder to a grounding wire > or pad > > Joe > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2016.0.7998 / Virus Database: 4749/13851 - Release Date: 01/27/1= 7 > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .