Re: [time-nuts] Man killed in quartz crystal accident

2013-11-25 Thread Peter Gottlieb
I oncecancelled my purchase of a home when I found a sign nearby indicating an underground high pressure gas transmission line. These days they're probably removing the signs. Let's hope the government doesn't decide that precise timekeeping is of strategic value and not permitted amongst ordi

Re: [time-nuts] Man killed in quartz crystal accident

2013-11-25 Thread Joe Leikhim
If you really want to lose sleep, think about those old rusty 24 inch gas mains running under your neighborhood like in San Bruno California. The warning signs were present there as well. Now thanks to Homeland Security you can't find accurate gas transmission maps on-line unless you are clear

Re: [time-nuts] DMTD: Mixer DC offset will result in time offset at zero-crossing detector out?

2013-11-25 Thread Stephan Sandenbergh
> > > 1st section is common mode low pass filter, 2nd section is differential > common mode low pass filter. Ok - makes sense now. Yes AC coupling after limiting isnt such a good idea. > AC coupling either between the mixer and the input stage of the limiter > chain or after the last linear sta

Re: [time-nuts] Man killed in quartz crystal accident

2013-11-25 Thread Don Lewis
Believe it or not, hydraulic (hydro) water testing is in itself, proven to weaken the vessel structure. Over-pressurization will surely weed out the bad units, but can also have a cumulative (bad) effect of stressing the metal. -Don -Original Message- From: time-nuts-boun...@febo.com