Sorry. Yes, a math error. A better estimate of the worst-case might to 20,000 RPM and 1000 pulses per rev. That means 330,000 per second for each channel. But I bet close to 20,000 per second
A simple comparator with hysteresis would work well. You really do need to add hysteresis to deal with noise Here is a good article: http://www.ti.com/lit/ug/tidu020a/tidu020a.pdf Hysteresis is a simple concept. Every heater thermostat has this built into it. The "on-point" is lower than the "off-point" otherwise the heat would cycle to fast. On Fri, Feb 14, 2020 at 8:25 AM andy pugh <bodge...@gmail.com> wrote: > On Fri, 14 Feb 2020 at 16:16, Chris Albertson <albertson.ch...@gmail.com> > wrote: > > > > > If there are even 100 pulses per revolution and the spindle runs at 100K > > RPM then we are talking about 10000K or 10 MHz. > > > > 100,000 rpm is _very_ fast for a spindle. And even then you missed the 60 > in rpm / Hz conversion. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is designed > for the especial use of mechanical geniuses, daredevils and lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
