The Lahrs wrote: > > > For a preliminary look at this turn-key system, see: > http://lahr.org/john-jan/psn/as1/as1.html > > Cheers, > John > John C. Lahr > 1925 Foothills Road > Golden, CO 80402 > (303) 215-9913 > john@........ > http://lahr.org/john-jan/science.html Question,,,, I checked the AS1 site above and was interested in the filter that extends the response of the 1.5 natural period to 20 sec,,,,,, How would it be configured to do that???? I spent a couple of hours trying to find the answer in the PSN archives and found a separate add on but didn't notice any add on on the simple diagram or photos of the AS1. For the moment I'm using an STM-8 without the feedback,,,, simple coil and magnet and oil damping,,, it has a natural period of about 4 to 5 seconds. It would be interesting to see if I can extend the response to 20 or 30 seconds with a filter,, until I get the force feedback built. Is the coil in an active filter loop,,,, etc?? Can someone point me to a schematic, a link, an archive,,, etc for the way it could be configured and how would you determine the part values for a given period?? Thanks in advance Stephen Mortensen PSN Station #55 near Pilot Hill Ca 38.828N 120.978W __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>