Barry, The magazine "Motion Control" is different from "Motion"; both are industry freebies with lots of advertising and free literature. Regarding the new coil/magnet transducer: I described the coil winding on December 26, and the magnet made from parts bought from McMaster on January 31, which included info on the generator constant of the assembly. Do I need to repeat the postings? I haven't had time to scan the drawings and post photos. With the 100 ohm, 1200 turn coil producing about 10 Newtons/Ampere (Volts/M/sec), the output is about the same as the large speaker magnet, but the coil clearance is such that about +,- 2 mm of movement at a distance of only 10 cm from the flexure point does not result in jamming. This would allow for a leaf-spring vertical of half the size of the original. The new magnet is only 1.5" OD, and the coil is 5/8" ID x 3/4" OD and 5/8" long at the inside winding. Let me know if I need to repeat the coil/magnet info. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>