High,
I hope that this is the right list for my question.
teaching in a highschool in Istanbul I had after the events from the
last months the idea, to build a seismograph with some students.
we studied the pages from Lary Cochrane from the Redwood City Seismic
Network, were we found some very good ideas and information.
My question: We found a lehman-Pendulum suitable for us. But as we have
hardly any tools we must search for ways to simplify everything. Is it
reasonable, to use mediumsize loudspeakers as sensors, where we want to
cut off only the black membrane but leave the coil attached to the
magnet by the brown  folded tissue-membran in order to keep it well
adjusted. Then we want to fix two of those speakers to the ground at the
left and the right of the end of the boom, so that a plastikstick glued
perpendicular at the end of the boom is squeezed between the two
speakers and induces a current in both of the coils when it moves to the
left and the right.. For those of you who have experience: do you think,
that this might work or is there no way to be sensitiv enough. And if
so, how should the amplifier and filter  look like for the two coils?

Thanks for any help

ruediger wisskirchen
rwisskirchen@.......



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