I am starting to collect materials for a vertical seismo based on the STM-8
design.  I have a rather small (7") speaker that I am considering for using
for the magnet and feedback coil, but I'm wondering if the magnet is strong
enough.  Can anybody give me some insight into how big a magnet is needed or
whether I would have to make adjustments elsewhere in the design to
compensate for a smaller magnet?

Larry Conklin
Liverpool, NY
lconklin@............


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