TO: ALL
MAXIM has a 5 pole Bessel analog filter (Part # 7409)  which is an 8 pin dip 
package which operates with 5 volts.  Since they only require several 
additional components (resistor and two capacitors) to operate, they would 
appear to be useful for a seismograph.  Has anyone had any experience with 
these filters?  MAXIM's Web address: http://www.maxim-ic.com should you like 
to check it out.
Jim Allen
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