I just began construction of a Lehman seismometer based on the 1979 Sci =
Am article. It was mentioned somewhere on the PSN website that the =
amplifier design from the original article is inadequate. Can anyone =
suggest where I could find construction details for a better amplifier ? =
thanks

Al Foster
Muncie, IN
Fosterae@........







I just began construction of a Lehman =
seismometer=20
based on the 1979 Sci Am article. It was mentioned somewhere on the PSN =
website=20
that the amplifier design from the original article is inadequate. Can =
anyone=20
suggest where I could find construction details for a better amplifier ? =

thanks
 
Al Foster
Muncie, IN
Fosterae@........