Question,,,   I understand that the 1 sec AS-1 vertical uses an 
amp-filter which compensates for the signal rolloff so that it works out 
to about 25 or 30 sec.,,,,   is the schematic for it, or a similar 
amp-filter available anywhere????   I'd like to adapt it to use with my 
4.5 sec vertical!!   I can do it after the fact, using Bob McClures 
excellent software, but would like to fix the signal before the A/D 
converter,  to save a few steps!!   Interesting that they give details 
on building the AS-1 sensor, but not the electronic,,  that I can find??
   Thanks in advance,
     Stephen Mortensen
     PSN Station #55
     near Pilot Hill Ca.  USA
     38.828N  120.979W

John or Jan Lahr wrote:

> I've posted some pictures of a 1 Hz vertical seismometer that leaves a 
> lot to be desired but is relatively quick and easy to build: 
> http://jclahr.com/science/psn/wooden/ .  If it does a reasonable job of 
> recording earthquakes I'll post added details.
> 
> Cheers,
> John
>
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