Rick Groleau wrote:
> For anyone who's interested, I've just put together a page of my system, 
> which is centered around a Galitzin-type seismometer that I built in a 
> metals-tech class about 15 years ago. Includes pictures, schematics, and 
> the story of how I built the system...
> 
>  http://users.rcn.com/rgroleau/seismo/index.html
> 
> Judging by the messages I've been reading on this list, my setup is very 
> basic, and there's lots that I have to learn. For example, I still 
> haven't connected it to a computer.

Mechanically, the design looks very nice.  Electronically, it is 
pretty primitive and simple upgrades could improve it significantly.

The coil is unshielded, and the amplifier has no filter function 
included to reject either 60 cycle hum or other mechanical noise that 
isn't part of the seismic signal.  Still it does pretty well with what 
it's got.

Are you interested in changing anything at this point?

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