PSN-L Email List Message

Subject: RE: Speaker Like Sensor ?
From: "Gary Lindgren" gel@.................
Date: Wed, 10 Mar 2010 10:22:52 -0800


Geoff,
I also recommend Chris' design, it is very good and easy to build. All =
you
need is a drill press. The rare earth magnets are readily available and =
low
cost. See http://www.kjmagnetics.com/neomaginfo.asp . Forget the speaker
concept. It would be difficult to support the coil in the very narrow =
space
between the coil and magnet air gap without the coil touching the =
magnet's
edges.
Gary





Gary Lindgren
585 Lincoln Ave
Palo Alto CA 94301
=A0
650-326-0655
=A0
www.blue-eagle-technologies.com=A0=A0 Check out Lastest Seismometer =
Reading
cymonsplace.blogspot.com=A0
sites.google.com/site/seismicsensorinfo/Home    Design Details for New
Vertical Seismometer=20
=A0




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of Geoffrey
Sent: Tuesday, March 09, 2010 7:46 PM
To: PSN-LIST
Subject: Speaker Like Sensor ?

Hello instrument folks,

Is it possible to get a speaker company to
build the mechanism like a speaker
without a cone that would be like
500 to 10K OHMS or more instead of
the typical 8 ohms ?

I think it may be the best of all sensors
for a velocity type anything geophone ??

Comments ?

It seems to me if you are going to
make the coil a part of the mechanism
you need that special delicate speaker
wire that is braided with cloth=20
so that the springy nature of the wire
will not be there to affect your results?

geoff

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