I agree with Gary. I used STM' s design for the vertical with a 8" Radio Sh=
ack woofer speaker. I opened up the gap in the magnet to provide more space=
 and spent an awful lot of time with duck tape removing all the loose piece=
s.=20

Regards
Barry
http://www.seismicvault.com

--- On Wed, 3/10/10, Gary Lindgren  wrote:

From: Gary Lindgren 
Subject: RE: Speaker Like Sensor ?
To: psn-l@..............
Date: Wednesday, March 10, 2010, 10:22 AM

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=A0 =A0 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

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)



__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

I agree with Gary. I used STM' s design for t=
he vertical with a 8" Radio Shack woofer speaker. I opened up the gap in th=
e magnet to provide more space and spent an awful lot of time with duck tap=
e removing all the loose pieces. 

Regards
Barry
http://www.seismicva=
ult.com

--- On Wed, 3/10/10, Gary Lindgren <gel@thec=
onnection.com> wrote:

From: Gary=
 Lindgren <gel@.................>
Subject: RE: Speaker Like Sensor=
 ?
To: psn-l@..............
Date: Wednesday, March 10, 2010, 10:22 AM=


Geoff,
I also recommend Chris' design, =
it is very good and easy to build. All you
need is a drill press. The ra=
re 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
&nb=
sp;
650-326-0655
 
www.blue-eagle-technologies.com  =
; Check out Lastest Seismometer Reading
cymonsplace.blogspot.com sites.google.com/site/seismicsensorinfo/Home    Design Details =
for New
Vertical Seismometer 
 




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

Hello instru=
ment 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 t=
he best of all sensors
for a velocity type anything geophone ??

C=
omments ?

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 
so that the springy nature of the wire
will not =
be there to affect your results?

geoff

______________________=
____________________________________

Public Seismic Network Mailing =
List (PSN-L)

To leave this list email PSN-L-REQUEST@.............. with 
the =
body of the message (first line only): unsubscribe
See http://www.seismicnet.=
com/maillist.html for more information.


____________________=
______________________________________

Public Seismic Network Mailin=
g List (PSN-L)

To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first =
line only): unsubscribe
See http://www.seismicnet.com/maillist.html for m=

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