Sent: Saturday, January 28, 2006 3:14 PM
Subject: Re: Fault zones in Iceland
> Hi Everyone,
>=20
> Chris wrote:
>> The low pass filter on your amplifier board should be 10 Hz and have =
8=20
>> poles. In practice, a signal at 13.4 Hz will be reduced to 1/10 and =
one at 18=20
>> Hz to 1/100.
>> The amplifier has a high pass filter set at 0.05 Hz =3D 20 sec., =
which is=20
>> well below the lowest response of your geophones.
>=20
> Actually Jon's Amp/Filter board has a 20 Hz 7 pole low pass filter. I =
usually set the=20
> filter to 20 Hz instead of the 10 Hz if I know that the filter board =
will be used=20
> with a geophone to record local events.
>=20
> Regards,
> Larry Cochrane
> Redwood City, PSN
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
Good Morning from NZ (2-53am)
Can you send my a circut =
diagram and=20
a Pic of the Amplifer please I've thought of a way of making=20
pickup
1/ A plastic Jam =
jar with a=20
screw lid full of jelly or grease or fat or sand or even sugar with the =
screw=20
lid screwed down tight
2/ take an old computer =
case with the=20
speaker still mount =
in=20
it
3/=20
Run a couple =
of long=20
wires from the speaker in inside comuputer case outside the cas (I =
have=20
about 5 or 6 of them)
4/ Put he comuter case =
inside a trash=20
bag with the wires from the speaker outside the trash bag and then seal =
it with=20
packing tape
5/ dig a hole in the =
ground about a=20
metre deep and bury the computer case
6/ The=20
speaker would act as Microphone =
to your=20
ampilfier (perampifier)
7/ Run the wires to the microphone jack on my computer =
or a=20
laptop use a software music mixer/editor prg with shows the =
music as=20
waves
8/ Then PRINT IT =
or export=20
inputed data to a file compatable with a prg that would show the wave =
and PRINT=20
IT
What do you think of my =
idea as I'm a=20
Member of:-
"THE NUMBER 8 WIRE KIWI =
CLUB"=20
(Inventor)
Cheers Tamati
From the =
Castle of=20
Tamati, Hinemoa and Karauwa the Dog
From the Castle of Tom, Robyn and =
the=20
Dog
I'm Just a Stone's Throw Away:- =
NZ-021-150-33-59=20
or=20
NZ-07-855-0195
&=
nbsp; &n=
bsp; =20
Bush Telegragh:- chief.cook.nz@............
=
=20
&=
nbsp; =20
My Regular Pitstop:- Tamati
&nbs=
p; =
; =20
P.O.BOX 19-356=20
CENTRAL
&n=
bsp; &nb=
sp; &nbs=
p; =
; =
=20
HAMILTON
&=
nbsp; &n=
bsp; &nb=
sp; &nbs=
p; =
; =20
NEW ZEALAND
----- Original Message ----- =
From: "Larry Cochrane" =
<lcochrane@..............>
To: <psn-l@..............>
Sent: Saturday, January 28, 2006 3:14=20
PM
Subject: Re: Fault zones in=20
Iceland
> Hi Everyone,
>
> Chris =
wrote:
>> The low=20
pass filter on your amplifier board should be 10 Hz and have 8=20
>> poles. In practice, a signal at 13.4 Hz will be reduced =
to =20
1/10 and one at 18
>> Hz to =
1/100.
>> =20
The amplifier has a high pass filter set at 0.05 Hz =3D 20 sec., =
which is=20
>> well below the lowest response of your geophones.
> =
>=20
Actually Jon's Amp/Filter board has a 20 Hz 7 pole low pass filter. I =
usually=20
set the
> filter to 20 Hz instead of the 10 Hz if I know that the =
filter=20
board will be used
> with a geophone to record local =
events.
>=20
> Regards,
> Larry Cochrane
> Redwood City, =
PSN
>=20
> =
__________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>
> To =
leave=20
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.