Hi Pete, Ted, Chris, others-- I'll defer to Pete Rowe as he is the circuit
designer of the original PSN amp that I use in my system with Larry's serial
data collection board and WINSDR and as he can send you the PDF of his
original handout I'll defer to him. BTW, this is the drawing that served as
the source for the machine drawings on my site. Pete, if you would, please
send a copy of the PDF to me at the adders below. I'll add it to my PSN San
Jose site. Thanks--

I also received a couple of notes from Chris Chapman (thanks Chris) that
have some details that I was not aware of and you may not have seen. So,
here is that text. " There is now a network of school sites all over the USA
on SpiNet and on some sites outside. There are two in the UK and this is
expected to increase very significantly in the next couple of years. See
www.scieds.com/spinet for details. They all use a free recording program
called Amaseis and AboutTime time clock updates. For details see the Iris
website under 'outreach' or http://jclahr.com/science/psn/as1/index.html.
Amaseis does support Dataq ADCs and their DI-154 12 bit +/-10V model is now
reduced in price to $39 + pp. www.dataq.com This is about the minimum
resolution which is useful for seismic recording. The same resolution is
used on the school AS-1 seismometers, distributed by Iris. "

Chris also shared a link to John Lahr's web page with a sensor picture I had
not seen http://jclahr.com/science/psn/chapman/lehman/index.html and I can
only be described it as "very cool" and I want two...

Regards, Steve Hammond PSN San Jose, Aptos California
shammon1@.............

-----Original Message-----
From: psn-l-request@..............
[mailto:psn-l-request@................. Behalf Of Pete Rowe
Sent: Tuesday, September 26, 2006 9:30 PM
To: psn-l@..............
Subject: Re: Seismograph for school


Ted
I'll be glad to send you PDF files of my schematics.
Let me know
Pete Rowe
San Jose, CA
ptrowe@.........

--- tchannel  wrote:

> Hi Stephen,  Thanks for this recommended site...I
> could not enlarge the PSN Preamp and PSN filter Amp
> by Pete Rowe, to see the values on the drawings.  I
> searched the net but could not find any other site
> for them.  Do you know where I might be abe to find
> these, large enough to print?  Thanks, Ted
>   ----- Original Message -----
>   From: Stephen Hammond
>   To: psn-l@..............
>   Sent: Tuesday, September 26, 2006 11:38 AM
>   Subject: RE: Seismograph for school
>
>
>   Hi, I would like to add a few thoughts. There are
> some simple plans on the PSN San Jose website.
> http://pw2.netcom.com/~shammon1/equip.htm#Plans
>   however, I strongly suggest that you look at
> Larry's WINSDR software / equipment because in the
> classroom, the software environment is one of the
> most important attributes you need to consider. The
> stability of the system hardware and software and
> the quality of the information provided
> significantly improves the students interaction and
> learning outcome from using the system. For example,
> if you look at the PSN San Jose main page
> http://www.PublicSeismicNetwork.com you will find
> two links at the bottom left of the page to South
> Valley Middle School and Los Altos High School. Both
> schools are using WINSDR and Larry's hardware.
> Initially when we built the system at Los Altos we
> provided a PC, sensors and simple amp. At South
> Valley, Jan Froom went though several steps getting
> to the current system configuration you see today.
> With the evolution of the Internet, there is a real
> need to incorporate the seismic data into the
> classroom websites. This simplifies the teachers
> interaction with the system and helps to generate
> significant student/parent interest in the project.
> As you can see from the examples, by using the
> automatic upload feature of Larry's WINSDR, the
> sensor data is uploaded continuously during the 24
> hour period. Another benefit is the amount of
> interest the system generates outside of the
> classroom. Look back at the Los Alto page and you
> will see there have been over 24,000 trips to Greg
> Stoehr's seismic science page at Los Altos High in
> the last two years. Considering that he has about
> 300 students per semester, this provides a 40-trip /
> student page access ratio which is a significant
> amount of return on investment. Greg keeps the
> system in his classroom and his students take part
> in operating the system during the class year. Greg
> is extremely limited on the amount of time he can
> spend on the system and WINSDR has significantly
> improved his productivity. With a minimal
> investment, you will see a vast improvement over a
> simple classroom sensor and amp.
>   Regards, Steve Hammond  PSN San Jose, Aptos
> California
>
>     -----Original Message-----
>     From: psn-l-request@..............
> [mailto:psn-l-request@................. Behalf Of
> tchannel
>     Sent: Tuesday, September 26, 2006 7:38 AM
>     To: psn-l@..............
>     Subject: Re: Seismograph for school
>
>
>     Hi John,  Ted here, and I am one month into a
> similar project, using my own money, for a non
> profit organization.
>     We are having a lot of fun on the project, but
> the electronics are challenging, even though I have
> worked on circuits, I thought I was up to it
> electronic task, but now I am not sure.   I have
> made some progress however, so I think I am getting
> closer.
>     I am happy to share my successes and failures if
> you would like to correspond.  Ted
>       ----- Original Message -----
>       From: John Patskan
>       To: psn-l@..............
>       Sent: Monday, September 25, 2006 11:11 PM
>       Subject: Re: Seismograph for school
>
>
>       Hello everyone,
>
>       Thanks for the tips.
>
>       I believe I will try to build the Lehaman
> style unit.
>
>       This is actually an elementary school.  It
> used to be an Environmental Science magnet school,
> and they still have room they call the Eco-Lab.
> Each class goes in there once a week and the
> teachers have them work on some project.  This year
> the teachers decided on a Geology theme.  I thought
> a seismograph would be nice to have in the lab.
> Actually I think the homemade one would be better
> because the kids could get a better idea of how it
> works.  They wouldn't be doing anything in depth but
> I thought seeing there own siesmograph records may
> spark some interest in science.  I Haven't
> approached the teachers yet as I want to make sure I
> can pull it off first.
>
>       John P
>
>
>       On 9/23/06, tchannel 
> wrote:
>         Hi Chris,  What sort of "choice of
> suspension system" would you recommend? Is there a
> detail I can look at?
>         I have only seen the knife edge style.
>         Thanks, Ted
>           ----- Original Message -----
>           From: ChrisAtUpw@.......
>           To: psn-l@..............
>           Sent: Saturday, September 23, 2006 5:09 PM
>           Subject: Re: Seismograph for school
>
>
>           In a message dated 23/09/2006,
> jcpatskan@......... writes:
>             I am thinking of trying to build a
> seismograph for my son's school. I have quite a bit
> of experience in shallow exploration geophysic's,
> mostly electrical and electromagnetic, but none in
> seismology.  I have searched the internet and found
> quite a few resources.
>           Hi John,
>
>               You might consider making a medium
> sized Lehman - about 2 ft long? Say about 1.5 sec
> period that can be extended to 20 sec?
>
>               You will need +/-12V stabilised power
> supplies of you may buy an amplifier and transformer
> from Larry at http://psn.quake.net
>
>               Since it will be used with other
> school systems, I suggest that you use Amaseis and
> buy a DI-154 12 bit ADC still at just $39!
> www.dataq.com Amaseis supports this ADC.
>               See
> http://jclahr.com/science/psn/as1/index.html
>
>               Use magnetic damping, NOT oil.
>
>               Use an all metal braced single unit
> costruction - NO plastic structural components - NO
> separated sections.
>
>               Your choice of suspension system is
> critical. NEITHER a point on a plane NOR knife edge
> systems are satisfactory - avoid them like the
> plague. Most other systems are OK to good. You need
> to be able to get a period of at least 20 seconds.
>
>               Have a look at
>
http://jclahr.com/science/psn/chapman/lehman/index.html
>
>               and
> http://jclahr.com/science/psn/chapman/index.html
>               and
> http://www.jclahr.com/science/psn/cor_psn.html
>               and http://jclahr.com/science/psn/
>
>               ALSO
>
http://www.mgm.monschau.de/seismic/english/artikel/artikel_1_4.php
>  and sequels
>
>               I have also noticed a seismograph (or
> strong motion accelerometer) on sale at e-bay, with
> an opening bid of $75.
>               I suggest that you forget this one!
> You do not need a strong motion sensor - or the
> headaches of converting an optical one. This might
> be called 'buying trouble'!
>
>               Good Luck!
>
>               Chris Chapman
>
>
>


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