PSN-L Email List Message

Subject: Re: Seismograph for school
From: Pete Rowe ptrowe@.........
Date: Tue, 26 Sep 2006 21:30:10 -0700 (PDT)

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

--- 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.
>   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
> 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
>               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!
> Amaseis supports this ADC. 
>               See
>               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
>               and
>               and
>               and
>               ALSO
>  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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