PSN-L Message - Subject: Re: AS-1 Type Sensor

AMEN on Chris! Excellent & Beautiful drawing. Do you have photos of = finished instrument? Jerry Payton From: Kay Wyatt=20 Sent: Sunday, January 23, 2011 4:06 PM To: psnlist@................. Subject: Re: AS-1 Type Sensor Bob, I have a little more update to date information on the AS-1. You are = correct that Jeff Batten passed away. His wife has been able to engage = a friend who is an electrical/mechanical engineer into taking on Jeff's = work. There is quite a bit of backlog in providing AS-1 seismometers to = the IRIS Seismographs in Schools project http://www.iris.edu/hq/sis so = he will be concentrating on that first. However, I am told by IRIS that = he is planning on making improvements to Jeff's design and will be = working on that as soon as he can catch up. Chris Chapman has provided me with one of his period extending circuit = designs which I am testing. Chris has been an invaluable resource to = me. I am so glad that he is back online. What a resource he is! Kay Wyatt ----- Original Message -----=20 From: Bob McClure=20 To: psnlist@................. Sent: Sunday, January 23, 2011 1:18 PM Subject: Re: AS-1 Type Sensor It seems for now that anyone who wants an AS-1 sensor will have to = build their own. Chris Chapman informed me that GeoffBatten = unfortunately died a couple of months back and his widow does not seem = to have found anyone to make more AS-1's. I do not know how hard it will = be to obtain the BlackBox amplifier that is a vital part of the AS-1 = system. Chris may be eventually able to supply us with a circuit diagram = of an amplifier providing the necessary bass boost, but he is = recuperating at his home in the Midlands, and presently unable to access = his papers in his primary residence in Upwaltham. Meanwhile, my digital = inverse filter, implemented in WQFilter.exe, can be helpful. Larry is = working on coding this filter for use in WinQuake. I want to remind all that the connections between the spring ends and = the sensor are also flexure points, and deserve every bit as much = attention to slip-stick friction and flat spots as the boom attachment. = I have learned this from hard experience. Bob On Sun, Jan 23, 2011 at 2:54 PM, Richard Schneider = wrote: Hello PSN, I would appreciate any comments regarding my AS-1 type sensor. It's = close to the original design. I did not like the knife edge aluminum = boom attached to a score mark in the aluminum mast, so I modified the = boom to mast attachment. I am using two razor blades. One on the boom = and one on the mast. Hardened steel on steel. Friction is much less. = Free running oscillations have a much longer duration. Does anyone have = a better suggestion? I would like to hear from you. See my pic's here: http://picasaweb.google.com/cfi2fly/MyPictures# Also, Chris, if you read this, if I reversed the coil and magnet, = would the effort be worth the results? Thank you all, Richard

AMEN on Chris! Excellent & Beautiful drawing. Do = you have=20 photos of finished instrument?

Jerry Payton

From: Kay Wyatt

Sent: Sunday, January 23, 2011 4:06 PM

To: psnlist@..............

Subject: Re: AS-1 Type Sensor

Bob,

I have a little more update to date information = on the=20 AS-1. You are correct that Jeff Batten passed away. His wife = has=20 been able to engage a friend who is an electrical/mechanical engineer = into=20 taking on Jeff's work. There is quite a bit of backlog in = providing AS-1=20 seismometers to the IRIS Seismographs in Schools project http://www.iris.edu/hq/sis so he = will be=20 concentrating on that first. However, I am told by IRIS that he is = planning on making improvements to Jeff's design and will be working on = that as=20 soon as he can catch up.

Chris Chapman has provided me with one of his = period=20 extending circuit designs which I am testing. Chris has been an = invaluable=20 resource to me. I am so glad that he is back online. What a = resource=20 he is!

Kay Wyatt

----- Original Message -----

From:=20 Bob=20 McClure

To: psnlist@.............. =

Sent: Sunday, January 23, 2011 = 1:18=20 PM

Subject: Re: AS-1 Type = Sensor

It seems for now that anyone = who wants=20 an AS-1 sensor will have to build their own. Chris Chapman informed me = that=20 GeoffBatten unfortunately died a couple of months back and his widow = does not=20 seem to have found anyone to make more AS-1's. I = do not=20 know how hard it will be to obtain the BlackBox amplifier that is a = vital part=20 of the AS-1 system. Chris may be eventually able to supply us with a = circuit=20 diagram of an amplifier providing the necessary bass boost, but he is=20 recuperating at his home in the Midlands, and presently unable to = access his=20 papers in his primary residence in Upwaltham. Meanwhile, my digital = inverse=20 filter, implemented in WQFilter.exe, can be helpful. Larry is working = on=20 coding this filter for use in WinQuake.

I want to remind all = that the=20 connections between the spring ends and the sensor are also flexure = points,=20 and deserve every bit as much attention to slip-stick friction and = flat spots=20 as the boom attachment. I have learned this from hard=20 experience.

Bob

On Sun, Jan 23, 2011 at 2:54 PM, Richard = Schneider=20 <cfi2fly@.........> = wrote:

Hello PSN,

I would appreciate any comments regarding my AS-1 type sensor. = It's=20 close to the original design. I did not like the knife edge aluminum = boom=20 attached to a score mark in the aluminum mast, so I modified the = boom to=20 mast attachment. I am using two razor blades. One on the boom and = one on the=20 mast. Hardened steel on steel. Friction is much less. Free running=20 oscillations have a much longer duration. Does anyone have a better=20 suggestion? I would like to hear from you.

See my pic's here: http://picasaweb.google.com/cfi2fly/MyPictures#

Also, Chris, if you read this, if I reversed the coil and = magnet, would=20 the effort be worth the results?

Thank you all,

Richard

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