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From: Wayne on 22 Nov 2009 22:35
I am looking for the seminal paper by Sallen and Key entitled, "A
Practical Method of Designing RC Active Filters." I am currently
compiling a list of resources for an application report I am writing
for filter topologies and many resources that I found (application
notes, journals, books) all reference this document as a source for
the Sallen-Key topology. The problem is I cannot find this paper
*anywhere*. I even looked thru the IEEE Xplore Digital Library.
Wouldn't you know it, volume 2 issue 1 from 1955 is not in the
database:

Sallen, R. P.; E. L. Key (1955-03). "A Practical Method of Designing
RC Active Filters". IRE Transactions on Circuit Theory 2 (1): 74–85.

This has gone beyond the need for my report as I can use other
sources, but this has turned into a quest to actually find the paper
for the sake of simply having a piece of history that apparently is
lost at the moment. I am a stickler for old (50+ years) engineering
books and articles.

Any greybeards out there that may have a dusty old cabinet in a dimly
lit room that has not been searched in a while?

From: Tim Wescott on 22 Nov 2009 23:56
On Sun, 22 Nov 2009 19:35:59 -0800, Wayne wrote:

> I am looking for the seminal paper by Sallen and Key entitled, "A
> Practical Method of Designing RC Active Filters." I am currently
> compiling a list of resources for an application report I am writing for
> filter topologies and many resources that I found (application notes,
> journals, books) all reference this document as a source for the
> Sallen-Key topology. The problem is I cannot find this paper
> *anywhere*. I even looked thru the IEEE Xplore Digital Library.
> Wouldn't you know it, volume 2 issue 1 from 1955 is not in the database:
>
> Sallen, R. P.; E. L. Key (1955-03). "A Practical Method of Designing RC
> Active Filters". IRE Transactions on Circuit Theory 2 (1): 74–85.
>
> This has gone beyond the need for my report as I can use other sources,
> but this has turned into a quest to actually find the paper for the sake
> of simply having a piece of history that apparently is lost at the
> moment. I am a stickler for old (50+ years) engineering books and
> articles.
>
> Any greybeards out there that may have a dusty old cabinet in a dimly
> lit room that has not been searched in a while?

Are you close to any engineering schools? Way down in the basement of
Worcester Polytechnic Institute's library there were technical
publications going back to the late 1800's.

--
www.wescottdesign.com
From: Jon Kirwan on 23 Nov 2009 03:25
On Sun, 22 Nov 2009 19:35:59 -0800 (PST), Wayne
<wayne.little(a)gmail.com> wrote:

>I am looking for the seminal paper by Sallen and Key entitled, "A
>Practical Method of Designing RC Active Filters." I am currently
>compiling a list of resources for an application report I am writing
>for filter topologies and many resources that I found (application
>notes, journals, books) all reference this document as a source for
>the Sallen-Key topology. The problem is I cannot find this paper
>*anywhere*. I even looked thru the IEEE Xplore Digital Library.
>Wouldn't you know it, volume 2 issue 1 from 1955 is not in the
>database:
>
>Sallen, R. P.; E. L. Key (1955-03). "A Practical Method of Designing
>RC Active Filters". IRE Transactions on Circuit Theory 2 (1): 74�85.
>
>This has gone beyond the need for my report as I can use other
>sources, but this has turned into a quest to actually find the paper
>for the sake of simply having a piece of history that apparently is
>lost at the moment. I am a stickler for old (50+ years) engineering
>books and articles.
>
>Any greybeards out there that may have a dusty old cabinet in a dimly
>lit room that has not been searched in a while?

It bothers me to find that paper cited often. If it is hard to find
(as in, 'not readily available'), then I suspect that many are citing
it without having actually read it. Almost dishonest.

Jon
From: Michael Black on 23 Nov 2009 11:19
On Mon, 23 Nov 2009, Jon Kirwan wrote:

> On Sun, 22 Nov 2009 19:35:59 -0800 (PST), Wayne
> <wayne.little(a)gmail.com> wrote:
>
>> I am looking for the seminal paper by Sallen and Key entitled, "A
>> Practical Method of Designing RC Active Filters." I am currently
>> compiling a list of resources for an application report I am writing
>> for filter topologies and many resources that I found (application
>> notes, journals, books) all reference this document as a source for
>> the Sallen-Key topology. The problem is I cannot find this paper
>> *anywhere*. I even looked thru the IEEE Xplore Digital Library.
>> Wouldn't you know it, volume 2 issue 1 from 1955 is not in the
>> database:
>>
>> Sallen, R. P.; E. L. Key (1955-03). "A Practical Method of Designing
>> RC Active Filters". IRE Transactions on Circuit Theory 2 (1): 74–85.
>>
>> This has gone beyond the need for my report as I can use other
>> sources, but this has turned into a quest to actually find the paper
>> for the sake of simply having a piece of history that apparently is
>> lost at the moment. I am a stickler for old (50+ years) engineering
>> books and articles.
>>
>> Any greybeards out there that may have a dusty old cabinet in a dimly
>> lit room that has not been searched in a while?
>
> It bothers me to find that paper cited often. If it is hard to find
> (as in, 'not readily available'), then I suspect that many are citing
> it without having actually read it. Almost dishonest.
>
> Jon
>
Yes and no. Yes, because they are basing what they are writing on second
hand sources.

But no, because too often the origins get lost, so nobody bothers to look
for them.

One classic case is the superregenerative receiver. Patented in 1922, the
more it faded from view the less description it got, until there was a
schematic and very vague description, so most people would only treat it
like a mysterious black box. Then about a decade ago, Charles Kitchin
went back and looked at the patent and original articles, wrote about the
originals rather than the descendants far removed, and then with full
understanding did work to improve the concept.

You can't do that if there are no pointers to the original material.

In the case of active filters, others have problem better synthesized the
material, yet it's still important to point back to that first source.

Michael
From: Wayne on 23 Nov 2009 15:23
On Nov 22, 9:56 pm, Tim Wescott <t...(a)seemywebsite.com> wrote:
>
> Are you close to any engineering schools?  Way down in the basement of
> Worcester Polytechnic Institute's library there were technical
> publications going back to the late 1800's.
>
> --www.wescottdesign.com


I may have to go to my local university, but I did receive two replies
from the email I sent to the IEEE Xplore support link:

First reply:
Thank you for your email. Unfortunately we do not have the legacy
content for this particulal issue.
"IRE Transactions on Circuit Theory " 1955, Issue # 1, Vol # 2. It
is therefore not available to view from
our IEEE Xplore site. You may as a suggestion try contacting the
History Center at Rutgers.

Second reply:
Thanks you for your email. I just sent a email to the History Center
over at Rutgers. The History Center does not have the old
professional group transactions, only the IRE Proceedings. However,
it is likely that you may contacts Linda Hall Library in Missouri, he
may be able to obtain. Linda Hall is the repository library for
engineering, and it has a document delivery service.

So I will contact Linda Hall and see what secrets they have.
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