Links of Interest

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The links listed below fall into several categories which overlap this site, but also have another unique characteristic. They all demonstrate remarkable effort and/or quality of content in assembling the material. Highly recommended!


The magazines highlighted below bear a role important to me over the years, having carried articles of mine on audio or more general electronic topics. Some of these articles are archived here, and they have shown very high popularity. It is hoped that you can thank these publishers by visiting their sites and becoming involved.


Since the very early 1970’s, Ed Dell’s audio publications have well served the audio DIY enthusiast. I am pleased to have contributed many articles to The Audio Amateur, Audio Electronics, and the now current AudioXpress. The website for the latter carries information on current issues, archives of older issues, and offers various audio products. One is a unique book service for vintage and current audio-related books. This site is highly recommended to audio fans for the wealth of useful information.

The Audiophile Voice:

Gene Pitts served as editor of Audio magazine for 25 years, thereby soliciting and publishing a wide-ranging scope of articles of audiophile interest. I am pleased to have contributed a few of them, and many of these articles have shown continuing interest here. After leaving Audio, Gene is now publishing The Audiophile Voice, a less specialized magazine devoted to audiophile topics such as music and equipment reviews, and audio industry news. You can order a sample issue from the website, as well as sign up for a subscription. If you enjoy audio, I think you’ll enjoy Gene’s tasteful and informative array of articles — also highly recommended.

Electronic Design:

I published my first article in Electronic Design (or ED as more commonly known) January 4, 1968. This was the beginning of a long and fruitful relationship, with many Ideas for Design and feature articles to follow in ED. With the ‘Walt’s Tools and Tips Column’ (see ED Archives page), I even got to reprise this first Idea for Design on the 30th anniversary, as Anniversary Time. While I was privileged to work with many talented ED editors over the nearly 40 years, my best thoughts are of working closely with the late Bob Milne, on the Tools and Tips column series. My thanks go to Bob (as well as to all the others) for lots of good memories!


I published my first article in EDN magazine December 15, 1969, as IC Lends Stability to Video Limiter. This brief article was the beginning of another long relationship, with many Design Ideas and somewhat fewer feature articles to follow in EDN. While I worked with many EDN editors over the nearly 40 years, my best thoughts go back to the early days, with Walt Patstone as editor. My thanks go to Walt and to all the others for the good memories! See also Analog Editor: Paul Rako’s ‘Anablog’ pages.

Jan Didden’s Site:

Jan Didden, a co-author on the 1995 Audio Amateur regulator series (and also a prolific audio writer in his own right), has a new site.

Electronic Instrumentation and Musical Interests:

Kenneth Kuhn’s site shows off an astounding array of vintage Hewlett-Packard test equipment, and also highlights the musical interests of the author. Ken is a designer specializing in analog electronics, as well as a composer of classical music. This site is true delight for anyone having interest in these areas, and includes many other topical areas as well.

Op Amp History:

Joe Sousa has assembled a historical site dedicated to the works of op amp pioneer George Philbrick and his company, GAP/R. This includes application notes, papers, data sheets, schematics, etc., on the various GAP/R vacuum tube and solid state products. The GAP/R organization set the early standard of quality applications material at lofty heights, a fact which most certainly provided a key stimulus to subsequent growth of op amp technology into what we see today. Lots of good stuff here.

Patent Research Links:

These links will very likely be useful when researching US and worldwide patents. Note: They are listed here in best-to-worst order of utility.

Search patents via Google, with links to subsequent patent references, then save the retrieved file in PDF format. Best patent search tool around, as it has scanned and recorded many patents prior to the US Patent office’s 1976 cut off date. For example, see Karl Swartzel’s seminal vacuum tube op amp patent described in the above example: Thanks to Paul Rako of EDN  for this tip on the Google service.

Search patents via Free Patents Online. Save retrieved document in PDF file format. Requires (free) registration.

Search worldwide patents via the European Patent office. Save retrieved document in PDF file format.

Search US patent office patents by number. Note: Must be used with a TIF file retrieval utility, and then converted into PDF. See Alternatif.

Download a US patent directly in PDF form. Note: Patent number should be known beforehand.

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Walt Jung's 2014 Blog and Info Archive