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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!

  • Magazines: 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.

  • AudioXpress: 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.  AudioXpress

  • 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.  The Audiophile Voice

  • 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. 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 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!  Check out ED's web
    site, at:  Electronic Design Web Site

  • EDN: 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!  Check out EDN's web site, at:  EDN
    Web Site  See also Analog Editor: Paul Rako's 'Anablog'

  • Greg Szerkeres's Site: Greg has assembled a site with a host of links of interest to audio
    folks. Recommended as a source of useful information. See: Greg Szekeres Web Site

  • 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. See: Jan's Web 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.  Ken's Web Site

  • 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. Joe Sousa's GAP/R Archive

  • Regulator Hardware: I am often asked about where to obtain printed circuit boards (PCBs)
    and other electronic parts useful for building audio regulators. The answer to this is simple:
    there are only a couple that can be recommended, they are listed below.

    For general purpose components, I recommend distributors such as Digi-Key and
    Mouser, which offer truly excellent service.

    For printed circuit boards to support the  "Improved Regulators", one possibility is  the
    Old Colony / Jan Didden PCB set, available at Old Colony PCBs. The "Improved
    Regs" article details how this 1995 PCB design can be modified to support the later
    updates. It does work OK, but there is a better solution, just below.

    Andy Weekes has published his own take on these regulator concepts, and offers a
    fine PCB design which supports both the "Improved regs" as well as the 1997 EDN
    variation, and it does support a pre-regulator stage. This PCB design is the best
    attainable right now, IMO, and is recommended. See Andy Weeke's Regulator page
    Andy has designated Patrick Dixon to supply his PCB design to those interested.

    Definitely un-recommended for PCB designs are some other copycat web posters /
    audio regulator "designers" who may claim to be offering a "Super Regulator", or may
    even throw in my name in passing. Be informed that, on the use of my name, they
    have no authority to do so. One such person even agreed in writing to me to desist in
    associating my name with his "product", then proceeded to continue doing so
    anyway! Folks, use only the best sources for these projects. If you are still confused
    about who is/isn't recommended, drop me an email.

  • Patent Research Links:
  • These links will very likely be useful when researching US and worldwide patents. Note: They are listed here in general 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 this example: Google Patents  Thanks to Paul Rako, EDN analog editor, for this tip.

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

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

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

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

Links of Interest