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Another reaction to Stuart Yaniger's article in Vol 0 about the Cathodyne (aka Concertina) phase splitter, this time by frequent contributor Burkhard Vogel from Stuttgart, Germany. Burkhard has…
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The never-ending saga on the cathodyne output impedances: Chris Paul wrote me a letter, commenting on both Burkhard Vogel's LTE and Stuart Yaniger's article in Volume 0. Here is…
Christopher Paul from Bayport, NY, USA commented on Stuart Yanigers article in Vol 0: "Split the Difference: The Truth about the Humble Cathodyne".…
Samuel Groner from Zurich, Switzerland, commented on Ed Simon's article in Vol 1 "Resistor non-linearity - there's more to Ohm than meets the eye". The comments, along with Ed's reply, can be found…
Dr. Ramkumar Ramaswamy wrote a nice article for Linear Audio "A universal Continuous-Time active filter", Vol 1, pp 77. I had an intersting discussion with Ramkumar about the meaning of the "Characteristic…
Another comment to Bruno Putzeys' article in Vol 1 "The F-word - or, why there is no such thing as too much feedback", this time from Marcel van de Gevel. Marcel adds a few pieces to the puzzle on where the 'feedback…
Burkhard Vogel from Stuttgart, Germany commented to Ovidiu Popa's article in Vol 1 "On the Noise performance of Low Noise Input Stages", and to Brad Wood's letter to the same article. Vogel's letter contains a…
Menno van der Veen commented to Bruno Putzeys' article in Vol 1 "The F-word - or, why there is no such thing as too much feedback". In replying to Menno, Bruno en passant comes up with a…
Letter from Walt Jung to Jack Walton on V4 article on power supply measurement and listening tests
Jack's article drew comments from the man who started much of the interest in power supply impact on audio circuits in the 80-ies…
Marcel van de Gevel and Bob Cordell had a lengthy exchange regarding some noise issues in Bob's VinylTrak article in Vol 4. Bob placed a large section of additional material on…
Both Ian Hegglun's article (Towards Reconciliation of Measurements and Listening Tests) and Hans van Maanen's Guest Editorial (The Case for Subjective Listening Tests) in Vol 4 drew comments and some…
Brian Lenharth commented on Les Bordelon's article in Vol 4 on DAC design. His comment was specifically aimed at Les' classification of DACs as R-2R or Sigma-Delta. Between them,…
Linear Audio author Ovidiu Popa wrote an extensive letter, commenting on Hans van Maanen's article On the audibily of "high resolution" digital audio formats and how to test this. Dr. van Maanen replies to each…
Marcel van de Gevel commented on Daniel Joffe's article in Vol 6 "Practical Electronic Control of Class AB Output Stage Quiescent Current". Here are…
Frank Blöhbaum has send me an addendum to his V6 article on Multipled Transconductance Amplifiers.
The addendum addresses some changes…
Marcel van de Gevel send an addendum to his Volume 4 article A tube based phono preamp. In this preamp, neone lamps are used as overvoltage protection elements. The…
In his Volume 8 article on Cube Law power amplifiers Ian Hegglun mentions that he has a lot of additional information available on the subjet. This additional…
In his article on Audio Equalisation in Volume 7, Malcolm Hawksford provided three Appendices. These contain Matlab scripts that can be used to explore the various circuit concepts described in the…
Stuart Yanigers' Linear Audio Volume 2 article with this title has drawn considerable interest from both audio professionals as well as serious amateurs and hobbyists.
Many readers requested to make it available on line,…
Linear Systems has send me the preliminary data sheet for the LSJ74B, the long-awaited replacement for the discontinued Toshiba 2SJ74B. This is posted…
Our friend Paul Hendriks from The Netherlands build Bruno Putzeys' demo preamp project from Linear Audio Vol 5. He produced a complete BoM which can be…
Gary Galo's article in Vol 5, "An Archival Phono Preamp" mentioned that a suitable power supply would be posted online - here it is.
It is based on…
The article from Bruno Putzeys in Vol 5 'The G-word, or, how to get your audio off the ground' is accompanied by a complimentary PCB for the demo project (courtesy Eurocircuits.com). It's a busy PCB and to help with parts placement, a larger version…
Linear Audio Volume 4 has a long-awaited article by Jack Walton, comparing a large number of low power supply regulators. Comparison includes measurements and controlled listening tests by the New Jersey Audio Club.
The article has a several…
Update 5 July 2012: Mason Green send me some info on an alternative to MathCad/MatLab: Scientific Python. He included a link to an excellent tutorial on Scientific Python. For an example of a…