Welcome to my place!

Audio Resource Jan Didden

It's great to have you here!

This place is where I talk about my personal projects, interests and whatnot. Not necessarily related to audio, although it often is. Under the Musings button you'll find things related to perception and conciousness which of course are very much applicable to audio!

My library lists lots of (historic) audio papers and studies that I personally find important to understand many different issues in audio.

I also have collected the interviews I've done with audio luminaries. Take some time to read and digest them - there are very interesting and worthwhile gems in each of them! My projects however is audio stuff - things I designed, wrote articles about, and my personal system. Comments and remarks are always welcome!

Last but surely not least, let me mention my publication Linear Audio. Published twice per year, over 200 pages of technical audio related articles from international authors. Article abstracts and author bio's can be read at the website, and some articles are available for free online.

So, take a look around, explore the various areas and let me know what you think!


Some interesting papers and utilities - collected with no clear plan, just caught when I came across them! 

Can an emitter follower oscillate? You bet! Triggered by a discussion  at (where else) diyaudio.com I got a few references and finally received a copy of two documents from Erik Margan. One is an excerpt from his book, Wideband Amplifiers, the other is from an ancient article in the previous incarnation of Electronics World.

Who has the perfect tip - Aalt-Joul Van Den Hul. From Audio Amateur 4/83; I am trusting that the folks at AX allow the use of this material for education purposes.

When I first met AJvdH early 80-ies he showd me a whitepaper he'd done to explain his thoughts on tips and the new tip(s) he developed. A few decades later when I interviewed hin for MultiMediaManufacturer, at the time a sister pub of aX, he had a nice story about the circumstances of those newly-developed cartridge tips. An entertaining read!

Between Amplifier and Speaker - Ivor Brown, Electronics & Wireless World, Feb 1995

Making the Best of an Audio Transformer - Norman H. Crowhurst, Audio Engineering, 1953

A great little utility called ResCalc - that calculates series/parallel resistor values for you to get that non-standard value. Written by Mark Lovell and Morgan Jones. Everything about RFI, ground loops, pin 1 problems etc for audio. An extensive library well worth perusing! Generated and/or collected by Jim Brown at Audio Systems Group

One of the best I/V stage design I ever saw is from Michael Smeedegaard, presented in his # 4326 AES preprint: "Low Input Impedance Current to Voltage conversion circuit for Current-Output DACs"

John Linsley Hoods' Linear AC amplifier Liniac - simple but high performance.

An 'ideal diode' - from Linear technology

A vintage (1963) AES paper by Langevin about IM in tape recorders.

Contribution by John Curl related to the LT1166 bias chip. The measurement circuit is here and the measurements are here.

The Lang Class A MOSFET output amplifier, originally from the German 'Elrad'  journal, reprinted by Audio Amateur.

By popular request: here is Barrie Gilberts (in)famous paper Are Opamps really Linear?

Forces in Capacitors: A study on the acoustic emissions due to mechanical vibrations in capacitors caused by magneto- and electrostriction.

Even if one million astronomers believe something, that doesn't make it true - a remarkable story about the human condition. An excerpt from Carl Sagan's "The varieties of scientific experience".

Extensive treatise by Kendall Castor-Perry about decoupling and bypassing. This is very detailed, covering a lot of angles and well-documented. A gem: Part 1; Part 2; Part 3; Part 4; Part 5; Part 6

Matti Otala's article on Interface Intermodulation from Wireless World November 1980 - the origin of the term Interface Inter-Modulation.

Peter Baxandall's clever circuit to make visible power amp V/I combinations for speaker loads.


Another year passed, another year older, another year wiser (...

Spring 2015 and I'm  again preparing for some trips:...

It's that time of year again: Oct always sees me in the US to meet lost of old friends, authors and make new ones! And it's audio that binds us. First, on 6 October, will be Burning Amp in...