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!

Power Amp Design


A veritable smorgasbord of historical articles is maintanted and still being extended by Douglas Self. Especially his Wireless World section of articles is priceless, but in general his site has lots of interesting info.

Audio design leaps forward? Giovanni Stochino, EW&WW, Oct 1994.

Amplifier design for low Transient Intermodulation Distortion - Matti Otala's Low Tim Amplifier from AES preprint H-6(R) from Feb 1973. This was actually a joint design effort with Dutch designer Jan Lohstroh - read my interview with Jan Lohstroh for more insight. This is the original AES preprint for the 'Otala-Lohstroh' low-tim amplifier design (AES preprint H-6(R), AES convention 1973, Rotterdam, The Netherlands).

Several vintage documents on thermal distortion in power stages, resulting from signal-related die temperature changes. Also called 'memory distortion': 'La distorsion thermique' Part I, Part II, by Héphaütos (from L'Audiophile, 1984), and 'Amplifier transient crossover distortion resulting from temperature change of output power transistors', AES preprint 1896 (October 1982). This is a subject that has intrigued me for many years and in 2014 I did some experiments to find out if there was anything to it. My conclusion: memory distortion (from thermal transients) does existst but is very unlikely to be audible. You can read my report in Linear Audio Volume 9.

"Class B in a new class" by Mike Renardson, Electronics World April 1998. One of several designs that have been promoted over the years to improve class (A)B designs by, in this case, ensuring that none of the output stage halves ever turn off, thereby greatly decreasing crossover distortion.

A classical amplifier in the mid-70-ies was the 'Barney amplifier'. Designed by Barney Oliver at HP, and manufactured, tested and documented as a regular HP piece of equipment. The Tech- & User Manual is here. A gem!