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jan.didden jan.didden is offline

diyAudio Member

About Me

  • About jan.didden
    The great city of Turnhout, BE
    Real Name
    Jan Didden
    Author Bio
    Jan Didden built his first OTL amp with 807 tubes 40+ years ago. Now retired from a career with the Netherlands Airforce and NATO he tries to finish all those accumulated unfinished projects. His main interest is power amps and his endeavours are documented on his website.
    Author Name
    Jan Didden
  • Signature
    Music is dither to the brain; lets me think below the usual chaos - me
    Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher


Total Posts
General Information
  • Last Activity: Today 09:40 PM
  • Join Date: 16th May 2002


Showing Friends 1 to 9 of 9


Latest Blog Entry

Posted 27th December 2016 at 11:48 AM by jan.didden Comments 33
Posted in Uncategorized
This blog is not about audio. Or at least not in the sense of a design or equipment discussion. It's about how we as humans tick, and possible (probable?) implications for how we form opinions and views about what we hear, about a particular design or sound.

My long-standing interest in this area was recently triggered again by a couple of posts from Mark4w, and a book he recommended (Thinking, Fast and Slow, by Daniel Kahneman). At about the time I received the book I also fell into a scientific discussion on the TV about the process our brain goes through to form an opinion and serve that up to our conscience as 'this is how it is'.

I thought back about all the discussions I've had on diyaudio about sighted versus blind listening. Without opening up Pandora's box yet again, in a nutshell: The brain uses every input it can get its hand on to form an opinion. So when you listen to, say, a new amp, the brain not only uses the sound coming in through your ears,...

Posted 9th December 2013 at 07:52 AM by jan.didden Comments 18
Posted in Uncategorized
It’s a recurrent issue: you want to build a preamp, a DAC, a phono stage, anything that needs a nominal supply voltage between 3.3 and 15VDC, positive and/or negative polarity. Sometimes you want several supplies to isolate stages from mutual interference via the power supply. So you want a power supply regulator that approaches an ideal DC voltage source as best as possible within reasonable cost. In your search, you inevitably run into the term ‘superreg’ – so where does the name come from and what is it?

The history of very high performance low-voltage regulators is well documented on Walt Jung’s website ( – look under Library|Regulators & References). An early design that attracted attention was Mike Sulzer’s, published in 1980 and 1981 in Audio Amateur. I added something to that in 1987, and then I was invited by Walt Jung to work on a further improved version. This was published in a series of four articles in Audio Amateur in 1995 by Walt (part...

Posted 8th September 2011 at 02:55 PM by jan.didden Comments 0
Posted in Uncategorized
Well, I did already a blog on feedback, it's uses, misuses and misconceptions. But there is someone who can explain it much better than I can, someone who has proven that he really understands what's going on in a feedback amplifier. Someone who knows what the terms 'fast amplifier' and 'slow amplifier' really mean (and what not). Enter Bruno Putzeys, who wrote the article with the subject name in my bookzine Linear Audio, Volume 1. I feel that this is such an important matter for audio that I decided to place it online for free download. You'll find it at Linear Audio | your tech audio resource under the tab Online resources.
Enjoy the ride, and do let me know what you think about these issues.

jan didden

Posted 3rd November 2010 at 05:19 AM by jan.didden Comments 3
Posted in Uncategorized
Just a couple of days ago I posted something to try to debunk that tired old myth that 'feedback always comes too late and therefor can't work'. Apart from the fact that obviously it does work, which makes the first statement pretty stupid to begin with, here's my take on it.

The myth may result from an often repeated misconception that feedback comes 'after the fact' and therefore always comes too late.
This has been shown to not be the case over and over again but if you have no engineering background it may be difficult to grasp the concept. Let me try to help.

Obviously, there is a signal delay in an amp from input to output and back to the input through the feedback loop. Since the feedback loop is generally a pair of resistors, the bulk of the delay is in the amp. That is the case both in non-feedback as well as in feedback amps. Such delays are very small, often fractions of a microsecond, and in this context can be ignored.


Posted 15th June 2010 at 04:21 PM by jan.didden Comments 28
Posted in Uncategorized
I didn't get it. There are gifted design engineers on this forum. They get involved in threads. BUT, in most cases, eventually an 'issue' develops and the engineering guy gets binned or banned or asks to be banned. Why why why? Happened to me a few times. Not that I got banned, thank Ohm, but I got close to leaving because I too got enough of it.
Of what?
Let me explain. Most engineering types like to explain things, to tell others with less experience and knowledge what they are doing wrong and how they can do it better. They inundate you with facts, figures, links to engineering papers etc, and expect that the other guy flows over with gratitude. But, funny enough, it doesn't happen that way. The 'other guy' gets pissed off from being corrected all the time. Hell, he didn't come here for that, he came to have fun, discuss his hobby and his latest creation.

[flashback] At the time Al Gore's An inconvenient Truth came out, the same director (!) also made Too...
Recent Comments
I didn't try to make...
Posted 2nd January 2017 at 09:24 PM by mmerrill99 mmerrill99 is online now
Sorry Sir, you tried...
Posted 2nd January 2017 at 05:56 PM by jan.didden jan.didden is offline
Ah, so you looked at...
Posted 2nd January 2017 at 05:40 PM by mmerrill99 mmerrill99 is online now
Ohh well, the sucker...
Posted 2nd January 2017 at 01:46 PM by jan.didden jan.didden is offline
OK, Jan, then seeing...
Posted 31st December 2016 at 02:10 PM by mmerrill99 mmerrill99 is online now
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