Power Amp Design

Posted in My library

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

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 Héphaïtos (from L'Audiophile, 1984), and 'Amplifier transient crossover distortion resulting from temperature change of output power transistors', AES preprint 1896 (October 1982)

"Class B in a new class" by Mike Renardson, Electronics World April 1998.

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!

The 'Otala-Lohstroh' low-tim amplifier design (AES preprint H-6(R), AES convention 1973, Rotterdam, The Netherlands)


Want to build one of my designs?

I am flattered but would also like us to agree on a few rules.

My designs are the best I can make them, including reliability and safety. A lot of effort, time and money goes into them, and I enjoy doing it.

Nevertheless, I have obviously no control over how, where or when somebody would use a design of me. Therefore, I cannot guarantee that it will do as advertised in all cases and circumstances. I also have to decline any and all responsibility for any damages, direct or consequential, resulting from the use of my designs. Sorry about that, but that's how my lawyer wants it...

If you want to build one for your own use, go ahead. It would be nice if you would let me know how it all works out.

If you like to use one of my designs for a commercial product, we can discuss the terms of such use. If you plan to make money out of them, I would like to have some compensation for my work and effort as well. Or, if you are in need of a design consultant for a project, let me know. I’m sure we can work something out to mutual benefit.