Self on Audio, 3rd Edition

Chapter 33Trimodal audio power, Part II

(Electronics World, July 1995)

Intended title: A Trimodal Power Amplifier: Part 2

The Trimodal project created a lot of new information and required some relatively subtle concepts to be explained, so two quite lengthy articles in Electronics World were needed.

I must confess I have not yet got around to implementing the idea of the Adaptive Trimodal Amplifier, which would switch from Class-A to Class-B if the heatsink got too hot. It should be a straightforward bit of electronics using a temperature sensor, very possibly the LM35, and a latching comparator. A different approach would be to control the mode on the basis of the ambient temperature, so Class-A would supplement the central heating in winter, ...