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New year's resolution
How would you explain to a novice how to design a valve
amplifier? I see two possible approaches. One way to begin is to establish the purpose of the machine, divide that purpose into a series of processes, and develop a block diagram of a generic amplifier. The other is to examine various circuit fragments in order to understand how they, and their components, behave. These two approaches may be termed "top down" and "bottom up", respectively. Most books on design cover both aspects, in one order or the other. Both can be dealt with using the common logic of analysis. Both are problematic. Whichever aspect the novice encounters first, he will be bemused for lack of prior understanding of the other. It's hard to grasp a block diagram without knowing what might be inside the boxes and why; and it's hard to grasp a fragment such as a mu-follower without knowing what it might be used for and why. Perhaps the novice could be reassured if, in a preface, the author were to acknowledge these problems, and provide some logic that the novice might employ to guide him through the process of learning to design? This year I have resolved to write such a preface. Ideas are welcome. Is the process of design predictable? Can you characterise the logic of development, from start to finish? The best structure, by far, I have come across is in the late J L Hood's "Valve and Transistor Audio Amplifiers". Typical circuits are introduced and analysed in historical context, so the reader becomes aware of the issues in just the same way as history did. However, the reason for using such a narrative style is not made explicit, and so the novice may not get the point. New valve enthusiasts, and especially young people, are needed or there'll be nothing left when we all die. Which won't be this year, I hope. Anyone else made a resolution. Best wishes, Ian |
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