Looks like he's using TPC in that circuit. The epic battle between TPC and TMC continues...
The design works, the PCB however does not provide the performance the design is capable of.
Self and Slone wrote about 2-pole compensation before our Edmond Stuart started promoting TMC so they really didn't participate an any "controversy" over TMC - anything besides single pole Miller Cdom was exotic enough at the time for audio power amps
Looks like Slone's book has a new edition, but Amazon claims it's out of print. So I only ordered Self's book, along with Bob Cordell's.
I get the impression that the newer 2011 Slone book is a reprint of the 1999 one. Slone passed away in April 2010. Now of course there could be some differences between the two versions, changes he wanted made to the book before he died for example.
I heard a rumor that Slone had worked on a scheme to lower crossover distortion and was ready to publish some results, maybe if we lucky there is some information on this in the new edition.
Randy passed away last year before finishing the book. The publisher says, this is hearsay from another thread, the book won't be published.
David.
David.
Hi all -
I know this is an old thread, but I came across D. Self while doing a little research on amps. I don't mean to start anything here, but what a breath of fresh air that first sentence speaks. I'm not an engineer by trade, but I've always believe that if you want to expect the results of a design, it's the electrical and mathematical science involved and not some voodoo feeling about the circuit that makes it work properly.
I've gone round and round on another favorite audio site of mine, where arguments are continually dismissive about specs and their importance in the design and even more importantly - to what your hear. You simply cannot throw parts at a circuit and expect it to behave (sound) anything remotely like it was intended. Some people go as far as a wholesale replacement of circuit parts to fix a problem, or in an effort to get it to sound better. WTF? That's not the way it's done!
I'm just starting my adventures into building amps (not designing them), and I've already learned much from the coherent discussions here on DIYAudio. They make me yearn for more.
You could design and build the 'perfect' amp/PCB that on it's own would perform flawlessly. But, what are the potential hazards that could affect the operation/sound by a misguided, or even faulty layout within the enclosure? How it's interacting with the other 'noise' that may be around? These are those second order factors that must be considered. The total design and packaging for that quintessential amp - straight-wire with gain. 🙂
True. Douglas Self's 6th edition of APAD is the single most important book ever published on audio power amplifier design.
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