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Old 27th February 2013, 06:43 PM   #21
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Originally Posted by FdW View Post
Douglas,

After reading the 5th edition (and I liked it very much)?

1) A bit more on different topologies.
2) Selection help on power transistors.
3) Selection help on driver transistors.
4) Different compensation schemes.
5) More about CFB and comparing CFB/VFB.
6) What next? Let me rephrase, now that we have these very good tools, simulation and real, and now that we have these very good designs, how do we progress, where is the next frontier, what needs to be done. This is not about the answers, but more about the remaining questions. Like, what do I need to solve to make a real contribution Give us something to set our teeth in

Regards,
Frans.
There will be a lot more on 1 and 4, and some more on 2 and 3.

5, probably not.

Thanks for your help.
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Old 27th February 2013, 06:48 PM   #22
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How about designing stable solid state output buffers for hybrids with tube inputs.
That really is not going to happen.
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Old 27th February 2013, 06:49 PM   #23
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Hmmm... I only have the 3rd edition for reference.

Protection circuits seem to be "the in thing" at the moment. How about a detailed comparison of relay vs solid state.
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Old 27th February 2013, 06:51 PM   #24
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Doug,
What time frame are you looking at to produce another book? I already have two of your books and was looking at the current amplifier book you already have to add to my collection. Will you offer any kind of pre-purchase for the book for the DIY crowd. I think that Cordell already has a fairly simple couple of chapters on class D for those that want to read about that. As you say it is a completely different animal to an analog approach. Another area that could use some work is on the power supply side design and perhaps even something on circuit layout and minimization of ground loops and ground plan pointers.
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Old 27th February 2013, 06:55 PM   #25
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Quote:
6) What next? Let me rephrase, now that we have these very good tools, simulation and real, and now that we have these very good designs, how do we progress, where is the next frontier, what needs to be done. This is not about the answers, but more about the remaining questions. Like, what do I need to solve to make a real contribution Give us something to set our teeth in
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Originally Posted by DouglasSelf View Post
There will be a lot more on 1 and 4, and some more on 2 and 3.

5, probably not.

Thanks for your help.
Thanks for your response; I will surely be buying, and reading, the new book.

Do you have any thoughts about point 6, or is it too far out

Regards,
Frans.
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Old 27th February 2013, 06:57 PM   #26
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Mr. Self,
I parrot what others are saying here and would expand on an area of the chip amps that I do not see much in the technical literature. That would be higher power applications using chip amps. How best to implement bridge/parallel circuits using these chip amps for higher power requirements. All the information that I find, most from the former National Semi, has been discredited by most on this diy forum as being poorly implemented and problematic. Many are attempting to use these chips as can be seen by the many gainclone threads but the higher power applications are lacking.
My experience with chip amps (or anyway some of them) is quite extensive. It is not however happy. I find them unreliable- even now, apparently reputable manufacturers will produce whole batches that fail quickly, though not quickly enough to be caught during test. A nightmare.

It is for this reason I give this topic a low priority.


I am afraid I am not able to answer everyone individually, but thank you all for your help.
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Old 27th February 2013, 07:01 PM   #27
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Originally Posted by Kindhornman View Post
Doug,
What time frame are you looking at to produce another book? I already have two of your books and was looking at the current amplifier book you already have to add to my collection. Will you offer any kind of pre-purchase for the book for the DIY crowd. I think that Cordell already has a fairly simple couple of chapters on class D for those that want to read about that. As you say it is a completely different animal to an analog approach. Another area that could use some work is on the power supply side design and perhaps even something on circuit layout and minimization of ground loops and ground plan pointers.

I hope it will be this year, but I cannot give you anything like a firm date. Getting a book into print takes longer than you might think.
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Old 27th February 2013, 07:15 PM   #28
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My experience with chip amps (or anyway some of them) is quite extensive. It is not however happy. I find them unreliable- even now, apparently reputable manufacturers will produce whole batches that fail quickly, though not quickly enough to be caught during test. A nightmare.

It is for this reason I give this topic a low priority.

I am afraid I am not able to answer everyone individually, but thank you all for your help.
Hello

Maby you could do a thread in the forum about those problems with chip amps ?

If you are tight in time, maby you can start this thread by a short overview of the problems that you have faced with chip amps, and a discution by the forum members will follow.

Thank

Bye

Gaetan

Last edited by gaetan8888; 27th February 2013 at 07:19 PM.
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Old 27th February 2013, 07:16 PM   #29
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Douglas,
I understand the undertaking it is for writing a book, I was once asked to do that and got as far as the outline and saw how much work it was going to take. It was in a totally different field but I feel for anyone attempting to do it on any technical subject. I may go back and do it now that I am not under the gun so to speak, but it is a tremendous amount of work. I appreciate the Self On Audio book and the Active Crossover books, both well written.

Steven
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Old 27th February 2013, 08:51 PM   #30
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Hi
Do you build and test your own designs, or is only simulated?
I think it is a difference between simulation and then testing the real thing.
But I loved your articles in wireless world and electronics and the pwr amp design book 3rd edition. I built the blameless class a amp, not bad.
Best regards,
Williams
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