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Old 22nd February 2013, 12:31 AM   #11
Junm is offline Junm  Philippines
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How about designing stable solid state output buffers for hybrids with tube inputs.
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Old 22nd February 2013, 01:59 AM   #12
Bigun is offline Bigun  Canada
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I think Class D is particularly important. I honestly believe this is the future of audio power amplifiers for the majority of applications. But it's a fast changing field and already it has plenty of people dismissing it because of the poor implementation of the past. Providing clarity on the performance of state of art Class D and how the hobbyist can access it maybe of interest.

Surface mount components are also mainstream. Some hobbyists are afraid to use this technology despite the advantages - parts don't need to be microscopic and they can be mixed with through-hole to take advantage of what both have to offer.

Digital to Analogue is perhaps the Source for most material we will feed into our amplifiers. Perhaps D to A should receive more attention.

p.s. your writings have been a very important guide for me in this hobby - thank you and keep it up !!!!
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Old 22nd February 2013, 02:17 AM   #13
maiky76 is offline maiky76  France
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Hi,

What about some insights regarding headphone amps that could driver equialy well 16 - 600R HP?
M
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Old 22nd February 2013, 02:35 AM   #14
Johno is offline Johno  Australia
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I would like to see more analysis of alternative configurations - particularly the common base with its low noise and low input impedance, eg its application to phono pre-amps and equalisation. Leach has been there I know and Phillips published some application notes in the late 1960's for their then 'state of the art' transistor offerings.

I seem to remember some really clever stuff that appears to no longer be general knowledge. Alas, I lack the wit to re-create it.
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Old 23rd February 2013, 05:47 PM   #15
Belaji is offline Belaji  United States
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Hello,

I was the layout guy for the silicon on the National LM6161, one of the first opamp's to use fast PNPs. I'd like to see you speak about Folded Cascodes in power amplifiers (one of my my current interests).

Thanks for all your good information. I am a big fan.

Bela
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Old 27th February 2013, 06:20 PM   #16
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Default Thank you

Many thanks to you all for your replies. Sorry it has taken so long to get back to you, but work has been pressing recently.

I will respond to your suggestions shortly.
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Old 27th February 2013, 06:29 PM   #17
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Quote:
Originally Posted by Dave Zan View Post
Main ones that jump to mind.

1. Improved treatment of double differential IPS. The VAS current indeterminacy is barely mentioned. Lot of stuff in DIYaudio on this
That is going to be dealt with in depth.
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2. Better treatment of 2 pole. TPC and TMC. DIYaudio and also Harry Dymond's article and updates.
Same here. Err.. doesn't TPC mean 2-pole compensation?
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3. Noise in current mirrors. Samuel Groner has an excellent article that covers this and several other comments on your book.
This too is already planned, with full attribution to Samuel for an article that is indeed truly excellent.

Quote:
4. Improved Thermal Trak bias spreaders.
This was planned, but it is now uncertain if I will have time to dig into it very deeply.

Quote:
5. Nested feedback and advanced compensation schemes.
A good deal of content on this is already planned.

Quote:
I also have a few typos and errors. Do you want them here or in a PM?
PM might be best. You can get my email address from the front page of my website.

Thanks for your help.
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Old 27th February 2013, 06:37 PM   #18
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Quote:
Originally Posted by djoffe View Post
Is the topic of switching power amps, e.g. class D, in its various forms, kind of outside the range of what you think is appropriate for the book? I know that 5th edition had a small chapter on this, but I was curious how much expansion you were planning for this chapter.
Akitika GT-101
Well yes, it is really outside. Class-D has almost nothing in common with the rest of the book, except that the final goal is to drive a loudspeaker. It really requires a separate book, but I have no plans to write it. Someone else care to have a go?
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Old 27th February 2013, 06:39 PM   #19
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Quote:
Originally Posted by Bonsai View Post
I echo Dave Zan's requests.

I would also add

Thermal compensation - especially triples
Stability of EF3's
I would like to add more on these, but time & space are a factor.

Love the avatar.
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Old 27th February 2013, 06:41 PM   #20
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Quote:
Originally Posted by mlloyd1 View Post
Doug:
Thanks for asking. I agree with Dave Zan's comments.
I especially would like your analytical rigor applied to alternate topologies.
mlloyd1
You will not be disappointed.

Thanks for your help.
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