Bob Cordell's Power amplifier book - Page 251 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th December 2012, 06:01 AM   #2501
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Quote:
Originally Posted by wahab View Post
Increasing the compensation seems more cautious imo.
That's what the RC does, isn't it? RC Shuntcomp is legit, man.
  Reply With Quote
Old 11th December 2012, 05:13 PM   #2502
Struth is offline Struth  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

I think it is incorrect to limit or skew the acceptability of RC compensation of the LTP outputs to just "approved by golden ears". Measurement confirms the positive benefits and respected (not fringe) designers use this method. Cordell clearly demonstrated this approach to be effective as a part of one that separates slew rate from compensation values.

Have fun
Kevin O'Connor
__________________
London Power / Power Press Publishing
www.londonpower.com
  Reply With Quote
Old 11th December 2012, 10:54 PM   #2503
diyAudio Member
 
Edmond Stuart's Avatar
 
Join Date: Nov 2003
Location: Amsterdam
Default /OT

Quote:
Originally Posted by HarryDymond View Post
Hi Edmond,
What are you planning to use as the signal source? How are you going to generate a sinewave with distortion low enough to match your analyser?
Hi Harry,

The primary signal source is the DAC of the sound card. For low level THD measurements I also use bandpass filters. In addition, an external signal source can be used.

Quote:
Originally Posted by Dave Zan View Post
I am interested in this discussion of software audio test systems but perhaps it should be moved to a new thread? People may feel freer to contribute if they are not worried that they hijack the Cordell discussion.
David
Hi Dave,

You're right, we better discuss these matters in a new thread, though I feel reluctant to start it right now, as I'm still in the development phase.

@ Bob: Sorry for hijacking your thread.

Quote:
Originally Posted by jcx View Post
...
you can cobble together stuff to beat maybe one or two parameters in a dedicated test
but by the time you box up the rigs, fixtures, wrote software to do even 10% of what a modern AP does you would have saved time working minimum wage to buy the AP
Hi JCX,

Very true! Though I don't mind, as I'm retired and have all the time of the world.
BTW, the same applies to building your own amp.

Cheers,
E.
__________________
Een volk dat voor tirannen zwicht, zal meer dan lijf en
goed verliezen dan dooft het licht…(H.M. van Randwijk)
  Reply With Quote
Old 12th December 2012, 12:58 AM   #2504
diyAudio Member
 
Join Date: Nov 2012
How technical is this book?

Or let's say, if it were a text for a college class what would the pre-reqs for the class be?
  Reply With Quote
Old 12th December 2012, 01:17 AM   #2505
diyAudio Member
 
dchisholm's Avatar
 
Join Date: Mar 2011
Location: St Louis, Mo
Quote:
Originally Posted by dmbaile2 View Post
How technical is this book?

Or let's say, if it were a text for a college class what would the pre-reqs for the class be?
In my opinion it does a good job of spanning quite a range of understanding and abilities. High-school algebra is probably a requirement to really understand the discussion. Aside from that, a dedicated high school student (especially with an introductory class in basic electronics) would probably find most of it useful and understandable, though some sections would be set aside for future study; and a college graduate electrical engineer would likewise find most of it useful and understandable, though some sections would be quickly skimmed.

Dale
  Reply With Quote
Old 12th December 2012, 01:33 AM   #2506
Struth is offline Struth  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

Bob's book only requires high-school math and schematic reading skills unless you want to venture into the chapters about simulating circuits. Same goes for Self's books and my books without the sim stuff.

Have fun
Kevin O'Connor
__________________
London Power / Power Press Publishing
www.londonpower.com
  Reply With Quote
Old 12th December 2012, 01:38 AM   #2507
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by keantoken View Post
That's what the RC does, isn't it?
Yes , although with a brute force method that load the input stage abruptly...
  Reply With Quote
Old 12th December 2012, 02:46 AM   #2508
Struth is offline Struth  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

Standard miller compensation seems much more brute-force than the RC across the diff output. The latter comes into play in the 100kHz+ range - often much higher even than this. Miller seems much more like "strangling" the circuitry.

Have fun
Kevin O'Connor
__________________
London Power / Power Press Publishing
www.londonpower.com
  Reply With Quote
Old 12th December 2012, 03:14 AM   #2509
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Quote:
Originally Posted by wahab View Post
Yes , although with a brute force method that load the input stage abruptly...
Actually, RC shuntcomp applied correctly has great finesse... But you have to know how to apply it and when. Edmund's TIS is a good example of RC shuntcomp. My old headphone amp is another example, though it is pretty old and not necessarily a good one. Oh yeah and Symasym.
  Reply With Quote
Old 12th December 2012, 11:20 AM   #2510
Bonsai is offline Bonsai  Taiwan
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Taipei, Taiwan
Quote:
Originally Posted by Struth View Post
Hi Guys

Standard miller compensation seems much more brute-force than the RC across the diff output. The latter comes into play in the 100kHz+ range - often much higher even than this. Miller seems much more like "strangling" the circuitry.

Have fun
Kevin O'Connor
The miller cap applies local feedback around the TIS (VAS) and actually linearizes it. It's actually a very elegant solution.

If you wan more sophistication, then you need to move to MIC, TMC or the like. This will help with speed (MIC) and TMC gets you another 15 dB of loop gain at HF without too much trouble.
__________________
bonsai
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Another realization of Bob Cordell's THD Analyzer giulianodes Equipment & Tools 37 9th October 2013 03:48 AM
best audio amplifier book?? Bouvett Everything Else 30 13th August 2012 03:43 AM
Amplifier Design Book pixie Everything Else 27 11th June 2010 09:36 PM
Project 11.1 from Slone "High-Power Amplifier" Book Karl71 Solid State 46 6th October 2008 04:47 AM
book-audio power amplifier by Douglas Self mikee12345 Solid State 8 16th November 2003 02:16 AM


New To Site? Need Help?

All times are GMT. The time now is 04:25 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2