Bob Cordell's Power amplifier book - Page 169 - 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 29th April 2011, 07:43 PM   #1681
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town


If only education was free and spoonfed.


The book is informative, BTW.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 29th April 2011, 07:47 PM   #1682
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
We in Scotland do have free education.
My taxes pay for that.

But we still expect the pupil/student to make an effort.
__________________
regards Andrew T.
  Reply With Quote
Old 29th April 2011, 08:15 PM   #1683
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by CBS240 View Post


If only education was free and spoonfed.


The book is informative, BTW.
Amazing...
Almost all countries have a free education system...

In Europe, i had to pay about 100$/year as education
fees in an university that is on the world Top100.....
  Reply With Quote
Old 29th April 2011, 08:25 PM   #1684
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
Quote:
My taxes pay for that.

But we still expect the pupil/student to make an effort.
Yeah, not exactly free as in 'costless' then. But internet is free at any public library. Problem is there is lots of false info floating around out there. That makes it a bit confusing.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 1st May 2011, 03:11 PM   #1685
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by CBS240 View Post
Yeah, not exactly free as in 'costless' then. But internet is free at any public library. Problem is there is lots of false info floating around out there. That makes it a bit confusing.
Hi CBS240,

I have actually found Wikipedia to be remarkably good, as long as one filters it carefully. The references that are often provided also lead to other material that can be helpful as a sanity check or for a deeper coverage of the topic. Of course, we always have to avoid the trap of thinking that anything that is "published" on the Internet is true.

Cheers,
Bob
  Reply With Quote
Old 1st May 2011, 04:37 PM   #1686
masood is offline masood  India
diyAudio Member
 
Join Date: Dec 2010
Location: fatehpur
deae sir ,
what is its cost,and how i pay?
  Reply With Quote
Old 1st May 2011, 04:44 PM   #1687
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The book should be listed with your regular book retailers, or try Amazon for a price.
__________________
regards Andrew T.
  Reply With Quote
Old 1st May 2011, 07:44 PM   #1688
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by masood View Post
deae sir ,
what is its cost,and how i pay?
Hi masood,

The retail price is $60, but it can be had in the US on Amazon for about $38. Not sure what kind of pricing is in place overseas, however.

Cheers,
Bob
  Reply With Quote
Old 2nd May 2011, 04:32 AM   #1689
PB2 is offline PB2  United States
diyAudio Member
 
PB2's Avatar
 
Join Date: Sep 2004
Location: North East
Blog Entries: 1
Hi Bob,

Wondering if you have a good substitute for the IRFP9240 since these have the odd behavior in the IR version. Do you know if the Vishay is a direct clone since I believe they
bought IR's power division. The Fairchild FQA12P20 is discontinued. Not sure of the best substitute.
__________________
Pete Basel
http://www.linkedin.com/in/petebasel
  Reply With Quote
Old 2nd May 2011, 09:12 PM   #1690
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by PB2 View Post
Hi Bob,

Wondering if you have a good substitute for the IRFP9240 since these have the odd behavior in the IR version. Do you know if the Vishay is a direct clone since I believe they
bought IR's power division. The Fairchild FQA12P20 is discontinued. Not sure of the best substitute.
Hi Pete,

These are good questions and I don't have a handy answer. However, I seem to recall having gotten some Fairchild parts that were 9240's a few years back (I think) so that I could verify for myself that the effect existed and that it did not exist in the Fairchild parts. That verification was successful in both regards.

I don't know for sure, but I'd guess that the Vishay parts have the issue, since I doubt that they would change the process, but one never knows. I have not measured any of the Vishay 9240's.

A few years back I corresponded with a guy from IRF about the issue but he was of no help. The mechanism for the effect is unclear, but in the attached notes I show how I measured it, what the results were, and speculation on the nature of the mechanism.

The measurements were done in a common-source configuration, where they show up well.

I must admit that I have not made measurements on its effect in a typical amplifier source-follower output stage configuration.

Cheers,
Bob
  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 04:05 PM.


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