having a hard time finding.... - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 7th August 2007, 11:41 PM   #1
diyAudio Member
unclejed613's Avatar
Join Date: Dec 2006
Default having a hard time finding....

an externally compensated FET input op amp. i have an amp design i've been modelling, and most of the time it's unstable, and compensating the VAS has no effect. i finally figured out that it's most likely that the op amps i'm using in the model are internally compensated, so compensating "after the fact" won't have an effect.
i've done searches on ti.com, linear.com, and national.com with no results.
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 7th August 2007, 11:50 PM   #2
gootee is offline gootee  United States
diyAudio Member
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
You could also look at analog.com; one of the best.

Maybe I don't understand what you mean when you say that compensating an internally-compensated opamp won't have an effect. They're usually just internally compensated to be stable with a gain as low as 1. But you can still also compensate them externally.

A few details of your circuit might help to expose some other problem, in case there is one.

- Tom Gootee

  Reply With Quote
Old 8th August 2007, 03:30 AM   #3
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
Use a slower opamp.

When using an opamp for the front end of a power amplifier, a slower opamp will give better stability when you close the loop around the power stage.

(can't remember if that came from Linear or Analog app notes).
Candidates for the Darwin Award should not read this author.
  Reply With Quote


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
Hard time deciding/listening, B3N vs W3-1364s. Both sound great! GuyPanico Full Range 3 20th July 2007 12:53 AM
First time caller, long time listener... smallangryboy Introductions 15 19th March 2005 08:10 PM
Finding driver data the hard way. Luckyme Multi-Way 3 10th March 2004 12:53 PM
is doing time alignment now a waste of time? Beggar Multi-Way 9 28th July 2003 05:45 AM

New To Site? Need Help?

All times are GMT. The time now is 06:00 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2