New Doug Self pre-amp design... - Page 5 - 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 18th March 2012, 10:09 AM   #41
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by Joachim Gerhard View Post
Jan, you know that in the FPS i use 2 x 4 NE5534A in parallel symmetric inverted. That way i get very low distortion, low noise and tremendoes current drive.
One advantage of the NE over the LME is that it has 1/4th of the current noise. That can be important when you use it at impedances over 1kOhm for example an MM input. There it beats the LME in noise but not used as an MC input where the LME is better but not optimum. There you need AD797, LME49990 or such. There is VOLTAGE and there is CURRENT noise.
Good points Joachim.
What I meant with an earlier post, and what you are also saying, is that you should select your devices with the application and use in the circuit in mind.
For that, you need to read the article (any article) and understand the author's reasoning.
It is possible that you put more weight to one issue or another and that you make a different choice, but it's hard NOT to learn from other's ideas.

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 18th March 2012, 08:37 PM   #42
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally Posted by abraxalito View Post

Yes it is. ( This could go on ad infinitum )
Hi,

Tedious but I'll bite the bullet. Why don't you suggest alternatiive op-amps
that "should" be better in this design and reasonably justify your opinion.

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 19th March 2012, 01:10 AM   #43
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
I could only suggest opamps that sound better if I actually built the design and listened to different opamps. I have no need of a preamp so that'll never happen.
__________________
Seek not the favour of the multitude...rather the testimony of few. And number not voices, but weigh them. - Kant
The capacity for impartial observation is commonly called 'cynicism' by those who lack it.
  Reply With Quote
Old 19th March 2012, 01:24 AM   #44
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
Don't like the turnover points selected on the tone control circuits . I would prefer 50 hz instead of 100 currently used for the bass, 12 k. Instead of 10k for the highs .

10k is somewhat acceptable , the 100 hz is completely useless and while I favor full discrete designs, Im not against IC arrangements , especially since it allows one to op-amp roll , good when wanting play around with different opamps.

Last edited by a.wayne; 19th March 2012 at 01:28 AM.
  Reply With Quote
Old 19th March 2012, 02:29 AM   #45
diyAudio Member
 
Join Date: Dec 2004
Location: Bakersfield, CA
I really like the circuit design. But then again I like the good'ol NE5532. It's a great part! But the published PCB layout could definitely be improved.
__________________
Best Regards,
Carl Huff
  Reply With Quote
Old 19th March 2012, 06:15 AM   #46
gannaji is offline gannaji  India
diyAudio Member
 
Join Date: Jan 2011
Location: Hyderabad
Quote:
Originally Posted by a.wayne View Post
Don't like the turnover points selected on the tone control circuits . I would prefer 50 hz instead of 100 currently used for the bass, 12 k. Instead of 10k for the highs .

10k is somewhat acceptable , the 100 hz is completely useless and while I favor full discrete designs, Im not against IC arrangements , especially since it allows one to op-amp roll , good when wanting play around with different opamps.
Will you kindly explain why you prefer those values?
__________________
www.samritatrust.org
  Reply With Quote
Old 19th March 2012, 04:04 PM   #47
hags is offline hags  United States
diyAudio Member
 
Join Date: Nov 2004
Location: Chain o' Lakes
I see why designs by Curl, Pass, Hansen, et al, sell and designs by D. Self are found mostly in books and magazines.
__________________
"Some lures are designed to catch fish, others are designed to catch fisherman."
  Reply With Quote
Old 19th March 2012, 04:40 PM   #48
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
a.wayne wants to turn up the bass at 50hz, not the boom at 100hz.
7k to 10k treble boost is raspy, above this, such as ~12k is airy.
Ears (and many speakers) have the least performance at the farthest extents of the audio band, so if the tone controls have a limited number of selections, it would be good to do the most important things first. . . otherwise the tone controls could be really unimportant, and possibly counterproductive.

Well, it all depends on what you want. Doug Self's tone controls look like they're meant to be dialed down for LP rumble and hiss filter, not dialed up for ear contour.
  Reply With Quote
Old 19th March 2012, 04:57 PM   #49
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by hags View Post
I see why designs by Curl, Pass, Hansen, et al, sell and designs by D. Self are found mostly in books and magazines.
Actually, I'm sure Self's designs sell quite well, it's just that his name is not on them ;-)

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 19th March 2012, 05:41 PM   #50
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
Quote:
Originally Posted by hags View Post
I see why designs by Curl, Pass, Hansen, et al, sell and designs by D. Self are found mostly in books and magazines.


Quote:
Originally Posted by danielwritesbac View Post
a.wayne wants to turn up the bass at 50hz, not the boom at 100hz.
7k to 10k treble boost is raspy, above this, such as ~12k is airy.
Ears (and many speakers) have the least performance at the farthest extents of the audio band, so if the tone controls have a limited number of selections, it would be good to do the most important things first. . . otherwise the tone controls could be really unimportant, and possibly counterproductive.

Well, it all depends on what you want. Doug Self's tone controls look like they're meant to be dialed down for LP rumble and hiss filter, not dialed up for ear contour.
Good response ...

Quote:
Originally Posted by janneman View Post
Actually, I'm sure Self's designs sell quite well, it's just that his name is not on them ;-)

jan

Jan,

Could you name a few....?
  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
Doug Selfs NE5532 Power Amp. Thoughts anyone ! Mooly Chip Amps 87 15th June 2012 09:08 PM
blameless amp and doug self streetera Solid State 17 16th July 2007 11:06 PM
4th Ed. of Audio Power Amplifier Design Handbook (Doug Self) nickds1 Solid State 4 9th November 2006 01:02 PM
Doug Self Advanced Pre Amplifier PCBs macka Swap Meet 0 9th October 2006 08:41 AM
Help me design pre-amp PS hardcore Tubes / Valves 7 10th November 2004 07:32 AM


New To Site? Need Help?

All times are GMT. The time now is 10:43 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