Best buffer for a chipamp? - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 7th June 2008, 07:10 AM   #1
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Default Best buffer for a chipamp?

Hi all,

I am planning to make an unity gain stage to use for my chipamps (LM3886, LM4780 and LM3875).
Whats the best sounding buffer design?
Should I use a discrete design (i.e. Pedja Rogics JFET buffer)?
Or may I use just an OPA134 in unity gain? (I dont know if it sounds good at unity gain)
Or do you advice a better alternative?

Thanks in advance for your replies.
__________________
Best regards,
Ozgur
  Reply With Quote
Old 7th June 2008, 07:30 AM   #2
sneih is offline sneih  Indonesia
diyAudio Member
 
sneih's Avatar
 
Join Date: May 2008
waiting too
  Reply With Quote
Old 7th June 2008, 08:25 AM   #3
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Don't wait - read !
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 7th June 2008, 10:44 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
go with Pedja Rogic's FET buffer.
__________________
regards Andrew T.
  Reply With Quote
Old 7th June 2008, 04:08 PM   #5
diyAudio Member
 
ionomolo's Avatar
 
Join Date: May 2007
Location: Los Angeles
Send a message via MSN to ionomolo
I havn't tried the Pedja Rogic fet buffer, but i can tell that opamps at unity gain do sound bad.
  Reply With Quote
Old 7th June 2008, 05:43 PM   #6
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
I can't decide between Pedja's buffer and AD797 in unity gain - they are both extremely good - and if you want to drive low Z headphones too, or very long cables - go for JISBOS.
Attached Images
File Type: gif ad797 buffer.gif (4.7 KB, 1219 views)
  Reply With Quote
Old 10th June 2008, 06:29 AM   #7
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Finally I have decided to make Pedja's.. And finished in one weekend
Click the image to open in full size.
Click the image to open in full size.
Now its ready for departured! But I have a problem with the power supply. Which is;
Problem with LT1083 PSU...
I havent got any replies from Power Supply Design guys until now. May you say something? Because I am growing impatient to try my JFET buffered gainclone...
__________________
Best regards,
Ozgur
  Reply With Quote
Old 10th June 2008, 07:56 AM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
get a 20-0, 20-0Vac transformer and you won't need a regulator/s
__________________
regards Andrew T.
  Reply With Quote
Old 10th June 2008, 08:02 AM   #9
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Or replace the 1083 regs with another pair of 317/337 to see if that cures the problem.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 10th June 2008, 12:41 PM   #10
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Quote:
Originally posted by AndrewT
get a 20-0, 20-0Vac transformer and you won't need a regulator/s
But Pedja advices regulated supply in his web site...

Quote:
Originally posted by Nuuk
Or replace the 1083 regs with another pair of 317/337 to see if that cures the problem.
Hmm... With 30v supplies, one LM3875 sink more than 3.5A, in this case, do you think 317/337 will enough, especially if you take consider my speakers sensivity is just 86dB!
__________________
Best regards,
Ozgur
  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
Diamond Buffer - Super Buffer peranders Solid State 34 16th May 2010 01:46 PM
valve buffer with chipamp.com lm3886 juluska Chip Amps 0 12th January 2009 10:09 PM
Another first chipamp A Sanchez Chip Amps 18 4th June 2008 07:44 AM
Chipamp buffer / filter Nordic Chip Amps 14 24th August 2006 04:46 AM
Opamp + buffer, how to bypass buffer at HF for unity gain? Christer Solid State 10 29th October 2003 06:50 AM


New To Site? Need Help?

All times are GMT. The time now is 07:59 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