How to make an Headphone amp on breadboard...? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 6th February 2012, 12:49 PM   #21
diyAudio Member
 
Join Date: Nov 2004
Location: Germany
The basic idea behind a diamond buffer is using two emitter follower stages to shift the signal up and then down again (and vice versa), so that it ultimately ends up at about the same DC level but with much higher current delivering abilities. You could also do this in single ended, but here it's extended to a fully complementary topology for better performance.

BTW, in my headphone amp simulation adventures a while back I tried both complementary emitter follower and diamond buffer outputs. While the diamond buffer generally had lower distortion when run open-loop, within a feedback loop things looked quite different. The DB's additional pole (remember it's a two-stage buffer) meant that I had to reduce open-loop gain considerably in order to get things unconditionally stable, so in the end it actually performed worse than the simple EF output at similar or higher quiescent current levels. That was a bit disappointing.

I did eventually manage to reduce output stage distortion even further with a nested feedback approach (using two opamps). Getting that thing stable wasn't terribly easy though.
  Reply With Quote
Old 6th February 2012, 01:33 PM   #22
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Thank you for the information and clarification. The Diamond is a more complex circuit than a simple EF. It clearly goes against the design doctrine of Mr. Nelson Pass which is to keep the circuit simple. Your results do reflect the impact of this complexity.
  Reply With Quote
Old 9th February 2012, 09:34 PM   #23
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Please goto the thread " A headphone Transconductance amp for a change!" for more discussion details.
  Reply With Quote
Old 18th February 2012, 04:15 PM   #24
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
I have simplified the headphone transconductance amp above which is built on an Experimenter's Proto Board. The amp started as a diamond buffer configuration; but now uses only two complemetary transistors working in the common emitter configuration. Fortunately, it still can be simplified futher!.
  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
Breadboard amp = echoes + highpass filter? dopeydavoid Solid State 2 12th April 2011 12:50 PM
breadboard headphone jack mbates14 Headphone Systems 2 9th November 2008 03:11 PM


New To Site? Need Help?

All times are GMT. The time now is 05:08 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