Suggestions, Opinions needed - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 27th February 2012, 01:48 AM   #1
Mikett is offline Mikett  Canada
diyAudio Member
Join Date: Aug 2003
Location: Toronto
Default Suggestions, Opinions needed

I am clearing out "junk" I have collected over the years in old circuits that I am no longer using.

I have some ICs, TL071, AD844, AD797, NE5534 (signetics) and finally a pair of LH0002 buffers.

I also have on a perfboard a 7815/7915 power supply with space for the four ics required. Some 100K stereo log pots and a 25VCT 100ma transformer.

I am thinking of making a current boosted op amp headphone amp with the above.

Can anyone suggest the best op amp from the list above to use with the LH0002 buffer and pot. I am thinking a non inverting stage followed by the buffer. What about including the buffer in the feedback or not?

Thanks for your thoughts.
  Reply With Quote
Old 27th February 2012, 02:12 AM   #2
gootee is offline gootee  United States
diyAudio Member
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Why would you ever not want to have the buffer(s) inside the feedback loop?
  Reply With Quote
Old 27th February 2012, 02:35 AM   #3
Mikett is offline Mikett  Canada
diyAudio Member
Join Date: Aug 2003
Location: Toronto
Well I don't know, so I am wanting some views.
  Reply With Quote
Old 27th February 2012, 02:03 PM   #4
diyAudio Member
Join Date: Nov 2004
Location: Germany
Do you only have one of each of these opamps? Or (hopefully) pairs?

Some of these parts are quite fast and I imagine would take some skill to implement well on perfboard.

IMO 100k pots are too high in value to be useful for anything high performance.

Assuming there are two opamps of each, this is what I'd do:

5534 (compensated for unity gain) as an input buffer --> 2k2 pot --> AD797 or AD844 for gain stage + LH0002 buffer inside feedback loop (may need feedback as suggested for capacitive load driving to get opamp GBW as seen by the buffer down - buffer bandwidth should be a good bit higher than opamp GBW/voltage gain).
  Reply With Quote
Old 27th February 2012, 02:25 PM   #5
Mikett is offline Mikett  Canada
diyAudio Member
Join Date: Aug 2003
Location: Toronto
I have pairs, With regards to the suggestion, I don't have enough space on the perfboard to implement the three IC arrangement with the forward buffer. So I am thinking of dropping the buffer as it will be driven by a Asus Xonar DG soundcard. I am thinking of using a resistor gain setting of 4.7K/1K. If so, any suggestions as to how much capacitance I should put across the 4.7k? This contraption will drive a pair of Koss Portapros and occasionally Sennheiser HD598s until I build up the Wire.
Thanks again.
  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
Crossover Help And Opinions Needed ka7niq Multi-Way 2 12th November 2006 01:49 PM
3 floorstanders-opinions needed mlankton Multi-Way 3 12th September 2006 12:35 AM
ASAP opinions needed...pls? whiteSE Solid State 3 29th October 2005 10:03 PM
Suggestions for the best preamp to match the Aleph3 !!! Opinions please !!! safetyman Pass Labs 6 19th August 2005 10:28 AM
Subwoofer opinions needed! chr Subwoofers 4 17th November 2002 09:44 PM

New To Site? Need Help?

All times are GMT. The time now is 11:01 PM.

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