AD843's or OPA627's with +-5V rails? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 8th February 2006, 06:00 PM   #1
Stew is offline Stew  United States
diyAudio Member
Join Date: Nov 2005
Question AD843's or OPA627's with +-5V rails?

Iím rolling output buffer opamps in my Yamaha CDC-745 and have tried AD-826, AD-823, and OPA2134 (Originals were NJM5532) with the following results:

AD826 sounded dynamic and detailed with great bass. Clear but recessed mids/vocals. Highs were detailed but a little sharp.

AD823 had the best mids,vocals, highs that I've heard. Translucent and somewhat detailed. Unfortunately upper mids and highs were also overemphasized and lower mids and bass were severely lacking.

OPA2134's sound warm but somewhat veiled. Vocals and dynamics are not as good as the AD chips but they are more balanced.

I'm considering AD843's or OPA627's with brown dog converters. Will these work OK with +-5V rails? The datasheets say they will but how do they sound with +-5V's? How do these two chips compare?

Also, Iíve seen OPA627ís on ebay for much less than retail but the ones I saw donít have the characteristic white Burr-Brown logo. Instead theyíre marked BBOPA 627AU 0103 in dark yellow type. Are these legitimate OPA627ís or fakes?
  Reply With Quote
Old 9th February 2006, 01:27 PM   #2
Stew is offline Stew  United States
diyAudio Member
Join Date: Nov 2005
Default +-5v rails

Has anyone tried AD843 or OPA627 with +-5v rails?
  Reply With Quote
Old 9th February 2006, 02:49 PM   #3
diyAudio Member
maxlorenz's Avatar
Join Date: Oct 2003
Location: osorno , Chile
I don't, but, why don't you try an independent power supply for them? (+/-12 or 15V)
I have OPA627 with 14VDC and they sound excellent to me.

Just a thought.

Good luck.
  Reply With Quote
Old 9th February 2006, 08:10 PM   #4
Stew is offline Stew  United States
diyAudio Member
Join Date: Nov 2005
According to the datasheets, these chips will both work from +-4.5v to +-18v. The specs don't appear to change dramatically over that range so hopefully they'll sound good with +-5v. One of my concerns was clipping but with a preamp input sensitivity of around 150 mv, I assume clipping won't be a problem. Is that a reasonable assumption?

If I decide to add an independent power supply, what should I look for and what do they typically cost?
  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
P3A on +/-12V rails 00940 Solid State 6 5th March 2008 12:44 PM
AD843 (I/V) + AD8620 (Buffer) = WOW Stew Digital Source 0 18th March 2006 03:52 AM
AD8620 vs. AD843 Bass? Stew Digital Source 4 23rd February 2006 07:31 PM
uk ad843 supplier? biovizier Parts 1 23rd June 2005 08:19 AM
AD843 or OPA2604 for GC buffer? dw1narso Chip Amps 0 18th March 2005 05:35 AM

New To Site? Need Help?

All times are GMT. The time now is 01:36 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