Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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 11th July 2018, 09:10 PM   #381
pelayostyle is offline pelayostyle  United States
diyAudio Member
 
Join Date: Jan 2006
Location: los angeles
"WHAMMY" Pass DIY headphone amp guide
Quote:
Originally Posted by Nisbeth View Post
0.2V offset is quite a lot, are you sure that's not a typo?

AD8620 is a great sounding opamp, but just remember that it's only rated for +/-13V supplies
Sorry, I meant 0.2 mV.

About the voltage issue. I was a little scared to pop it in at first because of the voltage limit but figured what the heck because I had it lying around and knew I really liked it from other projects. It has survived over 50 hours so far. I've kept on eye on the case temperature and don't see it getting very hot at all.
  Reply With Quote
Old Yesterday, 04:38 AM   #382
seanwu is online now seanwu  Taiwan
diyAudio Member
 
Join Date: May 2016
Location: Taipei
I also tried op amp rolling with LM833, MUSES 8920D, AD823 and LME49990.
Listening with 2 headphones: SONY MDR CD900ST and Philips SHP 9500.
Source: iMac with BitPerfect and Schiit Modi 2 Uber DAC.

LM833:
Balanced treble, mid and bass. Bass is punch and assertive. Maybe not sound detail as other op amp but good enough to enjoy the music for me. If you don’t have idea what to use, LM833 definitely worth to try.

MUSES 8920D:
Sounds a little fat and muddy to me. Everything seems bigger and blurry to my ear. I even feel slight echo makes me thought about karaoke. Not my cup of tea.

AD823:
Very detailed sound. Treble is a little bit too sharp to my ear. Bass seems not as punching as LM833. Not a bed choice but I prefer LM833 over AD823.

LME49990:
Sounds balance, detailed and more silent background. Like improved LM833 with more clean and detailed sound quality. My favorite and my final choice op amp for WHAMMY headphone amp.
Attached Images
File Type: jpg AC967495-4DB1-4871-A105-F45578751408.jpg (103.0 KB, 122 views)

Last edited by seanwu; Yesterday at 04:42 AM.
  Reply With Quote
Old Yesterday, 02:01 PM   #383
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
"WHAMMY" Pass DIY headphone amp guide
Great observations! Thanks for posting them.

What Mosfet are you using?
  Reply With Quote
Old Yesterday, 02:47 PM   #384
jphabc54 is offline jphabc54
diyAudio Member
 
Join Date: Mar 2018
What adapters are you using for the opamps? Itís nice to see they can all fit between the caps.
  Reply With Quote
Old Yesterday, 02:58 PM   #385
chiily is offline chiily  United Kingdom
diyAudio Member
 
Join Date: Mar 2003
Location: Malvern
Quote:
Originally Posted by Nisbeth View Post
0.2V offset is quite a lot, are you sure that's not a typo?

AD8620 is a great sounding opamp, but just remember that it's only rated for +/-13V supplies
I have a pair of AD8620s in my Arcam 5 CD player @15v.... they have survived for the last 5 years, and sound fabulous.
__________________
Garf.
  Reply With Quote
Old Today, 06:12 AM   #386
seanwu is online now seanwu  Taiwan
diyAudio Member
 
Join Date: May 2016
Location: Taipei
Quote:
Originally Posted by 6L6 View Post
Great observations! Thanks for posting them.

What Mosfet are you using?
I use FQP3N30 / FQP3P20.
  Reply With Quote
Old Today, 06:27 AM   #387
seanwu is online now seanwu  Taiwan
diyAudio Member
 
Join Date: May 2016
Location: Taipei
Quote:
Originally Posted by jphabc54 View Post
What adapters are you using for the opamps? Itís nice to see they can all fit between the caps.
I bought these adapters online in Taiwan.
The SOIC to DIP8 is less then USD$ 1. The foot print is just slightly bigger than a DIP8 IC.
  Reply With Quote

Reply


"WHAMMY" Pass DIY headphone amp guideHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Nelson Pass "CSX1/2" "Buffered F6" Front End PCBs luvdunhill Swap Meet 7 10th December 2016 02:03 PM
Small midrange boost with conical "guide" suggestions? Phenoholic Anonymus Multi-Way 11 1st December 2014 12:00 PM
Which Pass Aleph diy board for "no-cost-object" headphone amplifier? Hammerklavier Headphone Systems 43 7th August 2010 03:35 PM
The "Dummies' Guide to getting parts/assembling CarlosFM's chipamp" Spasticteapot Chip Amps 19 18th March 2006 05:17 AM


New To Site? Need Help?

All times are GMT. The time now is 04:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki