The Objective2 (O2) Headphone Amp DIY Project - Page 100 - 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
Reply
 
Thread Tools Search this Thread
Old 30th November 2011, 06:57 PM   #991
jtktam is offline jtktam  Canada
diyAudio Member
 
Join Date: Apr 2009
Location: Toronto, Ontario, Canada
Blog Entries: 17
Sorry I might have missed the post, but what was the changes to the BOM?

-joe
  Reply With Quote
Old 30th November 2011, 07:07 PM   #992
diyAudio Member
 
RocketScientist's Avatar
 
Join Date: Mar 2008
Location: Northwest
Just what's in the previous post (990). Two resistor values were changed to help the amp stay off when it shuts down with very low batteries. There's more in this thread and the O2 Details article. Otherwise I just cleaned up the BOM to reflect stock and pricing at Mouser.
__________________
http://nwavguy.com - Personal non-commercial audio blog
  Reply With Quote
Old 30th November 2011, 07:41 PM   #993
diyAudio Member
 
Join Date: Feb 2010
Nice. I just ordered from Mouser ... Luckily resistors are much easier to source from here locally than for example those op amps or MOSFETs
In a local electronics store the NJM4556 costs 3 euros
  Reply With Quote
Old 30th November 2011, 07:41 PM   #994
jtktam is offline jtktam  Canada
diyAudio Member
 
Join Date: Apr 2009
Location: Toronto, Ontario, Canada
Blog Entries: 17
Is it ok to stay with the old BOM since I ordered like 100 of everything :-P

-joe
  Reply With Quote
Old 30th November 2011, 08:03 PM   #995
diyAudio Member
 
Join Date: Feb 2010
Quote:
Originally Posted by jtktam View Post
Is it ok to stay with the old BOM since I ordered like 100 of everything :-P

-joe


You need to buy some O2 boards and build some for sale
  Reply With Quote
Old 30th November 2011, 08:06 PM   #996
Jokener is offline Jokener  Germany
diyAudio Member
 
Join Date: Sep 2010
Location: Good ol' Germany
Coming right up.
As soon as my current GB's first round closes, I'll build some units for sale.
Since I also have the cases and everything else, I can offer fully assembled units.
I just need to figure out a way to test them first.
(Testing as in testing them with measuring equipment other than a cheapo-DMM.)

Best regards,
Jokener
__________________
New O2 Amplifier GB: Order Thread, Order Status PDF (Password: diyaudio.com)
Pictures of the GB are in the Gallery: Click me! (User & Password: diyaudio.com)
  Reply With Quote
Old 30th November 2011, 10:12 PM   #997
keyd is offline keyd  United States
diyAudio Member
 
Join Date: Jan 2010
Finished mine last night, sounds really good. With HD600 not to dark but not too light; reminds me of RA1/RS1 combo in some ways but much better and balanced. Wish I still had my grados, they would sound nice with this amp. Im running mine without battery and with a grubdac which fits in case without batteries. Waiting on front panel from the group buy.
  Reply With Quote
Old 30th November 2011, 10:49 PM   #998
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
RocketScientist - good find on those Lelon 470uF caps in the new spreadsheet BOM! 50% higher ripple current rating and 50% more rated life for 1/2 the cost. I had missed those.
  Reply With Quote
Old 30th November 2011, 11:20 PM   #999
MrSlim is offline MrSlim  Canada
diyAudio Member
 
Join Date: Jun 2009
Location: Ottawa, Ontario
Blog Entries: 2
Quote:
Originally Posted by Spacehead View Post


You need to buy some O2 boards and build some for sale
I think he is... did you check the Vendor Bazar?

o2 amp building
  Reply With Quote
Old 30th November 2011, 11:52 PM   #1000
diyAudio Member
 
RocketScientist's Avatar
 
Join Date: Mar 2008
Location: Northwest
Quote:
Originally Posted by jtktam View Post
Is it ok to stay with the old BOM since I ordered like 100 of everything :-P
Yes, no worries. If you want to spend a couple dollars on 100 each 1.2M - 1.5M and 33K 1/8 watt resistors (even 5% are OK) you might want to use those for R25 and R9 but it's not required and doesn't change the audio performance at all (just the low battery shutdown behavior). The other changes were about saving money and/or what's in stock at Mouser.
__________________
http://nwavguy.com - Personal non-commercial audio blog
  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
Headphone amp project grahamfocal Headphone Systems 7 21st June 2011 05:28 PM
My latest project - DAC + headphone amp gmarsh Digital Line Level 105 13th December 2010 02:31 PM
My headphone amp project trifidmaster Headphone Systems 2 22nd December 2008 03:52 PM
Mini Ipod headphone amp DIY project Nordic Headphone Systems 14 11th March 2007 02:35 PM
Need help for a battery headphone amp project dismalonyx Headphone Systems 1 15th April 2004 11:22 PM


New To Site? Need Help?

All times are GMT. The time now is 03:51 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
Wiki