The Objective2 (O2) Headphone Amp DIY Project - Page 142 - 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 12th December 2011, 10:55 PM   #1411
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
Quote:
Originally Posted by oslpag View Post
Thanks for the info. I am not too worried about the output plug, that can easily be sorted out. I will get one and see how it goes as it is not so expensive.

Thanks again
Yep, you can always just cut the plug off and put on a 2.1mm if needed.
  Reply With Quote
Old 13th December 2011, 12:01 AM   #1412
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
Quote:
Originally Posted by Limp View Post
I'm getting 24V across C8 and C9.
Bugger, I guess that means being careful with those MOSFETs just isn't careful enough.
Just curious - which mosfets from those listed on the BOM did you use (which part numbers)?
  Reply With Quote
Old 13th December 2011, 07:39 AM   #1413
timpert is offline timpert  Netherlands
diyAudio Member
 
timpert's Avatar
 
Join Date: Nov 2004
Location: Netherlands
Default interest in walkthrough?

Some days ago I announced that I would write a step-by-step walkthrough for the construction of the O2. Problem is, I got sick and now I have some catching up to do with other things. Given the lukewarm response to my initial announcement, I am now in doubt if I should continue making the walkthrough or not. If there's sufficient interest in it, I will finish it in a while, if not, I will simply abandon my current effort and move on to other things. Just let me know.
  Reply With Quote
Old 13th December 2011, 09:18 AM   #1414
diyAudio Member
 
Join Date: Oct 2011
Location: North West, UK
Blog Entries: 7
Quote:
Originally Posted by oslpag View Post
I am having a nightmare trying to find a power supplier for the O2 here in the UK. I have found this, would it work for the UK?
Oslpag, I'm using this ac-ac multi-voltage adaptor from Maplin [it's the one listed in the BOM], measures just over 17v unloaded when set to 15vac out.

Paul
__________________
Listening with Gusto!
  Reply With Quote
Old 13th December 2011, 09:24 AM   #1415
oslpag is offline oslpag  Sweden
diyAudio Member
 
Join Date: Nov 2011
Quote:
Originally Posted by BuildMeSomething View Post
Oslpag, I'm using this ac-ac multi-voltage adaptor from Maplin [it's the one listed in the BOM], measures just over 17v unloaded when set to 15vac out.

Paul
Thanks Paul, don't know how I missed that one?
  Reply With Quote
Old 13th December 2011, 09:34 AM   #1416
Limp is offline Limp  Norway
diyAudio Member
 
Limp's Avatar
 
Join Date: Oct 2010
Location: Bergen
Quote:
Originally Posted by agdr View Post
Just curious - which mosfets from those listed on the BOM did you use (which part numbers)?
FQU17P06 for Pch and the Nch says FQPF10N20C. It's what was supplied with Jokeners kit.
I have now replaced both MOSFETs and all tests seem ok. I get ~250mV on the Low Voltage Shutdown test, but there is still very loud 'pop' when I turn it on.

Last edited by Limp; 13th December 2011 at 09:38 AM.
  Reply With Quote
Old 13th December 2011, 01:29 PM   #1417
diyAudio Member
 
Join Date: Nov 2011
Location: Surrey
Quote:
Originally Posted by timpert View Post
Some days ago I announced that I would write a step-by-step walkthrough for the construction of the O2. Problem is, I got sick and now I have some catching up to do with other things. Given the lukewarm response to my initial announcement, I am now in doubt if I should continue making the walkthrough or not. If there's sufficient interest in it, I will finish it in a while, if not, I will simply abandon my current effort and move on to other things. Just let me know.
I for one would be delighted by such a guide. I expect there are others but my feeling is that the majority may be lurkers unwilling to post. If you do decide to abandon it, would you instead consider a testing guide? Perhaps as a youtube video.
  Reply With Quote
Old 13th December 2011, 01:53 PM   #1418
diyAudio Member
 
Join Date: Nov 2011
Location: Surrey
Quote:
Originally Posted by FREDtheDOG View Post
Yes I do it very often, lock the direction of rotation against a solid block, or if I'm making something like this the end panels are small and get too hot to hold

I screw the end panels onto the case and hold the body of the case while I drill works a treat :-)

cheers
Great, thanks for that, Fredthedog. The Front Panel Express software has a print option that seems to work, to help us get the holes correctly positioned; although I had to modify the 'scale' option in the print dialog to 106.90% to get a perfect match.
  Reply With Quote
Old 13th December 2011, 02:02 PM   #1419
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
Quote:
Originally Posted by Limp View Post
FQU17P06 for Pch and the Nch says FQPF10N20C. It's what was supplied with Jokeners kit.
I have now replaced both MOSFETs and all tests seem ok. I get ~250mV on the Low Voltage Shutdown test, but there is still very loud 'pop' when I turn it on.
Thanks! Just curious about those. No ideas about the turn on pop though, unfortunately.
  Reply With Quote
Old 13th December 2011, 02:05 PM   #1420
diyAudio Member
 
Join Date: Nov 2011
Location: Surrey
Anyone got any ideas on stenciling the markings on to a diy front panel? I'm currently thinking of using a common plastic stencil with a water based pen and then covering it with shellac or laquer. I did think of permanent marker but supposedly the alcohol in the shellac would make it smear. I'm also finding that permanent marker doesn't show up too well. I suspect water-based pen will be just as bad. Perhaps acrylic paint will be necessary.
  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 04:27 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