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 13th December 2012, 03:40 AM   #1
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Default The DAO SE all-FET Class-A ZGF Headphone Amplifier

Following my publication of the article "Alternative Configurations of the Simple JFET Source Follower" in 2008 :
Some other Source Follower COnfigurations
and the subsequent publishing of the DAO headphone follower circuit using the Loveltech LU1014 power JFET :
MOSFET follower headphone amplifier
there has been a few private builds, as well as a few evolutions since the first circuit.

In August this year, we promised to publish an updated version with a few added features. This we now called DAO SE :
Some other Source Follower COnfigurations

More information will follow later in the next weeks, but here is a teaser first from our proto build.
It still needs cleaning and then final assembly.
The front hole will take a 5-pin Mini-XLR socket for our AK701 headphone.




Patrick
Attached Images
File Type: jpg 121212 DAO Proto 6.jpg (381.3 KB, 2314 views)
__________________
xen-audio.com
  Reply With Quote
Old 13th December 2012, 06:13 AM   #2
diyAudio Member
 
Join Date: Jan 2007
Pro work, as always, Patrick!

/subscribed
__________________
"You have a hierarchy: a mathematician, a physicist (which is a failed mathematician), and an engineer (which is a failed physicist)." - Andrew Jones
  Reply With Quote
Old 13th December 2012, 06:26 AM   #3
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Awesome work. I always love headphone amp with overbuilt chassis.

Why 5-pin though?
__________________

  Reply With Quote
Old 13th December 2012, 06:37 AM   #4
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Two channels of the DAO followers alone dissipate a total of 15W.
And I guess you do not want a headphone amp on your desk at 60C.
So the heat sink is not too over-dimensioned.

But yes, there is actually enough space to house 2 channels of LM3886 GainClone, plus a 300VA Plitron transformer.

We use a 5-pin Mini-XLR because the AK701 has a 4-wire cable (as any headphone should for best channel separation).
The 4-pin Mini-XLR has a rather asymmetrical pin layout.
Hence the 5-pin.


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 13th December 2012, 10:24 AM   #5
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
nice work Patrick! why not use the lemo 4 pin? perfectly symmetrical and would seem more in keeping with the quality of your chassis.

the switchcraft mini XLR are very good, I just find the Lemos a higher quality. pricing is a bit better than it used to be now too, since its now more widely available mouser/digikey/markertech etc
Attached Images
File Type: jpg portable BII-ES9018-Bal-Bal front_06Nov2012_1383.jpg (364.3 KB, 2098 views)
File Type: jpg portable es9018 w bal jh13_05Nov2012_1378.jpg (412.3 KB, 2036 views)
  Reply With Quote
Old 13th December 2012, 10:29 AM   #6
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Lemo for team internal use, since 2005.




Patrick
__________________
xen-audio.com
  Reply With Quote
Old 13th December 2012, 10:37 AM   #7
CeeVee is offline CeeVee  Portugal
diyAudio Member
 
CeeVee's Avatar
 
Join Date: Dec 2006
Quote:
Originally Posted by EUVL View Post
Following my publication of the article "Alternative Configurations of the Simple JFET Source Follower" in 2008 :
Some other Source Follower COnfigurations
and the subsequent publishing of the DAO headphone follower circuit using the Loveltech LU1014 power JFET :
MOSFET follower headphone amplifier
there has been a few private builds, as well as a few evolutions since the first circuit.

In August this year, we promised to publish an updated version with a few added features. This we now called DAO SE :
Some other Source Follower COnfigurations

More information will follow later in the next weeks, but here is a teaser first from our proto build.
It still needs cleaning and then final assembly.
The front hole will take a 5-pin Mini-XLR socket for our AK701 headphone.




Patrick
NICE !



Great looking work Patrick.
  Reply With Quote
Old 13th December 2012, 10:38 AM   #8
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
only 2008 for me =) I love them and use them whenever I can. i'll take a finely machined Peek/Copper/Gold connector made for Aerospace/MIL/Nuclear Science, over any 'audiophile quality' XLR made from cryoed petrified Virgins Blood of any price.

when looked at in that light the price is really not bad.
  Reply With Quote
Old 13th December 2012, 02:03 PM   #9
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Quote:
Originally Posted by EUVL View Post
Two channels of the DAO followers alone dissipate a total of 15W.
And I guess you do not want a headphone amp on your desk at 60C.
So the heat sink is not too over-dimensioned.
.. and I have a 200w electrostatic headphone amp on my desk

Can't wait for the finalized design, the AMB Beta22 is still my reference headphone amp, nothing surpasses it so far.
__________________

  Reply With Quote
Old 13th December 2012, 10:34 PM   #10
diyAudio Member
 
Join Date: Sep 2008
Location: UK
Quote:
Originally Posted by TheShaman View Post
Pro work, as always, Patrick!

/subscribed
Indeed!
__________________
Will
  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
Midgard, a low distortion Lateral FET output Headphone Amplifier Neutrality Headphone Systems 8 14th December 2012 07:31 PM
Thor, an all discrete Lateral FET Headphone Amplifier. Neutrality Headphone Systems 163 5th November 2012 02:53 PM
WTB: DAO follower headphone amp board/parts/kit/complete korchha Swap Meet 4 5th November 2012 03:37 AM
Mjlner, another all discrete Lateral FET Headphone Amplifier Neutrality Headphone Systems 13 13th October 2012 07:42 PM
DAO Follower vs F3 Headphone Amp Melon Head Headphone Systems 13 10th November 2009 05:45 PM


New To Site? Need Help?

All times are GMT. The time now is 03:54 AM.


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