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-   -   The DAO SE all-FET Class-A ZGF Headphone Amplifier (http://www.diyaudio.com/forums/headphone-systems/225577-dao-se-all-fet-class-zgf-headphone-amplifier.html)

EUVL 13th December 2012 03:40 AM

The DAO SE all-FET Class-A ZGF Headphone Amplifier
 
1 Attachment(s)
Following my publication of the article "Alternative Configurations of the Simple JFET Source Follower" in 2008 :
http://www.diyaudio.com/forums/pass-...gurations.html
and the subsequent publishing of the DAO headphone follower circuit using the Loveltech LU1014 power JFET :
http://www.diyaudio.com/forums/headp...ml#post1130743
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 :
http://www.diyaudio.com/forums/pass-...ml#post3126245

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

TheShaman 13th December 2012 06:13 AM

Pro work, as always, Patrick!

/subscribed

Lil Knight 13th December 2012 06:26 AM

Awesome work. I always love headphone amp with overbuilt chassis.

Why 5-pin though?

EUVL 13th December 2012 06:37 AM

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

qusp 13th December 2012 10:24 AM

2 Attachment(s)
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

EUVL 13th December 2012 10:29 AM

Lemo for team internal use, since 2005.

:)


Patrick

CeeVee 13th December 2012 10:37 AM

Quote:

Originally Posted by EUVL (Post 3282649)
Following my publication of the article "Alternative Configurations of the Simple JFET Source Follower" in 2008 :
http://www.diyaudio.com/forums/pass-...gurations.html
and the subsequent publishing of the DAO headphone follower circuit using the Loveltech LU1014 power JFET :
http://www.diyaudio.com/forums/headp...ml#post1130743
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 :
http://www.diyaudio.com/forums/pass-...ml#post3126245

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 !

:D:D

Great looking work Patrick.

qusp 13th December 2012 10:38 AM

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.

Lil Knight 13th December 2012 02:03 PM

Quote:

Originally Posted by EUVL (Post 3282740)
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 :p

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

Woodenhead 13th December 2012 10:34 PM

Quote:

Originally Posted by TheShaman (Post 3282723)
Pro work, as always, Patrick!

/subscribed

Indeed!


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