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The DAO SE all-FET Class-A ZGF Headphone Amplifier
The DAO SE all-FET Class-A ZGF Headphone Amplifier
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Old 20th May 2017, 07:58 AM   #321
Stixx is offline Stixx  Germany
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Location: Southern Germany
Quote:
The project is still in phase 1 a.t.m. ?
Hi Davor,
yes, the project is still going on...
You know my email in case you have questions.
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Old 8th July 2017, 08:14 AM   #322
donovas is offline donovas  South Korea
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Hi patrick, after my experience with your f5ha, i am keen on building this circuit. No doubt it will be jaw droppingly good as your other headphone amp has proven to be. But its hard for me to source the power jfet here. Ill order them overseas. Is there any alternative i can use meanwhile? I will take the trade off is sq if i can get it working asap woth found parts. And how hot does 1014 get? Is it possible to heatsink it by soldering it on the pcb?

Thank you in advance
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Old 8th July 2017, 12:32 PM   #323
EUVL is offline EUVL  Europe
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You can get sort-of-matched LU1014 here :
LU1014D JFET's
Buy a bunch and then fine match them yourself.

If you want to build the DAO with perfect devices then best to wait for batch 2.


Patrick
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Old 11th August 2017, 08:39 PM   #324
Green Marlin is offline Green Marlin  Italy
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Hi when batch 2 ?
Sergio
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Old 11th August 2017, 08:49 PM   #325
EUVL is offline EUVL  Europe
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When Batch 1 has finished building.


Patrick
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Old 26th January 2018, 02:28 PM   #326
dabore84 is online now dabore84  Netherlands
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The DAO SE all-FET Class-A ZGF Headphone Amplifier
I'm here to sprinkle some stardust in 2018 for an amp that I (and many others) highly anticipate. And hope for an update, even an indefinitely small one

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Old 26th January 2018, 02:58 PM   #327
EUVL is offline EUVL  Europe
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If the question is whether there will be a batch 2, then I guess earliest Nov. 2018, if at all.
And it depends on how many subscribers with the required skills.

As far as I know none of the batch 1 subscribers is close to finish.
Probably most of them are still awaiting a custom designed case by one of the subscribers.
A design that I would be proud of.
When it is finished it will certainly be one of the most desirable headphone amps one can build or buy.

But of course anyone else trying to sell anything will say the same.
So I better leave you to judge for yourself, whenever someone from GB1 is ready to show it off and tell you how it sounds.



A second prototype of the balanced version is being built by another skilled DIY'er, and demonstrates extremely low distortion.
-110dB 3rd harmonics at 1Vrms 1kHz into 50R load.
2nd harmonics is -130dB, demonstrating excellent device matching.
Noise floor is below -130dBV broadband, and 50Hz harmonics are all below -120dBV.
Remember that this is all ZGF (zero global negative feedback).


Patrick
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Old 27th January 2018, 11:04 AM   #328
Morde is offline Morde  Finland
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I would surely like to sign for the DAO since I have almost finished the PSL.
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My finished headphone amp projects: 1, 2, 3, 4, 5, 6, 7
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Old 27th January 2018, 11:14 AM   #329
EUVL is offline EUVL  Europe
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Two more headphone amp projects are planned for this year, before any DAO GB2.
One already finished, awaiting auditioning.
So don't throw away your Toshiba BJTs.




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Old 20th February 2018, 04:47 PM   #330
EUVL is offline EUVL  Europe
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I have been asked by PM today about PCBs, documents and Gerber files for the DAO SE.

First of all thank you for your interest.

We have PCBs in stock, but have no time to sort and ship them for individual requests.
Also it is not just about a set of PCBs, but also about the building support required, especially for the DAO.
So we only want to support a second batch properly when we are finished with the first batch.
I think none of them is any where near finishing, which is why I said November in post #327.

As to incomplete documentation, all subscribers will eventually receive a complete set.
But if you are skilled in circuitry, you can essentially find everything required for a 1:1 build here and at the F5-HA and SHPP threads (e.g. for the cross feed).
F5 Headamp ?
XEN SHPP -- Simple Headphone Protection

And we will not publish our Gerber files, now or in the foreseeable future.


Our apologies for not being more forthcoming,
Patrick
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