There is a gazillion of PSUs like this out there, and they all work perfectly fine. I don't see your point. Let's just leave it there.
A few people still not entered their last time buy order. Shop WILL close definitively September 21st...
In case you want have last minute decided to order one or more DAC boards, you can do so, even without the pre-subscriptiuon.
Direct Link to SHOP
In case you want have last minute decided to order one or more DAC boards, you can do so, even without the pre-subscriptiuon.
Direct Link to SHOP
MERRY CHRISTMAS TO ALL DDDAC FANS!
Christmas BLOG Post
warm regards
doede
PS:
The image is created with BING Image Creator. For stuff like that AI is a nice tool.
AI in audio design? well, I tried a few times and there is a long way to go 😉
I will stick for the near future to creating nice pictures. (My granddaughter loves them 🙂 )
Hi DD,
I am doing as you said. Ordered the psu from Audio-Creative. Ordered a 105VA trafo. Looking for a 1H/1A choke now. Looking forward to the build.
Hello,
1H 1A can be found but will be big and not cheap. The Lundahl LL 2771 can be ordered to have 1,5H 1A with the two coils in parallel but dcr would be around 2,8 ohm. Maybe to much voltage drop will be there to keep the regulation circuit working properly. Maybe you will low voltage drop diodes to compensate for this.
And the LL2771 is big. Maybe go for the little brother and accept lower mH . Not sure if the regulator circuit would need more than 1 H
If no regulator circuit present more mH surely has avantages.
Of course if you don't try you will not know.
Greetings Eduard
1H 1A can be found but will be big and not cheap. The Lundahl LL 2771 can be ordered to have 1,5H 1A with the two coils in parallel but dcr would be around 2,8 ohm. Maybe to much voltage drop will be there to keep the regulation circuit working properly. Maybe you will low voltage drop diodes to compensate for this.
And the LL2771 is big. Maybe go for the little brother and accept lower mH . Not sure if the regulator circuit would need more than 1 H
If no regulator circuit present more mH surely has avantages.
Of course if you don't try you will not know.
Greetings Eduard
Sure, i got that. The reason i say 1H/1A is because in DD’s blog post, he plotted the graphs with 3 chokes and the noise rejection was the best with the 1H/1A choke. Hence, i wanted to aim for the same. Hope that will give me the best results, of course also upsizing the cap to 22,000uf as well.
Say if this 1H choke has a dcr of 6ohms, what and how do I need to alter in the recipe that DD suggested? Maybe if @eduard or anyone else can hand draw a schematic for me so a noob like me can follow to the T.
Thanks
Say if this 1H choke has a dcr of 6ohms, what and how do I need to alter in the recipe that DD suggested? Maybe if @eduard or anyone else can hand draw a schematic for me so a noob like me can follow to the T.
Thanks
Hello,
The ll2771 wIth two coils in parallel will be 2,8 ohm so compared to Hammond 0,7 ohm plus 1 ohm resistor you will have 1,1 ohm extra so let us say with 4 boards one volt extra voltage drop.
A bigger transformer will give you a little higher output so will the diodes. So 2,8 ohm no problem
BUT do you have space for the LL2771. First check this out.
Greetings Eduard
The ll2771 wIth two coils in parallel will be 2,8 ohm so compared to Hammond 0,7 ohm plus 1 ohm resistor you will have 1,1 ohm extra so let us say with 4 boards one volt extra voltage drop.
A bigger transformer will give you a little higher output so will the diodes. So 2,8 ohm no problem
BUT do you have space for the LL2771. First check this out.
Greetings Eduard
Space is no constraint. My dac is on a bamboo board so i can fit anything. Most likely i wont get any lundahl choke due to availability concerns in my country. I can have a custom choke wound for me and the winder indicated around 5-6ohms dcr. What do i need to do different with the audio creative supply mods that DD suggested to get the correct 12v/1a output from the supply for the dddac?
Hello,
It will be no different than using any other choke but 5 to 6 ohm will give a much bigger voltage drop than a 2,8 ohm Lundahl which you can get worldwide. With 5..6 ohm you will surely need another power transformer.
I would go for the Lundahl.
I use a few and i know there are others too.
Greetings Eduard
It will be no different than using any other choke but 5 to 6 ohm will give a much bigger voltage drop than a 2,8 ohm Lundahl which you can get worldwide. With 5..6 ohm you will surely need another power transformer.
I would go for the Lundahl.
I use a few and i know there are others too.
Greetings Eduard
Hello,
Doede can surely answer this but it will be very hard to reduce the current draw 50% and still maintain a shunt supply. Maybe keeping the shunts will make the boards to big or generate to much heat or making them to expensive.
We will see in a few months probably.
Maybe the boards will offer less possibility for improvement because using more smd parts?
Greetings,Eduard
Doede can surely answer this but it will be very hard to reduce the current draw 50% and still maintain a shunt supply. Maybe keeping the shunts will make the boards to big or generate to much heat or making them to expensive.
We will see in a few months probably.
Maybe the boards will offer less possibility for improvement because using more smd parts?
Greetings,Eduard