Just finished the new motherboard and want to know if I can test it without the Rload resistors. I have the Shinko tantalums on my old (red) motherboard (still in use), and the plan is to use them one the new board.
What is the perfect V out for this new motherboard with the Tent clock ?
Is there any ground issues to concider ? I was thinking of using a simple 12v, 1.5A psu stright from the wall.
If everything seems fine it`s just to move over the 4 dac boards from the old (red) mother board. Anyone ?
What is the perfect V out for this new motherboard with the Tent clock ?
Is there any ground issues to concider ? I was thinking of using a simple 12v, 1.5A psu stright from the wall.
If everything seems fine it`s just to move over the 4 dac boards from the old (red) mother board. Anyone ?
You MUST have the roads installed, otherwise the chips will no be biased, hence no music. Why not use simple resistors for quick test. Use 100 and 33 ohm in series. These are standard values
Normally there are no earth issues, just try and most likely it will be quiet
Not sure what you mean with perfect v out ?
Normally there are no earth issues, just try and most likely it will be quiet
Not sure what you mean with perfect v out ?
Doede@
Maybe you misunderstand what I ask for. I want to put 12v on the mother board WITHOUT dac boards. Just to make sure it's ok. Still nessessary with Rload resistors?
(Ps: forget "perfect v out" )
Maybe you misunderstand what I ask for. I want to put 12v on the mother board WITHOUT dac boards. Just to make sure it's ok. Still nessessary with Rload resistors?
(Ps: forget "perfect v out" )
Moved the blue mainbord over to dddac and connected the 4 deck and everything works fine.
Thx
Thx
Curiosity killed the cat
Hello,
Just wondering where are the owners of the new improved dddac?
Me, I am just waiting for my Sowters to arrive. Something did go wrong with the parcel so I have to be a little more patient.
Gives me time to test my power supply with a BIG load resistor that will give similar current draw as my 4 deck dddac. Did remove some resistors from an industrial welding machine.
Greetings, Eduard
Hello,
Just wondering where are the owners of the new improved dddac?
Me, I am just waiting for my Sowters to arrive. Something did go wrong with the parcel so I have to be a little more patient.
Gives me time to test my power supply with a BIG load resistor that will give similar current draw as my 4 deck dddac. Did remove some resistors from an industrial welding machine.
Greetings, Eduard
Help !
I have noise when adjusting volume after installing the new blue board. It sounds like small clics. This was not an issue with the old red board. What's wrong here ?
A friend of mine also have the same problem. He has just finished his dddac with the new dac boards.
Thx
I have noise when adjusting volume after installing the new blue board. It sounds like small clics. This was not an issue with the old red board. What's wrong here ?
A friend of mine also have the same problem. He has just finished his dddac with the new dac boards.
Thx
Hello Simon,
I know you have them. I have them too but waiting for Sowters.
Still busy making the LCLC power suppply. Probably will have it working tonight.
Maybe will post some pics later in my adventures in dddac land thread
Wait for Doede to solve your problem Mister smooth dancer.
Greetings, Eduard
I know you have them. I have them too but waiting for Sowters.
Still busy making the LCLC power suppply. Probably will have it working tonight.
Maybe will post some pics later in my adventures in dddac land thread
Wait for Doede to solve your problem Mister smooth dancer.
Greetings, Eduard
One general point when people ask for help: Be as precise and descriptive as possible on the situation. It is hard to do remote diagnoses, so help your self by adding as much as possible. Take the below questions as a guide what I mean with that
small clicks when adjusting volume. Is this in the audio-player (digital volume or on the pre-amplifier (volume analog)? Is it a normal Potentiometer or is it a ladder switch?
Small clicks normally directs into small DC changes when NOT using a DC blocker like capacitors or transformers.
Is it ONLY when you adjust Volume or also in between when playing music?
What about the noise? You mean only the clicks or noise as in Audio NOISE, white, digital or pink noise?
How is the XLR connected? Only POS and NEG to 2/3? Or also the common to 1 (should not be the case by the way...)
Please check so I (we) can have a better insight on where to look.
thanks
Hi Doede !
Here is the "story"; I have only replaced the red mother board with the new blue one. The dac boards are the first version without the Tent shunt regs.
I have been playing without no issues for over a year with the old (red) mother board.
My dac has 4 deck, and on top of the last deck ( between A-pos B-pos, and A-neg B-neg) is 4 caps for filtering quantization noise.
The xlr is connected ONLY pos and neg.
It is the same analog pre amp (with potmeter) that is used for adjusting the volume.
It clics or pops ONLY when adjusting the volume knob on the pre amp. It's no difference if I play music or not.
I think I will call it audio noise. The dac is silent and very good sounding.
My hope is to avoid the capasitors on output. I have not tried caps, but I have tried the Cinemags, and they make the sound not so clear and dynamic.
In my humble opinion there must be something with the new blue board that is causing this noise on output. The red board don't.
I have change absolute nothing else than swapping the red with the blue mother board.
The only reason for replace the red with the blue mother board is the possibility of use s/pdif when playing consert blurays on a HD projector on a 106" large screen.
A friend of mine have the latest version of the dddac, and he have the same clics/pops as me. He use no caps or transformers on output. He was so impressed after hearing my dddac that he sold his Buffalo.
Hope this info will help Doede.
Thx in advance.
Here is the "story"; I have only replaced the red mother board with the new blue one. The dac boards are the first version without the Tent shunt regs.
I have been playing without no issues for over a year with the old (red) mother board.
My dac has 4 deck, and on top of the last deck ( between A-pos B-pos, and A-neg B-neg) is 4 caps for filtering quantization noise.
The xlr is connected ONLY pos and neg.
It is the same analog pre amp (with potmeter) that is used for adjusting the volume.
It clics or pops ONLY when adjusting the volume knob on the pre amp. It's no difference if I play music or not.
I think I will call it audio noise. The dac is silent and very good sounding.
My hope is to avoid the capasitors on output. I have not tried caps, but I have tried the Cinemags, and they make the sound not so clear and dynamic.
In my humble opinion there must be something with the new blue board that is causing this noise on output. The red board don't.
I have change absolute nothing else than swapping the red with the blue mother board.
The only reason for replace the red with the blue mother board is the possibility of use s/pdif when playing consert blurays on a HD projector on a 106" large screen.
A friend of mine have the latest version of the dddac, and he have the same clics/pops as me. He use no caps or transformers on output. He was so impressed after hearing my dddac that he sold his Buffalo.
Hope this info will help Doede.
Thx in advance.
Last edited:
Measured for dc between pos -neg on xlr out, right channel; 0.011 mv dc
left channel; 0.004 mv dc
This is without caps or transformers.
left channel; 0.004 mv dc
This is without caps or transformers.
It seems that I have solved the problem with noise.
I replace the four vishay mkp 1837 (15nf each), sitting on top of the 4 decs, with two vishay mkp 1837 100 nf, on the mother board.
So in my dac 4x15nf was not enough.
I replace the four vishay mkp 1837 (15nf each), sitting on top of the 4 decs, with two vishay mkp 1837 100 nf, on the mother board.
So in my dac 4x15nf was not enough.
Hello,
Maybe these 2 caps need to be on the motherboard? On the small boards i dont see them indicated.
Why your dac would need them and someone elses dac wouldnt care if they are there or not?
I have loads of caps so i am sure there are 22nF or pretty close among them. I might even have some silver mica which seems to be pretty good for that purpose if i remember well.
If i have time tomorrow i will make a support for the output caps of my power supply. They will be close to were the 12 volts enter the circuit board.
Because i am using both chokes in what Lundahl calls common mode but what is in fact differential mode i know that what Doede calls the central groundpoint will be at the '' exit '' of the coil which interconnects the negative poles of the power capacitors. The '' exit '' will be pretty close to the last cap and that will be even closer to the circuit.
There will be no connection between this point and the metal chassis?
What about the electrostatic screen of the r core power transformer connect is to the chassis or to the earth lug on the iec input
I know the input and output both are isolated from the chassis.
Greetings, Eduard
Maybe these 2 caps need to be on the motherboard? On the small boards i dont see them indicated.
Why your dac would need them and someone elses dac wouldnt care if they are there or not?
I have loads of caps so i am sure there are 22nF or pretty close among them. I might even have some silver mica which seems to be pretty good for that purpose if i remember well.
If i have time tomorrow i will make a support for the output caps of my power supply. They will be close to were the 12 volts enter the circuit board.
Because i am using both chokes in what Lundahl calls common mode but what is in fact differential mode i know that what Doede calls the central groundpoint will be at the '' exit '' of the coil which interconnects the negative poles of the power capacitors. The '' exit '' will be pretty close to the last cap and that will be even closer to the circuit.
There will be no connection between this point and the metal chassis?
What about the electrostatic screen of the r core power transformer connect is to the chassis or to the earth lug on the iec input
I know the input and output both are isolated from the chassis.
Greetings, Eduard
Eduard@
The two vishay 100nf caps is on the mother board where it's indicated. The four 15nf caps I removed was sitting on top of the four dac boards
The two vishay 100nf caps is on the mother board where it's indicated. The four 15nf caps I removed was sitting on top of the four dac boards
Hello,
No energy you start soldering after a hard day of labour. Only did mount a new piece of metal to get the power caps closer to the 12 volt input terminal.
Can move the motherboard around on its mounting plate but I think they are much closer than all the other pictures I have seen here.
Miser smooth dancer I guess there will be an optimum spot to mount the caps that will stop these strange noise you had.
Greetings, eduard
No energy you start soldering after a hard day of labour. Only did mount a new piece of metal to get the power caps closer to the 12 volt input terminal.
Can move the motherboard around on its mounting plate but I think they are much closer than all the other pictures I have seen here.
Miser smooth dancer I guess there will be an optimum spot to mount the caps that will stop these strange noise you had.
Greetings, eduard
Attachments
Eduard@
Nice work. You can look forward to hear your dddac.
The new mother board is designed with an option for filtering caps like the ones i have mounted. It solved my problem.
Nice work. You can look forward to hear your dddac.
The new mother board is designed with an option for filtering caps like the ones i have mounted. It solved my problem.
You guys asked if anyone had built it yet. Actually several, but not everyone is on this forum (sometimes for language issues). But I did get a nice mail from Cesare Dini who has a 4 deck Powered By Tent version as one of the first...
It made me
to be honest
here is his feedback... 😎
tried DDDAC with friends during all weekend and all we were shocked! incredible feeling of freedom and musicality.
All instruments with the right tone, the voice like singer or singer were just ahead.
Never have I felt such a quality sound in all registers, the best coffee possible and treble which spin like silk.
Thank you and I know that soon I will have four additional deck. It is rare to find such musical balance.
A flute or Carmina Burana, even fun, even evidence. None of the other DAC for comparison could not keep this quality, this depth and such elegance.
Thank you for such a joy to Doede, bravo and congratulations friends,
By the way, there are more Testimonies here: - Link to website DDDAC testimonies -
It made me
to be honesthere is his feedback... 😎
tried DDDAC with friends during all weekend and all we were shocked! incredible feeling of freedom and musicality.
All instruments with the right tone, the voice like singer or singer were just ahead.
Never have I felt such a quality sound in all registers, the best coffee possible and treble which spin like silk.
Thank you and I know that soon I will have four additional deck. It is rare to find such musical balance.
A flute or Carmina Burana, even fun, even evidence. None of the other DAC for comparison could not keep this quality, this depth and such elegance.
Thank you for such a joy to Doede, bravo and congratulations friends,
By the way, there are more Testimonies here: - Link to website DDDAC testimonies -
Hello,
Once one more are sold messages will keep dropping in. You can see messages are read but few people willing to share their experience so far.
Happily Doede can answer most questions.
I hope before the end of the month mine will be working.
Greetings, eduard
Once one more are sold messages will keep dropping in. You can see messages are read but few people willing to share their experience so far.
Happily Doede can answer most questions.
I hope before the end of the month mine will be working.
Greetings, eduard
Hello Doede,
I'm recently building your new dddac in a 8 deck version.
Question; why is R5 (4R7) necessary on the dac-board and what can go wrong when I'm bypassing it?
Bye, Hans
I'm recently building your new dddac in a 8 deck version.
Question; why is R5 (4R7) necessary on the dac-board and what can go wrong when I'm bypassing it?
Bye, Hans