Isolated "ground" ---> Hmmm. What's that? Sorry for nagging, but seems a bit confusing. I thought you suggested NOT to connect the 5V PSU for the Wave IO to GND. Wouldn't it be better to show both POS and NEG wires between the PSU and the Wave IO, and add a note indicating this as floating from GND?
The 5 volt (for WaveIO) GND should not be connected to the DAC GND, that is correct. So it is isolated from the rest of the system. The DAC GND can be connected to the Chassis ground, which again can be connected to safety earth. I thought that was clear in the mean time.
I will take your suggestion for the next update. also maybe draw a functional block indicating the power and Signal flow together with their "grounds"
I will take your suggestion for the next update. also maybe draw a functional block indicating the power and Signal flow together with their "grounds"
I have been doing my signal flow and grounding (earth, ground, common, whatever...) scheme and I believe it is pretty clear now how it is done and to my opinion should be done.
If you look at it, you will see, that the signal flow is shielded and that there are no ground loops possible. Still all equipment has a safety earth to avoid hazard or schock when something goes wrong (meaning, life mains short to chassis...)
I believe this can be used also as general info for other individual situations.
Hope this helps. Here is a direct link to PDF
If you look at it, you will see, that the signal flow is shielded and that there are no ground loops possible. Still all equipment has a safety earth to avoid hazard or schock when something goes wrong (meaning, life mains short to chassis...)
I believe this can be used also as general info for other individual situations.
Hope this helps. Here is a direct link to PDF
This is much clearer, thanks Doede!
- What are the yellow boxes? The chassis?
- What is the meaning / purpose of the COM1, COM2, COM3 and COM4 symbols? How are they "local"? I believe these symbols could just be deleted without loosing any information -- correct?
- Is your tube amp electronics really not connected to the chassis?
thanks 🙂
- Each yellow box is a chassis, hence the safety ground (earth) connected to each one of them
- In every box electronic commons are tied together, but as you stated earlier, if I use one unique symbol on one page, you assumed they were tied together, hence I numbered them to show they are not unique. So common 1 means that only in that local circuit the commons (also called ground) are tied together, but between common 1 and common 2 for example there is no electrical connection.
- As you see in the circuitdiagram, the line amp electronics is connected to the chassis. The main amp is not. the electronics is floating. only (for safety) the chassis is connected to safety ground (earth)
Hi, I just want to see if someone has anything to say about the following .
Some people argue that a DAC sounds better if there is no oversampling and without an analog filter. When it comes to subjective matters I'm willing to accept most things but there is one thing about this issue.
Almost every recording is made in a digital studio and there is probably a lot of transformations and up/down samplings and other digital manipulations. So how can it harm to have a DAC that uses FIR-filters to make the output more smooth?
Personally, I have built myself a DAC some 15 years ago with the PCM1704. I'm a little curious to test how a modification could perhaps "improve" the subjective impression.
But there is some work to be done, and I think the idea is so... well strange, that I,m not really willing to give it a try. I mean, on other parts of this forum people are building amps that distorts 0.0001%, and here we are talking about a DAC with around 50% distortion at 10khz
The modification, though, should be quite easy - I have a DSP that feeds the DAC and the software could easily be changed.
But, I'm a curious guy - do you have anything to encourage me with?
Some people argue that a DAC sounds better if there is no oversampling and without an analog filter. When it comes to subjective matters I'm willing to accept most things but there is one thing about this issue.
Almost every recording is made in a digital studio and there is probably a lot of transformations and up/down samplings and other digital manipulations. So how can it harm to have a DAC that uses FIR-filters to make the output more smooth?
Personally, I have built myself a DAC some 15 years ago with the PCM1704. I'm a little curious to test how a modification could perhaps "improve" the subjective impression.
But there is some work to be done, and I think the idea is so... well strange, that I,m not really willing to give it a try. I mean, on other parts of this forum people are building amps that distorts 0.0001%, and here we are talking about a DAC with around 50% distortion at 10khz
The modification, though, should be quite easy - I have a DSP that feeds the DAC and the software could easily be changed.
But, I'm a curious guy - do you have anything to encourage me with?
To be honest, this discussion is probably in a hundred threads world wide 😉
I think is enough OFF topic, that I would like to ask to not have many posts on this subject. The facts talk, people like the concept and they actually tried and listened to it and got sold... It is easy, just try for your self and decide for your self. No hard feelings 😀
Oh my god, this must be the most ON topic you could imagine!
I'm an open minded guy and I'm seriously interested in why this concept seems to work from a subjective point of view.
It's like going to some religious meeting and ask something like this: "Why should I believe that J****s is the son of G*d"?
Everyone looks at me and tells me: " Well my son, you will just have to believe - don't ask any questions about G*d, that's so off topic".
Anyhow, I will probably test the thing. I'll be back to tell everyone if I will see the light.
I'm an open minded guy and I'm seriously interested in why this concept seems to work from a subjective point of view.
It's like going to some religious meeting and ask something like this: "Why should I believe that J****s is the son of G*d"?
Everyone looks at me and tells me: " Well my son, you will just have to believe - don't ask any questions about G*d, that's so off topic".
Anyhow, I will probably test the thing. I'll be back to tell everyone if I will see the light.
Oh Please STOP Svitjod. Nothing to do with religion. Just happy DIY'er 9and sometimes not happy diy). As Doede stated this is the place to discuss technically about the DDDAC. For discussion about NOS or other DAC's there are other forums.
Loving this DAC! Just a question regarding power supply.... I am powering a 4 deck with sjostroms super regulator. However a lot of people seem to be using a choke design with lundhals. What is the advantage of this?
I'm not an expert but the only thing I could think is that a super regulator gives a constant voltage regardless of load. However,if using a ccs on the DAC, this gives no advantage as its both voltage and current are constant, not allowing the DAC to swing as much on transients? Is it that the choke design keeps the current constant, but allows the DAC to swing the voltage as needed?
I'm interested as I'd like to learn, but also I'd like to give it a try. However, the lundhals aren't cheap and I'd like to understand what difference it would make before doing it!
I'm not an expert but the only thing I could think is that a super regulator gives a constant voltage regardless of load. However,if using a ccs on the DAC, this gives no advantage as its both voltage and current are constant, not allowing the DAC to swing as much on transients? Is it that the choke design keeps the current constant, but allows the DAC to swing the voltage as needed?
I'm interested as I'd like to learn, but also I'd like to give it a try. However, the lundhals aren't cheap and I'd like to understand what difference it would make before doing it!
That's not how it works. You might be better off to think of the DAC as a valve that modulates the voltage provided by the power supply, where the modulation is the audio signal. Modulating a clean PSU voltage gives as clean audio signal at the output 🙂
Hi mbrennwa, thanks for the info (like I said, I am most certainly no where near an expert in this). But using the logic above, surely a super regulator would be much better (as long as its good) as it will have the cleanest PSU voltage to modulate in to the AC audio signal? So when a super regulator PSU is cheaper and more compact, why would people spend so much effort in implementing choke supplies?
Hello,
Can anyone please tell me what is the exact power consumation of one 8V Tent shunt?
Thank you !
Can anyone please tell me what is the exact power consumation of one 8V Tent shunt?
Thank you !
Consider choke power supply as a manis' (110/120 230/240) filter... In DDDAC, the voltage regulators are still there. Tent shunt could be considered to be a super regulator.
Thank you very much Alex !
Unfortunately now I am even more confuse 🙂 Doede said that one DAC board with onboard Tent shunts will have a power consumation of ~200mA
Hi Stefan,
The measurement was the total consumption including the main board so the extra 20ma would be used up by the main board so you should be OK 🙂
Now I understand 🙂 My question was only for one Tent shunt, not for the whole board. I will power the digital and analog from separate power supply and I want to know the power consumation of the 8V version shunt to desing the analog power supply corectly.