Thank you, this is exactly the discussion I want to have. And having done so many mods to the dam 1021 (thanks to this forum) I am not afraid to do more. In case dam1021 has SW or HW limitations, or will be unstable in NOS mode, then so it be. But, I guess, we did not definitively reached this conclusion yet.
Agreed, although the upsampling algorithm definitely doesn't appear to be user-configurable.
Either way, though, the dam1021 will always be resource limited when it comes to the upsampling algorithm, as it has only the FPGA, and more importantly, has to do it in real time.
Compared to a modern PC/server, you have (essentially) infinite processing power, and also the ability to do batch offline processing. So, for example, maybe there's a sophisticated, but computationally expensive upsampling algo that takes an hour per song: probably not doable in the dam1021, but certainly doable on a general-purpose computer.
Hi Soren, could you please point in the right direction where these bypass instructions could be found.
Good points. Do you know if the dam1021 has to track the digital source rapidly or it has a significant input to output delay?
On mine, when I hit "play" I hear music instantaneously, so based on that, I assume it tracks the digital source effectively in real-time (in terms of human perception anyway).
I guess in this context (from digital processing point of view) anything in ns would be 'real time' and ms would be 'significantly delayed.
A lot of NOS ********.... The dam1021 is designed to be as clean, neutral and correct as possible. That mean no anti aliasing noise and the way to avoid that is by digital oversampling and a very simple analog filter, alternative is very heavy analog filtering, which is not a good thing, all basic DAC theory, please read up on DAC theory elsewhere.
The dam1021 is not unstable and the hardware can't be ruined when filters are bypassed in NOS mode, but people who don't understand how it work can do some crappy filters....
Some people also don't want it neutral, that fine with me, just don't blame the dam1021 when it don't have your sound, you're free to run it NOS or to add a tube buffer or output transformer, or whatever magic you believe will color the sound your way.
I also really need to do a FAQ, people keep asking the same question instead of searching the thread, most technical and basic question was discussed early in this thread.
The dam1021 is not unstable and the hardware can't be ruined when filters are bypassed in NOS mode, but people who don't understand how it work can do some crappy filters....
Some people also don't want it neutral, that fine with me, just don't blame the dam1021 when it don't have your sound, you're free to run it NOS or to add a tube buffer or output transformer, or whatever magic you believe will color the sound your way.
I also really need to do a FAQ, people keep asking the same question instead of searching the thread, most technical and basic question was discussed early in this thread.
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Sorry, I should clarify, I'm planning to power a DAM1021 and WaveIO for USB-only input so to simplify things I'm planning to use a 12V bipolar supply and two 5V supplies as the isolators on the DAM1021 can be powered with 5V, if the WaveIO non-isolated I2S output can accept this.
Or should I wait for the DAM1121? Since that accepts +-5V it should make everything simpler.
Or should I wait for the DAM1121? Since that accepts +-5V it should make everything simpler.
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For You, they are nearby🙂
DIYINHK 0.8uV Ultralow noise DAC power supply regulator +-9/12/15V 1.5A*x2
DIYINHK 4.17uV Ultralow noise DAC power supply regulator +-12/15V 1A
DIYINHK 0.8uV Ultralow noise DAC power supply regulator 3.3/5/7V 1.5A*x2
DIYINHK 4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2
DIYINHK 1.0uV Ultralow noise DAC power supply regulator 3.3V 5.0V 800mA
DIYINHK 0.8uV Ultralow noise DAC power supply regulator +-9/12/15V 1.5A*x2
DIYINHK 4.17uV Ultralow noise DAC power supply regulator +-12/15V 1A
DIYINHK 0.8uV Ultralow noise DAC power supply regulator 3.3/5/7V 1.5A*x2
DIYINHK 4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2
DIYINHK 1.0uV Ultralow noise DAC power supply regulator 3.3V 5.0V 800mA
I'm actually in the UK right now so, unfortunately, not they're not 🙁
Just changed my location to reflect that!
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That's the one I'm using for my DAM. Works great!
Just don't parallel the AC-side inputs. The PCB itself actually says not to do this. I ignored that at first. Everything was working, music playing, until... what's that smell? Smoke coming off the filter inductors on the power supply! So I killed power, let the inductors cool down, re-wired correctly, using separate transformer taps, and everything is fine. 😱
Sounds toasty
Anyways, fair enough, I'll probably fall back on those even despite the international shipping then, as I can't find anything else on the web that seems close to good enough while remaining compact. I did consider the AMB S22 until I saw just how big the PCB was...just gotta wait patiently for Soren's DAM1121 and I then can get this party started. Do need a transformer with at least 3 x 8VA taps though for +-5V on the DAM1121 and the WaveIO power; did you guys get something off the shelf or order something custom-made?
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This applies to just about anything that uses double isolated bridge rectifiers where you series the final outputs together (ground point) for a bipolar supply. There is no common ground on either of the AC inputs so when you attempt this you end up shorting things out. Done this once on my phono stage.
never seen one have so little respect for his customer 😕
as I read , you maybe a good engineer but not a nice man
bye 😉
never seen one have so little respect for his customer 😕
as I read , you maybe a good engineer but not a nice man
bye 😉
It might hurt many, but where Soeren right has he's right. Good engineers have little room for Voodoo, otherwise they would not look good. I also believe that he has enough customers that appreciate what he does. As Soeren ever said who do not like it can buy so what else. The only problem is that MSB and Co. for comparable equal € 6,000 want and the rest somehow ONLY Chip DAC's.
au contraire, SOEKRIS is a very nice man and has more patience than most earthlings.
He has been asked the same questions too many times. As he said he should have produced a FAQ for these questions but one should remember: this is not how he makes his living. This is a labor of love, a product of his audio enthusiasm and he doesn't have enough time left on earth to run his main business and to answer questions here over and over.
You should look around; there is plenty of information here and at hifarduino's blog, moredamfilers, randytsuch's blog and dimdim's blog - use a search engine to ask your questions and I bet your answers will pop up - will save you the trouble of reading every post.
If SOEKRIS was not a "nice man" there would not be a DAM dac. He will not be building a retirement account based on the sales of this DAC.
Read his previous posts and ask yourself if that sounds like a mean person?
Busy? yes. Mean? Not often enough to even register on my scale.
He has been asked the same questions too many times. As he said he should have produced a FAQ for these questions but one should remember: this is not how he makes his living. This is a labor of love, a product of his audio enthusiasm and he doesn't have enough time left on earth to run his main business and to answer questions here over and over.
You should look around; there is plenty of information here and at hifarduino's blog, moredamfilers, randytsuch's blog and dimdim's blog - use a search engine to ask your questions and I bet your answers will pop up - will save you the trouble of reading every post.
If SOEKRIS was not a "nice man" there would not be a DAM dac. He will not be building a retirement account based on the sales of this DAC.
Read his previous posts and ask yourself if that sounds like a mean person?
Busy? yes. Mean? Not often enough to even register on my scale.
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Mean? I have yet to see any personal attacks from Soren in the entirety of this thread, and he has been nothing but helpful to everyone that has questions to ask. Quite the opposite of "mean" infact.
Søren, that would be a VERY good idea with a well organised and indexed FAQ. It's easy to get lost in the more than 5000 posts in this helter-skelter thread. Would save you a lot trouble once it's done and be of great help to many users here.
I know it's hard work but you could start off easy and elaborate it over time 😉.
never seen one have so little respect for his customer 😕
as I read , you maybe a good engineer but not a nice man
bye 😉
I think almost anyone would get mad if they were asked the same questions over and over again...