The weird thing...
To me is that we can see actual measurements of jitter with DACs based on the Spartan 6 in Sstereophile tests, and the actual measured jitter is often < a couple of hundred pS? How does this add up....
To me is that we can see actual measurements of jitter with DACs based on the Spartan 6 in Sstereophile tests, and the actual measured jitter is often < a couple of hundred pS? How does this add up....
I think we can agree on that there are going to be some random clock jitter in any DAC, no matter how clean the clock is.
I have done what's possible inside my design parameters to keep it down in my R-2R.
But the good thing about a R-2R DAC is that random jitter just result in more noise, no strange modulation or noise shaping side effects....
I have done what's possible inside my design parameters to keep it down in my R-2R.
But the good thing about a R-2R DAC is that random jitter just result in more noise, no strange modulation or noise shaping side effects....
Real measurements would tell (D-Jitter, impulse response)...
and finally real listening test to name then as a Reference and not earlier
D-Jitter tests would tell/show about strange modulation
just my 2 cents
Hp
Hi Dimdim! That would be great! His TFT based hifiduino solution is great, I have one... Sorry for the OT post.
I guess the first few hundred are reserved for the ones who sent a PM to Soren... as requested by him
I had send a PM. I tried to order (as soon I noticed the DAC was listed at the online shop) but can not proceed to the end of the order process.
You cannot proceed because it says "out of stock"... It is a bit frustrating to not know if you are on the list, I sent a PM too, several actually but no reply, not that I was expecting an answer as he specifically said there will be no confirmation. I expressed interest among the first ten, it would be nice to know how people will be informed so they do not miss an email in the spam filter or a PM here,Soeren, please give us a clue...
Ok, time for an update:
Yes, I know things are delayed, as usually things takes more time as hoped for, a little complicated with both the hardware design, production preparing, uC programming in C and FPGA designing in VHDL. Could wish for better tools with less bugs....
I do have the first assembled 240 production boards here ready to be tested, but need to finish up firmware before we can test and start shipping. The whole firmware is progressing pretty good, only need to get the filters in order. I have the SPDIF receiver working up to 96 Khz, automatically detecting clock and locking, the I2S interface need to be tested, but is pretty simple.
I have music playing and it sounds great, very clear, no strange side effects or noise, in fact NO noise at all into my HD-650's.... But I might be biased.
Ordering:
The webshops are preparing to take orders, so please wait for me to say anything before trying to order. Once I say the go (watch for first posting being updated), everybody can place orders, but they will be processed in priority based on a large spreadsheet where everybody who have expressed interest are listed sorted on date.
I know several people have asked for me to contact them when ready to ship, but I'm sorry, there are just too many on the interest list for me to contact everyone directly.
Final prices has been been set, the 0.02% and 0.01% versions ended up cheaper in USD but the USD/EUR exchange rate changes has made the EUR pricing a little higher.
As the first batch was delayed, the next batch of 360 boards will actually come pretty soon after, parts are here and production of those is scheduled to start on Jan 5, 2015.... There should then be enough boards for everybody expressing interest.
I will then see how things goes and hopefully start more production lots....
Docs:
There will also be a draft manual when orders start to ship, and features will be continue to be added as I decide to implement them. The complete firmware can be updated using a simple serial port, no special hardware or software needed.
Yes, I know things are delayed, as usually things takes more time as hoped for, a little complicated with both the hardware design, production preparing, uC programming in C and FPGA designing in VHDL. Could wish for better tools with less bugs....
I do have the first assembled 240 production boards here ready to be tested, but need to finish up firmware before we can test and start shipping. The whole firmware is progressing pretty good, only need to get the filters in order. I have the SPDIF receiver working up to 96 Khz, automatically detecting clock and locking, the I2S interface need to be tested, but is pretty simple.
I have music playing and it sounds great, very clear, no strange side effects or noise, in fact NO noise at all into my HD-650's.... But I might be biased
.Ordering:
The webshops are preparing to take orders, so please wait for me to say anything before trying to order. Once I say the go (watch for first posting being updated), everybody can place orders, but they will be processed in priority based on a large spreadsheet where everybody who have expressed interest are listed sorted on date.
I know several people have asked for me to contact them when ready to ship, but I'm sorry, there are just too many on the interest list for me to contact everyone directly.
Final prices has been been set, the 0.02% and 0.01% versions ended up cheaper in USD but the USD/EUR exchange rate changes has made the EUR pricing a little higher.
As the first batch was delayed, the next batch of 360 boards will actually come pretty soon after, parts are here and production of those is scheduled to start on Jan 5, 2015.... There should then be enough boards for everybody expressing interest.
I will then see how things goes and hopefully start more production lots....
Docs:
There will also be a draft manual when orders start to ship, and features will be continue to be added as I decide to implement them. The complete firmware can be updated using a simple serial port, no special hardware or software needed.
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Forgot to say:
Based on my spreadsheet, everybody expressing interest for:
0.01% version before Oct 20 can get from first batch.
0.02% version before Nov 1 can get from first batch.
0.05% version anybody can get from first batch.
??? Yes, there are some who didn't specify, I have reserved a few for those....
And that goes for posting here or in private messages, I do receive them all. And should I have missed something next batch is here soon....
Based on my spreadsheet, everybody expressing interest for:
0.01% version before Oct 20 can get from first batch.
0.02% version before Nov 1 can get from first batch.
0.05% version anybody can get from first batch.
??? Yes, there are some who didn't specify, I have reserved a few for those....
And that goes for posting here or in private messages, I do receive them all. And should I have missed something next batch is here soon....
Søren: Thank you for the update. That is all fantastic news!
I noticed that your R2R DAC module is listed only on your European web site, and not on the USA site. Adding one into the cart then shows shipping to USA of about 85 Euros ($105). That is VERY expensive for shipping a small board. I sell a small board product (a DC-conversion/Linear Fan Controller Kit for Apple Mac minis) and ship them all over the world via post for $23. Even a big 7kg box I can ship anywhere for less than $90.
So please consider either shipment from your California office or offering delivery via postal service.
Happy New Year!
Alex C.
UpTone Audio LLC
I noticed that your R2R DAC module is listed only on your European web site, and not on the USA site. Adding one into the cart then shows shipping to USA of about 85 Euros ($105). That is VERY expensive for shipping a small board. I sell a small board product (a DC-conversion/Linear Fan Controller Kit for Apple Mac minis) and ship them all over the world via post for $23. Even a big 7kg box I can ship anywhere for less than $90.
So please consider either shipment from your California office or offering delivery via postal service.
Happy New Year!
Alex C.
UpTone Audio LLC
