Hello Andrea,
May you please tell us which SC-Cut will be onboard for the futur discrete R2R the team plans ? Perhaps several choices planned : 16/48 or 24/192 proof ?
Is there a danger, risk of some sort when switching off or putt off the LiPoFe4 cells from the oscillator circuit ? I refer to an input from you I believe I don't understand about SC-Cut and power supply management : iir "the laptechs should never powered off from the cells" something like that. Didn't understand if it is because it's long to stabilize for sound or if it can hurt the SC-Cut with on/off if batteries or ldo regs according the regultion choice.
Btw for those being a little on the low side of monney these days as I am btw, I remember Sure is making a LiPoFe anagement board a little as IanCanada but very cheap, certainly bery diferent as well, but trade off possible.
May you please tell us which SC-Cut will be onboard for the futur discrete R2R the team plans ? Perhaps several choices planned : 16/48 or 24/192 proof ?
Is there a danger, risk of some sort when switching off or putt off the LiPoFe4 cells from the oscillator circuit ? I refer to an input from you I believe I don't understand about SC-Cut and power supply management : iir "the laptechs should never powered off from the cells" something like that. Didn't understand if it is because it's long to stabilize for sound or if it can hurt the SC-Cut with on/off if batteries or ldo regs according the regultion choice.
Btw for those being a little on the low side of monney these days as I am btw, I remember Sure is making a LiPoFe anagement board a little as IanCanada but very cheap, certainly bery diferent as well, but trade off possible.
Diggy, one can always turn on /off crystal oscillators safely. No problem at all. It's the long term stability that suffers. So not good to turn it off for hours until battery bank recharges..
Ciao, George
Ciao, George
Ok, thanks Joseph K. Good to know ! No problem for me to wait some hours the day I put reloaded battery into the board... 🙂. My actual TDA1541A dac needs 30 minutes to 1 hour to gives his best, so the few times I will change the cells reloaded I can wait a day if necessary for best sound, that's not a hard trade off !
Both DACs don't have any oscillator on board, you have to use external oscillators and squarers.
In order to get the best performance from the oscillators both DAC will run with 5/6 MHz, so we suggest the DRIXO or the EXO.
There is no risk to damage the oscillator powering them off, we suggest to keep them always powered on because they need time to get stability, so one should power them on at least one hour before listening to music, then is simpler leave them powered on.
LiFePo4 battery system is ready and working, we have just to adjust the final PCB.
But our system is not cheaper than Ian's one, it will be more expensive, as an example our system does not use any switching power supply, we use linear PSU to manage and recharge the batteries.
Tipically, our new devices will be more expensive than other diyaudio projects, like Ian's and Soekris stuff, because we are looking to get the best performance as possible for each device, regardless of the final cost. Indeed we have developed SOTA oscillators, but as you can see the prices are much higher than Crystek and so on, although they are cheaper than the NDK DuCuLoN and perform better.
well the lipo board from Ian is already too expensive for me... a whasing machine price. I believe the Sure will do or at least a simple bank with no sota reg board and relay. Long term stability I understood is not the SC Cut charechteristiv affected but just the time for it to warm up between two batteries swap ????
Looking forward the r2r as I know you do not set up and check with a Sheneizer headphones your R2R development as some did, promising to death the front end could not be heard...lol! With the habits of the tda1541A I can surmise a good final result. Just hope I can afoard it and you have not slided too fast on the expensive side and OEM futur horizon of the diy... which is not for the time spent I know or the fact it's not branded with fix charges every month.
Thanks for the good job to the team and the high skilled inputers of the thread.
Looking forward the r2r as I know you do not set up and check with a Sheneizer headphones your R2R development as some did, promising to death the front end could not be heard...lol! With the habits of the tda1541A I can surmise a good final result. Just hope I can afoard it and you have not slided too fast on the expensive side and OEM futur horizon of the diy... which is not for the time spent I know or the fact it's not branded with fix charges every month.
Thanks for the good job to the team and the high skilled inputers of the thread.
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Yes, new DAC will be segmented thermometer/R2R sign magnitude.
Master clock 5.6448 and 6.144 MHz, LRCK divided directly from master clock, FIFO front-end slaved to the DAC.
SOTA! That has the potential to blow away commercial DACs at all price points.
We hope so, as I said we are designing all new devices to be the SOTA in the audio scenario, regardless of price.
The new DRIXO and EXO oscillators are just the first example of our philosophy: design the best oscillators ever built for digital audio and share them with the audio community.
And when possible providing these devices at a reasonable price, much less than the other SOTA devices on the market (as example the MSB femto33 is sold at $19,900.00, while our oscillator is a femto8.2)
Obviously there is a price to pay.
Our new audio devices will not as cheap as Ian's or Soekris's devices.
And mostly, since we do that as an hobby, our developing time will be inevitably long, much longer than the other designers of this forum.
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Excellent. Aside from self satisfaction of DIY, I like the economic value. A commercial SOTA device needs a 90% gross margin to be viable. We can build same or better paying only the 10% for cost of goods sold. Just need the brilliant designers like you to make it possible for the rest of us.
Sounds great, looking forward to hearing more details.
Something else thats sorely needed is a SOTA purely audio purposed digital transport, even with cost as no obstacle there are practically zero options currently.
Something else thats sorely needed is a SOTA purely audio purposed digital transport, even with cost as no obstacle there are practically zero options currently.
In a far future .... maybe a SD card transport, slaves to the FIFO/DAC.
Not the best practical way (small capacity compared to music server, high cost of the mass storage), but the most audiophile solution to limit the EMI/RFI of the alternative devices.
Again, do not stack the digital chain as proposed by Ian, keep as far as possible the FIFO from the Raspberry, and keep as far as possible the oscillators and the DAC from the FIFO.
If you don't trust me, please do a RFI measurement with a spectrum analyzer close to the Raspberry.
Maybe not longer than all 🙂
That's the first thing I found out when trying out one of those stacks. Posted pics and text in the forum on one way to separate the boards, including how to attenuate the RF coming out of the dac before it gets into the I/V opamps. Don't think anyone paid much attention to it though.
This SD card player has a small following, and subjectively any PC based playback systems havent come close to it.
Im doubtful how clean the I2S output from this SD card player could be, design seems a bit flaky, so we can only imagine how good your attempt at something like this might be.
Im doubtful how clean the I2S output from this SD card player could be, design seems a bit flaky, so we can only imagine how good your attempt at something like this might be.
There were a few posts spread out over a few days. Don't know if I mentioned in those posts I could find or not but the ribbon cable between the dac and the output stage was folded over and taped in a particular way so as to minimize as much audible distortion as possible. Previous experience with twisted pair distributed filter structure gave me the idea to see if the ribbon could be used in a somewhat similar way.
https://www.diyaudio.com/forums/pc-...essions-tweaks-mods-hints-33.html#post5788176
https://www.diyaudio.com/forums/pc-...essions-tweaks-mods-hints-36.html#post5792013
https://www.diyaudio.com/forums/pc-...essions-tweaks-mods-hints-40.html#post5803366
https://www.diyaudio.com/forums/pc-...essions-tweaks-mods-hints-45.html#post5809414
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