Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th October 2012, 06:40 PM   #41
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
guys, he doesnt even know if he'll get the numbers to get it done at all, how could he know the price? or you mean for the BOM?
  Reply With Quote
Old 18th October 2012, 10:52 PM   #42
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Quote:
Originally Posted by qusp View Post
guys, he doesnt even know if he'll get the numbers to get it done at all, how could he know the price? or you mean for the BOM?
That's true.

Quote:
Originally Posted by merlin el mago View Post
Ian do you know aproximate price?
Quote:
Originally Posted by rtd View Post
I Might be interested too (not afraid of smt soldering )
So up for aproximate price too !
Hi guys, glad you are interested in the new NOS gear. You can start the interesting list now to see if there is a chance for the GB.

Please don't worry about the price, see my previous GBs. I'll take care for sure.

Good luck.

Ian
__________________
Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
  Reply With Quote
Old 19th October 2012, 12:44 AM   #43
diyAudio Member
 
Join Date: Feb 2005
Location: Melbourne, Aust
Ian,
Could these boards be configured to drive the 1541A dac chip in Nos mode? If so, please add me to Andrea's 4 boards for another 2.
__________________
... jh
  Reply With Quote
Old 19th October 2012, 02:20 AM   #44
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Quote:
Originally Posted by jameshillj View Post
Ian,
Could these boards be configured to drive the 1541A dac chip in Nos mode? If so, please add me to Andrea's 4 boards for another 2.
Do you mean

"When input OB/TWC input is connected to VDD1 the two channels of data (L/R) are input simultaneously via DATA L and
DATA R, accompanied with BCK and a latch-enable input (LE). With this mode selected the data must be in offset binary.
The converted samples appear at the output at the positive going transition of the latch enable signal."

---TAD1541A data sheet P4

Ian
__________________
Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
  Reply With Quote
Old 19th October 2012, 03:06 AM   #45
diyAudio Member
 
Join Date: Feb 2005
Location: Melbourne, Aust
Hi Ian,

Oh dear, I must apologise for a pretty total ignoramus regarding the technical aspects of the dac chip so won't take up more of your valuable time, but yes, I think this is the standard way the chip is configured when driven by either the SAA7220 o/psampling chip or in my use, directly from thre SAA7210 decoder chip (NOS).

I was hoping that this could be a "simple adaptation" (!, sorry) on this configuration that your are developing here for other people and not a troublesome project of it's own.

Thanks ... james
__________________
... jh
  Reply With Quote
Old 19th October 2012, 03:11 AM   #46
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
James,

When in doubt, check the first post I think that is the exact purpose of this project, unless I'm mistaken. There was a lot of discussion in the FIFO thread about the requirements for different chips and I thought most were catered for.

Quote:
Originally Posted by iancanada View Post
2. Support PCM63,AD1865,AD1862,PCM1704,PCM1702,TDA154 and other 2-2R DAC
Chris

Last edited by hochopeper; 19th October 2012 at 03:16 AM.
  Reply With Quote
Old 19th October 2012, 03:34 AM   #47
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Quote:
Originally Posted by hochopeper View Post
James,

When in doubt, check the first post I think that is the exact purpose of this project, unless I'm mistaken. There was a lot of discussion in the FIFO thread about the requirements for different chips and I thought most were catered for.


Chris
Thanks Chris

Quote:
Originally Posted by jameshillj View Post
Hi Ian,

Oh dear, I must apologise for a pretty total ignoramus regarding the technical aspects of the dac chip so won't take up more of your valuable time, but yes, I think this is the standard way the chip is configured when driven by either the SAA7220 o/psampling chip or in my use, directly from thre SAA7210 decoder chip (NOS).

I was hoping that this could be a "simple adaptation" (!, sorry) on this configuration that your are developing here for other people and not a troublesome project of it's own.

Thanks ... james
Hi James,

I guess you want to use the L/R simultaneous mode rather than the I2S. Yes, the daughter board should support 1541 on this mode. However, at this mode, 1541 need offest binary input format. Please correct me if I'm wrong .

In this case, I need write an additional code for format converter module of the FPGA/CPLD. Will do it once I get time. Please let me know your comment.

Regards,

Ian
__________________
Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
  Reply With Quote
Old 19th October 2012, 04:07 AM   #48
diyAudio Member
 
Join Date: Feb 2005
Location: Melbourne, Aust
Well, I'm very happy that you would consider my special requirements and even happier to use it as an alternative to John Brown's (EC Design) technique of isolating the computer from the dac via his SD card system especially as Jeremy's idea (qusp) of using an internal digital Xover that outputs 2 discrete signal paths (Hi Pass & Lo Pass signals) to 2 seperate dac chips via 2 seperate FIFO brds - it would be even better if a common master clock could run both the FIFO brds and the dac chips, possibly via divider/reclock.

I think there are quite a few folks that do prefer the sound of the old, fully tricked out 1541A dc chip running NOS and to have a top class interface that avoids the usual sound degradation problems of computer source is very promising indeed, particularly if it allows to 'maximise' the analogue nature of this dac chip/system.

I have heard a couple of the current computer source systems that use various ways of reclocking/isolating the computer but for some reason the 1541A dac in NOS mode is quite picky and seems to exphasize the problems, particularly when optomised - I thought it would be the opposite but unfortunately not, and no idea why.

I must apologise for my lack of technical knowledge and will follow up on your posts (do my homework!)

Many thanks ... James
__________________
... jh
  Reply With Quote
Old 19th October 2012, 04:18 AM   #49
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
James, Ian is usually very receptive to feedback and lightning quick at knocking up PCBs or models, ive not seen anything quite like it. so I encourage you guys to get involved and make this design do what you need, if you dont tell him, he cant know what you want. if the ideas are sound and well described, I dont think ive met another designer on here so open to consider/try other peoples ideas, particularly one that is so accomplished in his own right, so completely free of ego in that regard. He just wants the best result and that includes its interaction with the user and their goals.

and yes this is that board I was telling you about, its basically custom built for your needs driving NOS DACs and so much more flexible than any regular digital filter

it makes sense that NOS would be a bit more picky, as artifacts are more likely to be down in the audible bandwidth, instead of pushed up out of it. this is also why power supply is so important I guess, I guess NOS or NOT becomes a factor of PSRR in that way.

hell i'm considering playing with this thing for my ESS

Last edited by qusp; 19th October 2012 at 04:27 AM.
  Reply With Quote
Old 19th October 2012, 04:35 AM   #50
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
also James, dont sell yourself short, you are far from the beginner you make yourself out to be, you just have a more practical outlook. I dont doubt you have something to offer here (sorry for putting you on the spot =)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ian asynchronous I2S and S/PDIF FIFO KIT group buy iancanada Group Buys 1584 Today 09:26 AM
FS: Paralleled TDA1541 NOS/OS DAC Board pftrvlr Swap Meet 6 17th April 2011 09:39 PM
AD1865 vs PCM1704 steve jones Digital Source 30 28th December 2008 03:04 PM
Simple FIFO to I2S CPLD, for MCU players / reclocking KOON3876 Digital Line Level 21 19th September 2008 04:00 PM
Urgent sale a lot of NOS (produced in 1996) PCM 63 "K" grade! Altmustech Parts 0 26th August 2006 11:41 AM


New To Site? Need Help?

All times are GMT. The time now is 03:00 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2