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+--- Thread: Thinking of making DAC (/showthread.php?tid=16)
Thinking of making DAC - stokessd - 04-06-2018
I've been making my own DAC's since the mid 90's. For the last decade or so, I've been feeding my various audio systems with an Airport Express from iTunes. I use TOSLink on my DACs. A few years ago, I made a semi-modern DAC to replace my tube based DAC from the turn of the century (I've been wanting to say that for a while now). Here's my latest DAC:
http://getinthewoodchipper.com/?p=302
It uses a CD8416 decoder chip to get from TOSLink or SPDIF to I2S. I then have an Asynchronous Sample Rate Converter (CS8421) to deal with jitter issues. Finally I'm using a CS4398 DAC chip which feed a pair of nickel core Lundahl LL1690 output transformers which act as the output stage. IT's a very good sounding and music DAC.
I'm planning on refining it to allow a rPi to be plugged in and powered to it as a daughter card. Any interest in this project.
Sheldon
PS Also First Post!!!!
RE: Thinking of making DAC - Tim Curtis - 04-06-2018
Hi Sheldon,
Really nice project. What interface, I2S or USB, are you planning to use between Pi and your DAC?
-Tim
RE: Thinking of making DAC - energyi - 04-07-2018
Interested. Been looking for a SPDIF input solution, ideally a RCA jack that utilizes a Rpi. Lots of SPDIF output available. Of course it would have to be Moode compatible.
RE: Thinking of making DAC - stokessd - 04-08-2018
(04-06-2018, 11:58 PM)Tim Curtis Wrote: Hi Sheldon,
Really nice project. What interface, I2S or USB, are you planning to use between Pi and your DAC?
-Tim
Thanks for the kind words. I was planning to use I2S, The dAC would still have TOSLink and coax in, and one of the inputs would be from the rPi header pins via I2S.
Sheldon
RE: Thinking of making DAC - yannig - 06-24-2018
(04-06-2018, 11:13 PM)stokessd Wrote: I've been making my own DAC's since the mid 90's. For the last decade or so, I've been feeding my various audio systems with an Airport Express from iTunes. I use TOSLink on my DACs. A few years ago, I made a semi-modern DAC to replace my tube based DAC from the turn of the century (I've been wanting to say that for a while now). Here's my latest DAC:
http://getinthewoodchipper.com/?p=302
It uses a CD8416 decoder chip to get from TOSLink or SPDIF to I2S. I then have an Asynchronous Sample Rate Converter (CS8421) to deal with jitter issues. Finally I'm using a CS4398 DAC chip which feed a pair of nickel core Lundahl LL1690 output transformers which act as the output stage. IT's a very good sounding and music DAC.
I'm planning on refining it to allow a rPi to be plugged in and powered to it as a daughter card. Any interest in this project.
Sheldon
PS Also First Post!!!!
PS Also First Post!!!!
Very nice project !
Just a little question : does the CS8421 respect the lossless principle ?
And a CS4398 (or another good Dac) "HAT" dac with output transformers is a nice idea.
Perhaps too a discrete R2R HAT dac.
I'm in !
yannick
PS : I do not like so much Sabre chips, try them versus AK4497, huge difference. Even a AK4399 is much better than "big" chips from Sabre.