DIYHiFi.org

Pardon the o/t diversion, but I am sure this will come up sometime. If not it this thread, some other one.

OK, our buddies over at The Pub are trying to build a SOTA DIY DAC. Since a lot of us are not members, and can not see the actual schematic, we can still pick holes in its concept.

Good place to start:



Transformers do add jitter, but only if you don't know how to use them. I have a feeling these guys don't. (Nothing I have read by them gives me confidence they do.) I bet they use the standard hook-up, like the data sheet says, and expect it to work. The cause is added reflections. And the transformer everyone "prefers" (because the data sheet says to use it) is the worst one to match.

Maybe gmarsh will want to 'splain it. I'm tired of 'splaining it, and since Phred is not here to back me up.............

Yeah, stirring the pot, waiting to see what brews!

Jocko

_________________
"Because, I hate you guys. I hate you guys so very, very much.

Yours,
General Cartman Lee"

Check out this exchange! No, it is not me. AFAIK, it is not Phred, or any of a 1/2 dozen other people we both know that says the same thing.

"Project Manager" says: (Remember, any project needs a fascist manager if it is to succeed. Unless he is wrong!)



OK, Jocko/Phred clone replies:



Maybe there is hope for them. Very little, but some. It would be nice if someone here with dual-citizenship gives the guy who posted that some support. Whoever he is, he deserves it.

Jocko

_________________
"Because, I hate you guys. I hate you guys so very, very much.

Yours,
General Cartman Lee"

Wrong thread Jocko but if you want to answer my questions! Maxpou

Actually I posted once in the thread you mention, providing some links in hope that the project will get on the right track SPDIFwise. I even suggested that a small Tx board could be provided with each DAC board knowing that many transports out there are so-so and DIY-ers should be able to find a way to mount it inside.

No reaction yet....as of yesterday morning actually...I'll log in again to see how it is evolving.

Jocko, thank you for support
I am just trying to teach them what I learned
But I am just apprentice, project managers won't listen

@maxpou
some nice reading here http://www.teddypardo.com/Articles/articles.html

THAT WAS YOU!!!!!!!!!

You know more than most engineers that I know. Well done.

Jocko

_________________
"Because, I hate you guys. I hate you guys so very, very much.

Yours,
General Cartman Lee"

learned a lot from you and other experts on this forum. And still learning.
Then finished my homemade TDR, like this http://www.diyhifi.org/forums/viewtopic.php?f=2&t=429&hilit=+Make+your+own+TDR
Now I can see things, not only read about them

See, it isn't that hard. It takes time to learn it, but now you see what Phred and I (and lots of others) have been saying all along.

Jocko

_________________
"Because, I hate you guys. I hate you guys so very, very much.

Yours,
General Cartman Lee"

yes, agree 100% with you. I have only 100 MHz digital scope,
but enough to see rounded signal or reflections or wrong termination

I just love to see expensive audiophile grade, 99.99% pure silver cable,
terminated with Eichmann Cupper Bullet RCA's or other RCA for transmitting SPDIF signals

For SPDIF, 100 MHz is plenty of signal BW, so something like a Tek 465 makes a good TDR. And will show mismatches, that increase jitter.

Jocko

_________________
"Because, I hate you guys. I hate you guys so very, very much.

Yours,
General Cartman Lee"

Hi.

I'm glad to get a DIYer here who knows to talk about interconnects which can improve or affect sound bigytime.

FYI, my audio rig is hooked up with 6 pairs interconnects built of "audiophile grade 99.99% pure silver" conductors, which I DIYed. I don't see yet any brandname ICs come with pure silvers in the marketplace. If such pure silver commercial stuff did exist, I guess it would be very expensive.

PS: My tube power amp is also powered via a 3-wire power cord I DIY-built with 99.99% pure solid silver conductors of German origin.

I LOVE silver sound !!!!!!!

c-J

_________________
"If the facts don't fit the theory, change the facts" quoted Hans Albert
Einstein.

cheapJack, it was only a joke about using 99.99% silver cable with expensive RCA for SPDIF signal
Something like this http://www.oyaide.com/e_audio/audio_products_files/dr_db-510.htm

I can measure my digital cables, good quality coax is enough for me

Hi.

NO "joke" my friend. This is serious business for the sound, to say the least. If I don't hear the difference, you think I got nothing else better to do than burning my hard-eaned cash & man-hours for building audio silver ICs??

Sorry, I don't want to comment on pure silver digital audio cables as I am not yet & I won't be there.

Tell me what data did you measure on yr copper coax cable ??

c-J

_________________
"If the facts don't fit the theory, change the facts" quoted Hans Albert
Einstein.

He is serious.
You know how to search.

_________________
Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein

Jack, you are missing the point.
I think this was quite clear - relevant part in red:

_________________
Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein