Not religious, but this seems appropriate here.
"Do not give what is holy to the dogs; nor cast your pearls before swine,
lest they trample them under their feet, and turn and tear you in pieces."
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Get a Benchmark DAC-2. It is better than DAC-1 in several ways... test and listening-wise (yes, it is more transparent). .
[don't say it is too expensive... use a credit card...]
You will be a happy camper for a very long time IMO.
-RNM
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NEW ideas have to be hidden, least they be taken over as someone else's idea, as has happened to me over the decades. It is EXTREMELY frustrating to make friends with a fellow engineer and give them new ideas, and have them either try to patent it, or if they can't, then laugh at your patent on the same new idea that you gave them. After that, you can't even be colleagues.
Now this is not new. For example, if you go though the oral history given by Black about the development of negative feedback, you will find that he did the same thing, to protect himself against Bode and others, to keep them from taking credit back in the 1930's.
It is always the same:
1. The new idea won't work.
2. The new idea works but it is not important.
3. We invented the idea. (and we might write a book about it) '-)
Now this is not new. For example, if you go though the oral history given by Black about the development of negative feedback, you will find that he did the same thing, to protect himself against Bode and others, to keep them from taking credit back in the 1930's.
It is always the same:
1. The new idea won't work.
2. The new idea works but it is not important.
3. We invented the idea. (and we might write a book about it) '-)
Waly ----- Not everyone can be the King.
some of you have to sit on the curb and wave as I go by.
-RNM
Sorry Dick I over reacted. I thought I was clear this is not a mis-termination but an impedance discontinuity (and a very small one at that). The electrical length of the connector is 40 psec or so and as far as I can find out the rise time for SPDIF is 20 nsec at best or about 2mV in 40 psec. I can't see this being observable considering some of the internal wiring I have seen.
Attachments
Hmmm. Ya know, We seem to have sumptin in common.
Sigh....
Sometimes a high horse is really just a hobby horse.
Jn
The zobel is there to flatten the frequency response due to load impedance variations in the audio band. Other folks estimate the line impedance and do equalization to correct that.
But I prefer using passive zobels at the load, less for others to screw up.
So for display purposes but methods were shown.
yikes... that pic is scary wiring for HF/RF data pulses.........
extra unnecessary comment for some others is this....... discontinuity causes Z change and reflection etc etc. If, coming directly off the IC, the Tr would be much faster than 20nS. Depending on the magnitude of the Z change at the discontinuity and its reflected polarity... again, etc .... data error possibility is high. BUT, if you use a BW limited pulse transformer between O/I then the Tr is slower and more 'controlled'.... small discontinuities are less probmatic.
The Tr is around 20nS with transformers designed for audio digital. http://media.digikey.com/pdf/data sheets/pulse pdfs/pe-65x12_rev2006.pdf
But be sure jitter doesn't increase after you add transformers on your favorite gear.
and best practice would be coaxial 360 degree connection on connectors and not have pig-tails on such signal lines.
Never use pigtails on cable shields | EDN
THx-RNMarsh
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