SPDIF taps (was ...we remember.)

[Magnus Danielson]

>>>>> "BS" == Bob Schrum <Bob.Schrum at harpercollins.com> writes:

 BS> Hey Magnus, I'm trying to do the same to my Denon DCD425.  Does anyone on this
 BS> list have any info on where to tap off the SPDIF signal among the following
 BS> chips?

 BS>     Sony CXD2500BQ, CXA1372AQ, CXA1571M, CXP82316
 BS>     Burr-Brown PCM1712U

 BS> I suspect the IC in question is the 2500.  I haven't yet found a local tech
 BS> friendly enough to get a look at the service manual (they just want to charge me
 BS> $100+ to do the mod themselves) and Denon's pretty tight about documentation.

I don't think the PCM1712 is worth looking at, but since I am (almost)
out of reference on the Sony CD chipsets I can't help you.

You might however tap the three-line interface to the PCM1712
http://www.burr-brown.com/Products/DataSheets/PCM1712.html
and add a separate little serialdata-to-SPDIF output chip.

Sony Semiconductors doesn't have them online (since they are out of
production it seems).

It should not be very hard to find a bunch of not connected pins on
these... many pins is quite obviously connected, so pinpointing the
once not occupied should help finding the signal, looking with an
oscilloscope you should be able to find the signal if available.

You would typhically need to adapt signal level and impedance before
going to a contact, and ensure that the waveform is within the correct
eye diagram.

 BS> Also, is anyone aware of any mail or web-based forums for audio DIY where I
 BS> could also pose this question without enduring serious discussions of $950
 BS> uni-directional orthogonally-crystalline double-shielded frequency-compensated
 BS> paradigm-aligned 96-bit twisted-pair digital optical cables, striped with a
 BS> green Magic Marker?  Y'know, just like this list--real electronics without the
 BS> mythical nonsense.

Dont forget to turn the electrons 3 times before reusing them in the
Magocrapial(TM) Monsterseries recylcer module...

Cheers,
Magnus