Digital output for Studer A725

ebrjvd · 21st November 2004, 03:35 PM

Anyone knows how to make a digital output (S/PDIF, AES/EBU) to the Studer A725 (or Revox B225)?

It's using the early Philips chipset SAA7010, SAA7020, SAA7000, SAA7030, TDA1540.

Jos

rfbrw · 22nd November 2004, 05:40 AM

It is a fairly major task to add a SPDIF transmitter to the SAA70x0 chipsets.The feed to the SAA7030 from the SAA7000 is simultaneous and in offset binary format and as such it is easier to connect the TDA1541.To connect an SPDIF transmitter would require merging the left and right datastreams into a single serial datastream and conversion to two's complement. This would require a few TTL packages or a small CPLD.

Cobra2 · 22nd November 2004, 07:36 AM

I have the same problem: a Philips CD-304...

Would you concider selling a board that would do the job?

Arne K

rfbrw · 23rd November 2004, 10:19 PM

I wouldn't have thought there was much of a market for such a device. The old TDA1540 based dac are a dying breed and I can't see hordes of audiophiles roaming the countryside hunting down CD104's. Still, it would be an interesting diversion,even if only to see how these old machines fare as transports.

Cobra2 · 23rd November 2004, 10:42 PM

It would also be for the CD-104...

Arne K

guido · 23rd November 2004, 10:52 PM

Too much effort, buying a cdm4 based machine is easy these days for little money. I2S included to connect to spdif transmitter.

And cdm4 performs better than cdm0/1 i've been told. cdm3 somewhere inbetween. Talking about reading the data on the disk, not reliablity or looks

TDA1540 · 23rd November 2004, 11:57 PM

Quote:

roaming the countryside hunting down CD104's

rather a striking description of my sparetime....

rfbrw · 24th November 2004, 12:05 AM

Quote:

Originally posted by guido
Too much effort,

No sense of adventure??? Young folk today you don't know you're born. When I were a lad we had to make our own transistors.

Quote:

And cdm4 performs better than cdm0/1 i've been told

I'd rather find out for myself.

guido · 24th November 2004, 10:03 PM

Quote:

Originally posted by TDA1540

rather a striking description of my sparetime....

Wanna trade, cd-x for anything nice

(104 met een ander jasje).

Ray,

thanx for calling me young

As for the dig out, easy: connect an ADC to the DAC(s) and an spdif transmitter.

21st November 2004, 03:35 PM	#1
ebrjvd diyAudio Member Join Date: Sep 2004 Location: Mechelen	Digital output for Studer A725 Anyone knows how to make a digital output (S/PDIF, AES/EBU) to the Studer A725 (or Revox B225)? It's using the early Philips chipset SAA7010, SAA7020, SAA7000, SAA7030, TDA1540. Jos

22nd November 2004, 07:36 AM	#3
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Digital out I have the same problem: a Philips CD-304... Would you concider selling a board that would do the job? Arne K __________________ Ars longa, vita brevis

23rd November 2004, 10:42 PM	#5
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	You guessed it It would also be for the CD-104... Arne K __________________ Ars longa, vita brevis

23rd November 2004, 10:52 PM	#6
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	Too much effort, buying a cdm4 based machine is easy these days for little money. I2S included to connect to spdif transmitter. And cdm4 performs better than cdm0/1 i've been told. cdm3 somewhere inbetween. Talking about reading the data on the disk, not reliablity or looks __________________ GuidoB

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22nd November 2004, 05:40 AM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	It is a fairly major task to add a SPDIF transmitter to the SAA70x0 chipsets.The feed to the SAA7030 from the SAA7000 is simultaneous and in offset binary format and as such it is easier to connect the TDA1541.To connect an SPDIF transmitter would require merging the left and right datastreams into a single serial datastream and conversion to two's complement. This would require a few TTL packages or a small CPLD.

23rd November 2004, 10:19 PM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	I wouldn't have thought there was much of a market for such a device. The old TDA1540 based dac are a dying breed and I can't see hordes of audiophiles roaming the countryside hunting down CD104's. Still, it would be an interesting diversion,even if only to see how these old machines fare as transports.

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