checking digital output

rwagter · 31st March 2005, 06:21 PM

I recently picked up the build of a dddac and finished it. I checked all voltages and bias as well as dc on the output of the dac and every thing seems fine.

I connected the dac to the digital output of my sugden audition cd player and nothing

. I checked the dac again and again but cannot seem to find anyhing wrong. That made me wondering, is the digital output working ? Since I never used a seperate dac before and had some troubles with my cd player before.
I connected my multimeter to the output and measured 0 mV, nothing nada zipp, this cannot be normal can it? Since I'm a complete nOOb can someone help me with this question.

Ralph

sync40 · 31st March 2005, 09:10 PM

What is the digital interface? i2s? How did you connect from the digital output to the DAC?

rwagter · 1st April 2005, 05:45 AM

It's just a normal S/P-DIF output which goes thru a cs8412 to
8x tda1543

http://www.dddac.de/ma_dac22.htm

Ralph

frdchang · 1st April 2005, 10:57 PM

as a guess, your SPDIF output should be a train of pulses.

which means it should be somewhat an average of its peak signal.

i think i made a project long time ago using an SPDIF output and i don't recall using any buffers to interface to my PGA. (it could have been an audio extract from the IDE bus, but i don't think my profesor would have assigned such a difficult project)

so i'm assuming it outputs 5v?

so you should at least see ~2.5V?

i could be terribly wrong.

31st March 2005, 06:21 PM	#1
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	checking digital output I recently picked up the build of a dddac and finished it. I checked all voltages and bias as well as dc on the output of the dac and every thing seems fine. I connected the dac to the digital output of my sugden audition cd player and nothing . I checked the dac again and again but cannot seem to find anyhing wrong. That made me wondering, is the digital output working ? Since I never used a seperate dac before and had some troubles with my cd player before. I connected my multimeter to the output and measured 0 mV, nothing nada zipp, this cannot be normal can it? Since I'm a complete nOOb can someone help me with this question. Ralph

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31st March 2005, 09:10 PM	#2
sync40 diyAudio Member Join Date: Mar 2005 Location: Mexico	What is the digital interface? i2s? How did you connect from the digital output to the DAC?

1st April 2005, 05:45 AM	#3
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	It's just a normal S/P-DIF output which goes thru a cs8412 to 8x tda1543 http://www.dddac.de/ma_dac22.htm Ralph

1st April 2005, 10:57 PM	#4
frdchang diyAudio Member Join Date: Feb 2005 Location: Berkeley	as a guess, your SPDIF output should be a train of pulses. which means it should be somewhat an average of its peak signal. i think i made a project long time ago using an SPDIF output and i don't recall using any buffers to interface to my PGA. (it could have been an audio extract from the IDE bus, but i don't think my profesor would have assigned such a difficult project) so i'm assuming it outputs 5v? so you should at least see ~2.5V? i could be terribly wrong.

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