Converting a DAC

harrygrey382 · 12th June 2007, 02:38 PM

I've come on a faulty Marantz DD82 (DCC player) and am using it as an offbored DAC for my PC soundcard (PSC706). I like the sound and have herad it recommended by others too.

It's a massive box, with a huge amount of unwanted stuff. I want to pull it all out and rebox it. I've got the schematics and see the DAC bored is indeed small.

So my question is, is all I need the DAC bored and PSU out of it? I also can't work out from the diagram where you connect the board to the PSU, and the audio in. I bought the schematics online and most of them are crap quality (amazingly, the DAC page is about the only decent one). Also, I can't find the required voltage (I assume different parts of the player would require different voltages, or would they ALL be the same - allowing me to connect the PSU out straight to the DAC regardless?).

How would I find this out, or could I guess, using a reasonable standard (15V maybe?)?
Thanks

harrygrey382 · 12th June 2007, 04:38 PM

Here's part of the DAC schem

harrygrey382 · 12th June 2007, 04:40 PM

and another

FastEddy · 12th June 2007, 05:29 PM

In My Opinion and You are not going to like my opinion, but, here goes: Keep the Marantz unit the way it is and use it as your audio DAC until you can get something that will process 24 bit audio ... Don't waste you time trying to rebuild or redesign it.

harrygrey382 · 12th June 2007, 05:44 PM

hmm, ok. What would that be though? Can you recommend any PCBs to buy that will process 24bit?

rfbrw · 12th June 2007, 07:09 PM

What is the dac chip ?

Fin · 13th June 2007, 01:53 AM

The DAC chip is probably SAA7350.

rfbrw · 13th June 2007, 02:49 AM

If that is indeed the case, the next question is what is the preceding digital filter ?

Fin · 13th June 2007, 03:14 AM

I would think that it is either SM5840 or SAA7321/2.

From memory, this machine was produced at about the same time as the Marantz CD42/52/72 and the somewhat different CD62.

The CD42/52 and CD72 used SM5840 as filter with the SAA7350 as DAC - all on one main PCB. The CD62 used SAA7322 as filter on the main PCB - with SAA7350 as DAC on a separate audio board. They all used SAA7310 as decoder.

rfbrw · 13th June 2007, 06:38 AM

Either way, with the addition of a CS8412 or similar, the OP's DCC can be turned into a DAC. Despite its 20 bit limitation, the SAA7350 is still a pretty good device.

12th June 2007, 02:38 PM	#1
harrygrey382 diyAudio Member Join Date: Jun 2006	Converting a DAC I've come on a faulty Marantz DD82 (DCC player) and am using it as an offbored DAC for my PC soundcard (PSC706). I like the sound and have herad it recommended by others too. It's a massive box, with a huge amount of unwanted stuff. I want to pull it all out and rebox it. I've got the schematics and see the DAC bored is indeed small. So my question is, is all I need the DAC bored and PSU out of it? I also can't work out from the diagram where you connect the board to the PSU, and the audio in. I bought the schematics online and most of them are crap quality (amazingly, the DAC page is about the only decent one). Also, I can't find the required voltage (I assume different parts of the player would require different voltages, or would they ALL be the same - allowing me to connect the PSU out straight to the DAC regardless?). How would I find this out, or could I guess, using a reasonable standard (15V maybe?)? Thanks

12th June 2007, 05:29 PM	#4
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	In My Opinion and You are not going to like my opinion, but, here goes: Keep the Marantz unit the way it is and use it as your audio DAC until you can get something that will process 24 bit audio ... Don't waste you time trying to rebuild or redesign it. __________________ Over compression is a problem with modern CD recordings

13th June 2007, 01:53 AM	#7
Fin diyAudio Member Join Date: Dec 2003 Location: -	The DAC chip is probably SAA7350. __________________ Regards Fin

13th June 2007, 03:14 AM	#9
Fin diyAudio Member Join Date: Dec 2003 Location: -	I would think that it is either SM5840 or SAA7321/2. From memory, this machine was produced at about the same time as the Marantz CD42/52/72 and the somewhat different CD62. The CD42/52 and CD72 used SM5840 as filter with the SAA7350 as DAC - all on one main PCB. The CD62 used SAA7322 as filter on the main PCB - with SAA7350 as DAC on a separate audio board. They all used SAA7310 as decoder. __________________ Regards Fin

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12th June 2007, 05:44 PM	#5
harrygrey382 diyAudio Member Join Date: Jun 2006	hmm, ok. What would that be though? Can you recommend any PCBs to buy that will process 24bit?

12th June 2007, 07:09 PM	#6
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	What is the dac chip ?

13th June 2007, 02:49 AM	#8
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	If that is indeed the case, the next question is what is the preceding digital filter ?

13th June 2007, 06:38 AM	#10
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Either way, with the addition of a CS8412 or similar, the OP's DCC can be turned into a DAC. Despite its 20 bit limitation, the SAA7350 is still a pretty good device.

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