Use a DAC of a CD-player ? - diyAudio
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Old 16th October 2004, 06:44 PM   #1
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Default Use a DAC of a CD-player ?

Hello, I have a very good quality cd-player but the transport is broken. I know that the analog circuit of this cd-player is excellent. I want to know if it is possible to convert my CD-player to a DAC with a digital input ???

thank you
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Old 16th October 2004, 11:38 PM   #2
dangus is offline dangus  Canada
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Possibly.

One of the many projects I haven't got around to yet is the "almost-free-DAC" based on a broken CD player I got for 25 cents. Not a high-end CD player by any means, but it does have a digital filter that I have a data sheet for and a pair of Analog Devices DACs, so it shouldn't be difficult to cut away this corner of the pc board, add regulators and better opamps in the analog section, and kluge an S/PDIF input (probably using an AD1892 receiver/sample-rate-converter chip, although that may be overkill).

So, identify the digital filter chip, and figure out how to feed it.
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Old 17th October 2004, 03:30 PM   #3
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I'a not very experimented in DAC circuit... But i saw in some chematic, that the RCA 75 ohm input cable go to a (DIGITAL INPUT RECEIVER) chip before the (DIGITAL RECEIVER) chip !

So, the digital input have to go where exactly ?
excuse me, I don't know very much in digital system.

For the modification, I will do nothing, the power of this cd player is the analog parts. This cd player was created by Steve Mc-Cormack in 1987. At this time, it was a very very good sounding cd player.

thank you for your help !
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Old 17th October 2004, 06:39 PM   #4
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You have to know what digital filter it is to know what format to feed to it, either I2S, or left-justified.

If "Mud Squid" made it, it is probably Philips based, and it takes I2S. My guess is the chassis is a "Maggot Box" CDB-650, right????

Jocko
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Old 18th October 2004, 02:00 PM   #5
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Yeah, it is a Mod Squad cd player. A plilips CDB-473 modified...
Inside, I can saw the TDA1541, but I cannot find the digital filter ?? Anybody can help me ??

TDA5708 28 pin
XC86604P 40 pin
SAA7220 P/A 24 pin
SAA7210P 40 pin
MAB 8441P T113 28pin
X2816BP 24 pin
TDA 5709 20 pn
8703E8206 18 pin

????
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Old 18th October 2004, 03:05 PM   #6
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Default OK......I was off by one model number.......

SAA7220. It is located right in front of the DAC!

Jocko
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Old 19th October 2004, 01:50 PM   #7
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Thank you very much.
I found the datasheet here

http://www.alldatasheet.co.kr/datash...S/SAA7220.html

But I don't understand very well that. Maybe I have to put the digital output of my cd player in pin #2 and 3 ??
#2 = CLAB Clock
#3 = DAAB Data

But I very don'T know.
Do you know where is the input of that chip and how to use it ?

thank
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Old 19th October 2004, 01:54 PM   #8
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Ok, I just saw the DEVELOPMENT DATA in page 19 of the datasheet.
the SAA7220 work with the SAA7210, maybe the input is in the SAA7210 chip ?
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Old 19th October 2004, 03:23 PM   #9
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Default There isn't one input......

There are 4:

Master clock

Bit clock

Word clock (aka L/R clock)

Data

There is a thread about hooking up a CS8414 to NPC and Philips filters. Read it. Get the data sheet of all of those parts........read them........then ask questions.

Jocko
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Old 19th October 2004, 03:45 PM   #10
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Yeah, I understand they are 4 connexion between the SAA7210 and the SAA7220. But, I need to know where is the digital input of all of this ?
I read the datasheet, but it is not very clear for me !
thank
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