CD Player as a DAC

I designed a small SAA7220 adapter board,  it adds a coax digital input on a SAA7220 Chipset CD-player, so it can used as a DAC when the cd player is not playing . When the CD player is started the spdif input is switch off and the cd player is working as normal.The spdif interface is based on a WM8804. and can be used at  32 , 44.1 and 48 kHz.

Idea started on MFBfreak.com

A small Demo using Raspberry PI with Moodeaudio  – demo_cd_dac

Proof of Concept.

Design a prototype  circuitboard…

 

 

 

 

Some Measurements Digital input

 

 

 

 

 

 

 

Digital input in CD 650

Digital input in CD 472

 

En CD 471

In a CD 670

Just enough room

In a CD 880 photo by Paolo

photo by Paolo

Here in a Cambridge CD 3

Nieuwe Versie ietsje smaller

 

CD as a DAC in Marantz CD85 , with NOS switch

 

 

Here in a CD94  , with little modification