Salvaged CD-6 DAC board

peppennino · 26th February 2021, 08:25 AM

Hi all,
I salvaged from a Cambridge CD-6 (brocken transport) a dual TDA1305 balanced DAC board.
Since I cannot find any hi-res image of the schematic, could you help me to find where to connect the input signal? Dac pcb has on-board psu and is very similar to the Dacmagic one.
Here's the only service manual I found:
Cambridge Audio CD6 Compact Disc Player Manual | HiFi Engine

The idea is to connect a Broskie's unbalancer before the opamps...

Cheers,
Vincenzo

rfbrw · 26th February 2021, 11:16 AM

What sort of input signal? SPDIF? SDATA,LRCK,BCK?

peppennino · 26th February 2021, 11:18 AM

Spdif or i2s

peppennino · 26th February 2021, 11:33 AM

This is the board

rfbrw · 28th February 2021, 01:18 AM

The CXD1167Q makes things a little tricky. If you want to use the board as is by connecting to CN2 you have to mimic the output of the CXD1167Q and sync the input source to the Cambridge board. The Cambridge board will supply MCLK at 256Fs or 384Fs but BCLK has to be 48Fs and data 16bit LSB justified. That will require glue logic.

peppennino · 28th February 2021, 06:40 AM

Thanks for reply. Not necessarily as is, I can change everything, as it comes free from a dismantled cdp..

rfbrw · 1st March 2021, 08:10 AM

The TDA1305 is naturally single ended. If you want something for the unbalancer to unbalance you have to leave it as is.

26th February 2021, 08:25 AM	#1
peppennino diyAudio Member Join Date: Oct 2005 Location: Betelgeuse V	Salvaged CD-6 DAC board Hi all, I salvaged from a Cambridge CD-6 (brocken transport) a dual TDA1305 balanced DAC board. Since I cannot find any hi-res image of the schematic, could you help me to find where to connect the input signal? Dac pcb has on-board psu and is very similar to the Dacmagic one. Here's the only service manual I found: Cambridge Audio CD6 Compact Disc Player Manual \| HiFi Engine The idea is to connect a Broskie's unbalancer before the opamps... Cheers, Vincenzo __________________ SL1210 + 6L6 PSU>834pTRLH + α2λ PSU/DDE3.0>B1R2>Moth30>π4 WIP: Aleph JZen, MiniPearl

26th February 2021, 11:18 AM	#3
peppennino diyAudio Member Join Date: Oct 2005 Location: Betelgeuse V	Spdif or i2s __________________ SL1210 + 6L6 PSU>834pTRLH + α2λ PSU/DDE3.0>B1R2>Moth30>π4 WIP: Aleph JZen, MiniPearl

28th February 2021, 06:40 AM	#6
peppennino diyAudio Member Join Date: Oct 2005 Location: Betelgeuse V	Thanks for reply. Not necessarily as is, I can change everything, as it comes free from a dismantled cdp.. __________________ SL1210 + 6L6 PSU>834pTRLH + α2λ PSU/DDE3.0>B1R2>Moth30>π4 WIP: Aleph JZen, MiniPearl

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26th February 2021, 11:16 AM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	What sort of input signal? SPDIF? SDATA,LRCK,BCK?

28th February 2021, 01:18 AM	#5
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The CXD1167Q makes things a little tricky. If you want to use the board as is by connecting to CN2 you have to mimic the output of the CXD1167Q and sync the input source to the Cambridge board. The Cambridge board will supply MCLK at 256Fs or 384Fs but BCLK has to be 48Fs and data 16bit LSB justified. That will require glue logic.

1st March 2021, 08:10 AM	#7
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The TDA1305 is naturally single ended. If you want something for the unbalancer to unbalance you have to leave it as is.