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Old 11th August 2009, 07:08 PM   #1
Dyolf is offline Dyolf  Norway
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Question FLAC to CD player internal DAC

Hi
I simply love the sound from my Cambridge CD3, and wondered if it was possible to somehow connect the digital output from my computer to the internal dac (4 x tda1541)
I do not have the schematic, but after reading a lot on the net about this player, it seems to be a relativly simple design.
Any chance that it could be done simply by finding the correct number and placement of the legs, and then solder an input cable?
any thoughts and maybe diagrams will be highly appreiciated.

Steen
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Old 11th August 2009, 07:51 PM   #2
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It is possible but it will take a lot more than a connector and a bit of wire especially if you want the CD side to remain operational.
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Old 4th December 2010, 10:21 AM   #3
T Leung is offline T Leung  Hong Kong
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Not just AB switch to go FLAC / PCM from cd ?
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Old 4th December 2010, 12:10 PM   #4
Pano is offline Pano  United States
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Probably not, tho it's a cool idea.

The Cambridge dac is most likely fed with an IIS (I2S) bus. It's more than 1 wire.
You could buy a USB to I2S adapter from someone like miniDSP and patch it in.
But the problem of switching still remains.
IS - Wikipedia, the free encyclopedia

Dyolf, did you ever do anything with this?
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Old 4th December 2010, 12:50 PM   #5
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Quote:
Originally Posted by panomaniac View Post
But the problem of switching still remains.


Nothing that a relay or two cannot solve. More elegant solutions are no doubt available but this worked for me for a couple of years and i could hear no degradation.
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Old 4th December 2010, 01:06 PM   #6
Pano is offline Pano  United States
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OK, cool. You didn't have any bandwidth or noise problems with the relays?
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Old 4th December 2010, 04:36 PM   #7
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44kHz does not need that much bandwidth. The only limiting factor a relay can present is interelectrode capacitance which to me appears to be on par with the pcb tracks. Didn't really measure the pulse's fronts but couldn't hear any degradation with or without the relays.
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Old 4th December 2010, 10:46 PM   #8
wwenze is offline wwenze  Singapore
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If you can't measure the digital-in to the DAC, how about measuring the analogue-out from the DAC to see any degradation in numbers?
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Old 5th December 2010, 05:58 AM   #9
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Why would i even suspect a "degradation in numbers"? The very worst i can expect is a slight rounding of the slopes due to the added capacitance. As the I2S is fed into an ASRC in this particular DAC, it seems to make no difference. A relay is just not all that different from a longer PCB track.
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Old 5th December 2010, 09:08 AM   #10
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No ASRC in the op's cdp. Makes things a little more complex.
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