Need schematic for a Cambridge Audio CD3 cd Player

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#62
Hi

Quite a nice thread.

I've merged the digital CS8412 section of a NOS dac with the CD3 schematic.

Anybody could tell me if my connections and schematics of my two parts are ok and if it would work ?

Here's the schematic images result in two parts.


Thanx

Paul


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.
 
#65
Hello

The "ultimate 1541 DAC" thread are much more complicate and difficult, I still have problems to understand it, and the DI8 schematic using 8 TDA1541 chips are too difficult for my limited knowledge in digital electronics, especially if I want to use it with only 4 TDA1541 chips.

I find that Cambridge DAC3 schematic much more easyer to use.

Anybody know if it would work correctly, without the 7220, in a non-oversampling mode, and give the correct bit clock shifting result ?


And to Paul Tessier, the schematic that you show are not the CD3 but the DAC3 done by Pilli, and thank a lot for merging the digital CS8412 section of a NOS dac with the DAC3 schematic, that was a great ideas.



Thank a lot and Merry Christmas to all the guys.

Bye

Gaetan
 
#66
gaetan8888 said:
... the DI8 schematic using 8 TDA1541 chips are too difficult for my limited knowledge in digital electronics, especially if I want to use it with only 4 TDA1541 chips.
Click to expand...

Well, isn't ecdesigns just doing what the CD3 does, only that they have the DACs differential?

I mean, those shift registers "create" 4x oversampling.
Cambridge does this after a digital filter (the SAA7220) also oversampling 4x, so that it results in 16x.
ecdesigns does it "double" because of two sets of DACs in differential... but still 4x "os" (though they don't call it so).

Maybe it's a too naive intuition, but I would expect that the "non-os" setup with four 1541 and no 7220 can work, just it is a 4x oversampling, so may need the timings/shifts to be checked, and some "more filtering" before the output than the Cambridge.


(It's frightening how lazy and approximate my understanding is! Say I do it to stimulate others' thinking... :smash: )

-
 
#68
Cambridge Audio CD 2

Hello
Does any one know of any mods for Cambridge Audio CD 2 or a link to another thread for this or another DIY website 🙂 Also what is the difference between Cambridge Audio CD 2 and Cambridge Audio CD 3
any help would be much appreciated.
 
#70
Dac 3

Top view of DAC 3 in attachment
Does not seem very different to CD3
 

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  • DAC3 7.jpg
    DAC3 7.jpg
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#74
Bringing this back to life, as I recently bought a faulty CD3.

The schematics are now available at HiFiEngine.

Mine has a faulty shift register chip - just one, but I will replace all 6. I'll take photos of the bare PCB when I strip the old ones out if there's interest?

Mine has the same 6 chips fitted; SN74LS166N
An externally hosted image should be here but it was not working when we last tested it.

33976265163_6587a2eeee_c.jpg


Richard
 
#76
For posterity - here's the shift register board of the CD3 without the chips so anyone who needs to can follow the traces;

34076168633_e2284280ac_h.jpg

34043819644_959bd0bf69_h.jpg


Mines now working, and has had a full recap. Just tracing down a new display unit - it flickers mostly.

Once fully functional I need to decide whether to mod it...almost a shame to with such a unique design!

Richard
 
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