Marantz CD63 & CD67 mods list

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#5,462
poynton said:


As you rightly observe, most PCs output SPDIF.

So what would be needed is a SPDIF - I2C converter board .
Not a difficult proposition - Front half of an external DAC.

You could also build one with a USB connector.

I think that would be beyond the scope of this thread but would be of interest to many people.


Andy
Click to expand...


Hi,

Looks like this will do the job if anyones interested.

http://www.diyparadise.com/usb.html

Regards

Pete
 
#5,464
YoungSC said:
Went to a local electronics store caled Lanstaztic and the owner advised me to just add another 1N4148 in series with the existing one.

His opinion is that LED's put out too much noise.

I am getting 4.95V, so I will now start the production line.
Click to expand...
Hi,
are you using a three diode string (2 red LEDs + 1n4148)?
to get 5.65V output?

If so, then removing the 1n4148 will give the correct voltage 1.8+1.8+1.25~=4.85V.

Check your output voltage into a variety of dummy loads from just below quiescent current to just above [maximum output current + quiescent current] to ensure the regulator is really regulating. Can you vary input voltage to check for variations on output?

The data I have seen is that LEDs are very quiet compared to other diode type voltage references, particularly Zeners, which are very noisy.
 
#5,465
Chivvyp said:



Hi,

Looks like this will do the job if anyones interested.

http://www.diyparadise.com/usb.html

Regards

Pete
Click to expand...
Im definitly interested! Ill email the guy that sells them and ask if they are still available. If not we will have to figure something else out. Is anyone else interested in this at all?? If we get some interest in it maybe we can put our heads together and come up with something🙂 Im very interested in using the cd67 as a stand alone DAC for my PC. Anyone know if you would still have to press play to get sound out of it if your not using the cd transport? Or does the play button just control the transport? Where would we hook up the I2s output in the cd67? Ill let you guys know what I find out.
thanks
 
#5,467
usb to spdif converter
this could also be modded to output i2s. It uses the Philips uda1321 usb dac chip which outputs i2s.

I also found this thread
usb->i2s->dac

seems other people have tried what we want to do, but i'm surprised with the amount of cd63/67s floating around that no one has tried converting it to a dac?? The only negative is that usb will only output 16/44 which isn't a problem for us since the cd63/67 only does 16/44. I guess I wont be able to play any of my 24/96 files with this setup, but I only have a few so its not a big deal. I'm willing to spend the $30 to try this, but ill need some help with how to hook it up and all that stuff.
happy listening!
 
#5,469
imperfectcircle said:
Ok well I just checked the website an the USB converters are in stock for $30 USD. Im thinking of ordering one, but id like some input about this from the cd63/67 experts in here , Im a college student so money is tight and I dont wanna waste $30. So how bout it guys, will this work??
Click to expand...


You could also add a couple of gates to switch between the internal cdm and the external cd source.

Andy
 
#5,470
AndrewT said:

Hi,
are you using a three diode string (2 red LEDs + 1n4148)?
to get 5.65V output?

If so, then removing the 1n4148 will give the correct voltage 1.8+1.8+1.25~=4.85V.

Check your output voltage into a variety of dummy loads from just below quiescent current to just above [maximum output current + quiescent current] to ensure the regulator is really regulating. Can you vary input voltage to check for variations on output?

The data I have seen is that LEDs are very quiet compared to other diode type voltage references, particularly Zeners, which are very noisy.
Click to expand...

Hi Andrew,

I'm getting the same voltage from a 9V battery and a 12V AC/DC converter into a 470 ohm load.

You may be right about LED's being quiet. You would definitely know more about that than me. Ray's plans had Zener's so I thought I'd stick with that. The regs do look cool with LED's though 🙂

Simon
 
#5,471
Hi Young,
can you confirm what you have finally used to achieve that 4.95Vdc output?

Edit,
What did you actually use that gave the successful result?

That ref to excess current through the zeners is wrong. The current through the Zeners is limited to the regulator current + the resistor out to adjust (1.25/100)
 
#5,473
imperfectcircle said:

Im definitly interested! Ill email the guy that sells them and ask if they are still available. If not we will have to figure something else out. Is anyone else interested in this at all?? If we get some interest in it maybe we can put our heads together and come up with something🙂 Im very interested in using the cd67 as a stand alone DAC for my PC. Anyone know if you would still have to press play to get sound out of it if your not using the cd transport? Or does the play button just control the transport? Where would we hook up the I2s output in the cd67? Ill let you guys know what I find out.
thanks
Click to expand...

Hi,

I believe the I2S feed goes through RD11 (DATA), RD12 (SCLK), RD13 (WCLK) on the 63.

R501,2,3 on the CD67 I think but you'd need to trace from pins 45,46 and 48 on the SAA7372 to be sure.

Incidentally, I've also read about lifting these 3 resistors and feeding through a TDA1543 to make the marantz nonoversampling. It's something I might try if I can get hold of a TDA1543 cheaply (evidently stacking 8-10 of them gives a very good result).

You/d have to be careful when using the Marantx as a transport not to disconnect anything (like clock disconnects between clock and chip) which give focus errors or similar and stop the machine functioning.

Regards

Pete
 
#5,474
Hi there!

First, I've now a gain at my Hphones opamp of... 1! So It's almot useless here, is it ok to remove all? I mean bypass all hphones pcb (and remove stuff) and wire from C901/C902 (removed) to J901. Then may C980 be upgraded for sound?

Second, we have an exclusive Nora Jones performance on one of our biggest radio here, I'll try to record it at CD's PCM specs. Does some want it?

Thanks for hphones answer 😉
 
#5,475
No sure how many of you have improved your mains whether it be with a new lead or using such items as Russ Andrews sells.

Well I have stripped down the Mini Purifier (£150)

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


What did suprise me was the lower component count and less filtering capabilities it had compared to my own Ultra plug (£65). Some over pricing there I think!!!

No Noise Ultra piccy (note:- pic is from development stage, some parts have changed)

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


Brent
 
#5,477
Hi Andy

Of course some of the cost is R&D and time to build but its just as quick to build that as his Silencer plug. So yes its over priced. It takes me a good 30 mins (and i'm efficient at it) to build ours.

The diode is a transient diode.

The Toffee is an unknown quantity at the moment, I have feelers out all over the place and nobody knows what it actually is.

As a company we are trying to get similar products out to people at much more sensible prices. These plugs do work but paying hundreds of pounds for a few plugs makes it hard to part with your cash. These prices put people off from even trying such a product.

Brent
 
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