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C521BEE clock mod

post #1 of 5
3/24/09 at 11:03am
Thread Starter 
Hello,

I am in the process of replacing the clock with a D-clock (DEXA).
I also posted elsewhere about this, but got no real repsonses so far.
I do have the schematic for the NAD C521, but not for the C521BEE. Any differences?

The howto, as planned:

Power to be taken from the input of the 7808.
Rest of assembly:
Remove the 2 capacitors and the old xtal.
Connect the clock wire screen to near by GND, and the inner
conductor to pin 5 if PCM1710. Careful, this chip is a bit
sensitive to static electricity.

Question:

On the NAD C521 schematic that I have (not for BEE) I see small markings near the IC pins like 0V, 5V, 2.3V etc.
Are these indeed voltage indications?
How should I interpret the markings of 2.3V near the pins where the crystal is connected?
The D-clock does 3.3 and 5V. Which mode should I use in this case? (CD-players mostly do 5V and there is no 3.3V supply in the C521...)
Who can explain?

What about the quick analog tweaks?
Are capacitor values same as in NAD C521 for BEE version for the opamp capacitors?

Udo
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post #2 of 5
4/3/09 at 11:15am
Thread Starter 
Well...
I just did it.
The clock is in the C521BEE. I set it for 5V. Works OK.

The power wire is a bit short.
I attached it to the bottom of the board at U504 (7808) and ran it to the top of the board via the backside of the case.
At the PCM1710 location I removed the crystal and dual capacitors.
I soldered two pins through the board connecting to GND and pin 5 of the DAC chip using the remaining holes.
At the top of the board I connected the coax to these pins.

I used a standoff from a PC case in the hole near M320 to fasten the D-clock.
The other end rests over RL101.
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post #3 of 5
4/3/09 at 7:02pm
May I ask what you paid for this mod, and if it really sounds better..?
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post #4 of 5
4/4/09 at 1:55am
Thread Starter 
NewClassD Audio Clocks for the info. I have yet to check the sound out fully.
First impressions were: tighter, coherent sound
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post #5 of 5
2/12/11 at 8:29am
Thread Starter 

What about putting one of these onto the crystal of the D-clock?

Even more stability...

 

What do you think?

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