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Old 4th June 2008, 02:11 PM   #10081
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Quote:
Originally posted by rowemeister


A shared psu for both clocks is better than one on psu and the other running off the main pcb supply. Both clocks are isolated from the main pcb this way.
Hi Brent

Does the combination Dac Clock + Divider give good results or should I wait and save more so I can use two clocks ?

Ricardo
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Old 4th June 2008, 02:17 PM   #10082
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Hi Ricardo

A tough one, the divide pcb gives half of the gains of a dedicated clock on the servo but its less than half the price. So if money is a problem then the divide pcb is a great option.
All circuits benefit from seperate psus but (especially with the divide pcb taking its signal from the master clock) one psu will be fine. The gain with running clocks off dedicated psu is it stops the noise getting back into the main circuits psus.

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Old 4th June 2008, 05:12 PM   #10083
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Quote:
Originally posted by rowemeister

A tough one, the divide pcb gives half of the gains of a dedicated clock on the servo but its less than half the price.
Walk us through the math.

Especially the "the divide pcb gives half of the gains of a dedicated clock".

Indeed - a tough one (couldn't resist it, sorry).
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Old 4th June 2008, 06:45 PM   #10084
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LOL OK. Maybe not explained the best it could have been

We all know what a dac clock does for the audio...
A clock on the servo of the 63 adds lots of gains mainly in the upper mids and treble. For instance the noise of a brush on cymbols will sound like white noise where when the clock is added you can actually hear these details for what they are, the sound produced much more real and acurate.
Using the divide pcb you get the same kind of gains just a little bit less, somewhere in between.

Hope that explains a little better.

Brent
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Old 4th June 2008, 07:00 PM   #10085
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Quote:
Originally posted by rowemeister
LOL OK. Maybe not explained the best it could have been

We all know what a dac clock does for the audio...
A clock on the servo of the 63 adds lots of gains mainly in the upper mids and treble. For instance the noise of a brush on cymbols will sound like white noise where when the clock is added you can actually hear these details for what they are, the sound produced much more real and acurate.
Using the divide pcb you get the same kind of gains just a little bit less, somewhere in between.

Hope that explains a little better.

Perfect..

Less is no good so I will opt for two clocks.

About the psu, in order to cut costs (and space) I was thinking about using only one PSU2.

Is it possible to leave this PSU GND unconnected to the main pcb ?

Ricardo
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Old 4th June 2008, 08:40 PM   #10086
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You can certainly try it disconected, i've ran them this way before.

Running two off the psu is fine.

Brent
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Old 4th June 2008, 09:01 PM   #10087
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Quote:
Originally posted by rowemeister
You can certainly try it disconected, i've ran them this way before.
Do you have any reserves regarding this setup ?

Maybe connecting the psu to star earth might improve stability ?

Ricardo
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Old 5th June 2008, 07:39 AM   #10088
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Personally I think you should connect it to the star earth that way the gnd references are the same on all pcbs.

Brent
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Old 5th June 2008, 09:30 AM   #10089
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Got my 470/16 BG for the DAC analog. These things are big, do they fit around opamps?
Anyway I'll stick with the 220/16 BG there...
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Old 5th June 2008, 09:36 AM   #10090
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Quality caps are always big

The 470uF JUST fit with a little squeeze, the 220uF fit perfect.

Brent
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