Hi Brentrowemeister said:
Does the combination Dac Clock + Divider give good results or should I wait and save more €€€ so I can use two clocks ?
Ricardo
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.
Brent
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.
Brent
rowemeister said:
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).
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
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
Perfect..😉rowemeister said: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.
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
You can certainly try it disconected, i've ran them this way before.
Running two off the psu is fine.
Brent
Running two off the psu is fine.
Brent
Do you have any reserves regarding this setup ?rowemeister said:
Maybe connecting the psu to star earth might improve stability ?
Ricardo
Personally I think you should connect it to the star earth that way the gnd references are the same on all pcbs.
Brent
Brent
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...
Anyway I'll stick with the 220/16 BG there...
Quality caps are always big 😉
The 470uF JUST fit with a little squeeze, the 220uF fit perfect.
Brent
The 470uF JUST fit with a little squeeze, the 220uF fit perfect.
Brent
Malefoda said:
I have just the same issue.rowemeister said:
I think I will remove the 220uF BG around the opamps and squezze the 470uF in.
I will use the 220uF on CD15 CD16.
Ricardo
Hi Brentrowemeister said:
Fitting the DAC clock on pin 28 (using U196) will be easy.
Can I remove the stock X´TAL psu line ?
Maybe I could remove RD01 CD04 CD05.
Ricardo
You still need the 5V supply for the clock cct on the dac. Your best bet is to remove RD01 and solder in a 7805 so that it's more isolated from the rest of the circuit. Supply the 7805 from underneath the PSU from the big smoothing cap (+20V). Just check to see if the reg gets warm, I don't think it will.
Doing this will require the psu gnd connecting to star gnd
Brent
Doing this will require the psu gnd connecting to star gnd
Brent
Brentrowemeister said:
Should I use a LM340AT instead of a 7805 to improve noise rejection ?
Or maybe a LM317 with a gyrator ?
Regards
Ricardo
Yes of course 😉
The better the reg the better outcome you will get. A Raygulator type device will work a treat
Brent
The better the reg the better outcome you will get. A Raygulator type device will work a treat
Brent
Brentrowemeister said:
While I wait I was thinking about placing one Raygulator on +5v DAC Digital.
I already have a dedicated PSU for this reg.
What improvements should I expect from such modd? (I already have the Spower on DAC Analog and the sound is very good indeed with good integration and much better detail.)
Ricardo
Using something like an SPower will bring bigger gains but again thats going to cost alot more money!! So a Raygulator here will bring about better timing, a more precise sound etc. There will be less of that digital sound. Do it.
Just using 7805 everywhere brings gains so a Raygulator will improve further.
Brent
Just using 7805 everywhere brings gains so a Raygulator will improve further.
Brent