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Old 14th January 2009, 02:04 AM   #2501
Peter Daniel is offline Peter Daniel  Canada
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I don't use the pads on rectifier board, but form the pins of the large caps and solder wires directly to those pins.

Yes, that would be the holes for those caps.
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Old 14th January 2009, 02:57 AM   #2502
raypalmer is offline raypalmer  Canada
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Ok. Thanks. I'm running 1500uF Panasonic FC Caps through the holes next to where the 4.7uF caps go in your instructions. I can't tell you how admirable your product and willingness to handhold amateur customers is. Cheers.
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Old 17th January 2009, 03:13 AM   #2503
Greg Stewart is offline Greg Stewart  United States
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Default Re: Re: The problem is USB

Quote:
Originally posted by Peter Daniel


In my setup, it's the other way, and in my experience, properly implemented USB sounds better.

I will repeat what I wrote earlier:

I had a PCI card (M-Audio Audiophile 24-66, which according to some people is in a same class as Juli@), breakaway cables bypassed, Belkin Synapse reference cable to extensively modified Bidat.

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USB setup consists of USB DAC connected virtually directly to mobo.

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In my setup, I feel clear preference for using USB, can't explain why, but it simply sounds better, to me.

BTW, I was recently experimenting with SATA cables and it seems that going custom route brings some benefits as well:

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Peter,

I found all your comments on setting up a computer-based audio system very interesting... And that plus reading cics's AOB and other recipes along with the many comments over on AA got me started down the path of doing my own PC-based system.

I'm starting out with a very 'stock' cics-specified system... and I'll be starting out using your SPDIF DAC fed from a Juli@ card. I have a few questions related to this...

1st, what's the max bit depth and rate your SPDIF DAC will handle? I've read the TDA1543 will do 192 sampling rate, but I seem to remember that the CS8412 does not. And I'm pretty sure both are limited to 16 bits and won't do the full 24 bits from a cMP-Squared machine.

2nd, what's the details on your ultra-deluxe USB DAC? I can see the V-Caps for outputs (which version?) and the Caddock TF020 for the I/V and VREF resistors (likely from Michael Percy, as Parts Connexion doesn't list the right values). Any other changes you'd care to share? And is all of this applicable to your SPDIF DAC?

3rd, what are you doing with your computer-based nowadays? I like what you do in optimizing your system and am always interested in harvesting ideas from your directions. For example, are you still using the PicoPSU with the linear supply? That seems to me to be an excellent way to go for these setup... And use linear supplies to replace the distributed supplies as specified by cics in the cMP/CPLAY setups.

TIA!

Greg in Mississippi

P.S. The other reason I'm hot-to-trot on this AOB/cMP-Squared system is the success of my Shigaclone. It sounds quite good and I'm very happy with it... And excited about the possibility of eventually surpassing it with the PC-based music player!
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Old 17th January 2009, 06:21 AM   #2504
Peter Daniel is offline Peter Daniel  Canada
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Hi Greg,

The NOS DAC will only work with frequencies up to 48 kHz and Iím pretty sure itís limited to 16bits. Presently, Iím only listening to CDs, so for me that does not impose any limitation.

The Ultra Deluxe version uses V-Caps in the output and Caddocks TF020 for Vref and I/V conversion. So far, this is the best combination I could come up with and it does not seem like there is anything better (BTW, Vishays didnít work well here). Comparing to stock Rikens and BG N itís not mind blowing, maybe some 10% better: itís mainly more refined with less ďhazeĒ but also slightly less musical and warm. I wouldnít loose any sleep if had to go back to Riken/BG N combo.

The only other area I was experimenting recently, are the 4 main filter caps. I had here for a while BG FK 2200/35 and it seemed to me like a right choice, until one day I compared a DAC I just built for a customer and the stock DAC was better than my ďaudiophileĒ version with tweaked caps. So I went back to BG STD/NX combo and this is how it will stay. Placing BG N 470/16 in place of C2 brings further improvement, but still of rather subtle nature.

Those mods are certainly applicable to SPDIF DAC as well, and in a past I was also using 4 x BG N 1000/50 with SPDIF DAC and it seemed like an improvement to me, but when I tried those caps with USB version, it didnít work at all.

My computer setup looks like in attached picture. I installed motherboard on a spruce board with an aluminum angle attached and working as heat sink for LM7812 regulator. Iím still using PICOPSU and the cap installed there now is BG N 470/16. There is another cap attached to the angle and it provides filtering before regulator (Panasonic Audio Grade 6800/63)

Itís still not clear to me if computer is an improvement over Shigaclone: in some ways itís seems better (mostly when it comes to technical side of a sound) but in some ways itís still behind. I find the system to be a bit on a bright side and lacking smoothness I so much enjoy with a CD player. But all the changes I did recently improved computer playback substantially and I donít have problem listening to it all day long.
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Old 17th January 2009, 03:31 PM   #2505
josephgewing is offline josephgewing  United States
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Default Two rectifier boards and one transformer

Peter,

WHY is it inadvisable to use one transformer with two rectifier boards?

I have 8 channels to supply 8 drivers in my Orion speakers. How many transformers and rectifier boards do I need? What configuration.

Thanks for your help.

Joe
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Old 17th January 2009, 04:22 PM   #2506
Peter Daniel is offline Peter Daniel  Canada
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It has to do with returning currents which are split into two diodes and that can cause noise in some setups. When done carefuly, it works without problem though.

The amp in a picture below has one 300VA trafo, 2 separate bridges and 4 channels:

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Old 17th January 2009, 04:52 PM   #2507
EUVL is offline EUVL  Europe
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Different Caps for Bass and treble ??


Patrick
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Old 17th January 2009, 05:02 PM   #2508
Peter Daniel is offline Peter Daniel  Canada
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Yes, I'm using BG N 100/50 for higs/mids and BG STD 1000/50 for bass.
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Old 17th January 2009, 05:38 PM   #2509
okapi is offline okapi  United States
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Hi peter,

with the above amp, what is the input impedance?

thanks
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Old 17th January 2009, 06:14 PM   #2510
Peter Daniel is offline Peter Daniel  Canada
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In the amp above, each channel is wired separately (4in/4out) so the impedance of a single channel is 22k.
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