Mr White's "Opus", designing a simple balanced DAC - Page 53

4real · 23rd July 2007, 09:49 AM

Any comments about my earlier suggestion:

Quote:

Originally posted by 4real

Speaking about that: the USB board also has a SPDIF output. Would it be smart to link that to the new Wolfson SPDIF receiver, let it decently reclock there, and then let the data go to the DAC from there, in stead of directly linking the USB receiver to the DAC? My guess is that jitter might be reduced even further (the PCM2707 doesn't really say a lot about that though).

An added bonus might be that switching the SPDIF signal might be a lot easier that switching I2S.

DarrenWadsworth · 23rd July 2007, 05:16 PM

What would you recc. for high quality (type of wire and gauge) to use as wiring between the:

cd-player and receiver
receiver and DAC
DAC and Balanced Output Sockets
power supply (yours) and components

Thank you
Darren

BrianDonegan · 23rd July 2007, 05:50 PM

Here's what I use...

cd-player and receiver
Generic RCA cable that came with a receiver (rca to rca), then a small single pair from CAT5 cable (just cause I have a bunch)

receiver and DAC
some 24ga PVC wire I picked up (stranded)

DAC and Balanced Output Sockets
pairs from CAT5, re-wound into three wire sets instead of pairs (see reason above)
can be see here used with an embedded BETA Opus

power supply (yours) and components
some 24ga PVC wire I picked up (stranded)

DarrenWadsworth · 27th July 2007, 01:10 AM

I am building a Cd player from scratch, but am new to this.
I wanted to know where you think I should install the power switch.

Should I have it switch the HV before the transformers?
Have it Switch after the Transformers but before the PS?
Have it switch after the ps (before the DAC)?

Thank you
Darren

Variac · 27th July 2007, 01:22 AM

Before the transformers
Good Luck

fierce_freak · 27th July 2007, 09:00 PM

I've finally gotten around to doing some comparisons with the Opus. Against my Zhaolu D2.5a with a Zapfilter installed, I prefer the Opus in most cases, with the most common edge to the Zapfiltered Zhaolu being bass volume (not necesarrily quality). The Zhaolu might also do sax a little bit better, as well.

I don't have any buffer installed in my Opus at the moment...would adding something like the Zapfilter make the bass more present? My guess is that it would, but I'm relatively new to this

BrianDonegan · 27th July 2007, 09:11 PM

Are you using it with single-ended outputs?

fierce_freak · 27th July 2007, 09:20 PM

Balanced outs. The bass is there and is pretty good...I'm just a bit of a basshead

jleaman · 27th July 2007, 09:30 PM

Quote:

Originally posted by fierce_freak
I've finally gotten around to doing some comparisons with the Opus. Against my Zhaolu D2.5a with a Zapfilter installed, I prefer the Opus in most cases, with the most common edge to the Zapfiltered Zhaolu being bass volume (not necesarrily quality). The Zhaolu might also do sax a little bit better, as well.

I don't have any buffer installed in my Opus at the moment...would adding something like the Zapfilter make the bass more present? My guess is that it would, but I'm relatively new to this

Non secure webserver ?

fierce_freak · 28th July 2007, 10:05 PM

Huh?

Does anyone know where to source TORX? I need to add an optical input to my DAC but can't seem to find one of these anywhere. Also, can a simple DPDT switch be used to switch back and forth between coax and optical, or will I need a more complex circuit. Thanks, guys

23rd July 2007, 05:50 PM	#523
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	Here's what I use... cd-player and receiver Generic RCA cable that came with a receiver (rca to rca), then a small single pair from CAT5 cable (just cause I have a bunch) receiver and DAC some 24ga PVC wire I picked up (stranded) DAC and Balanced Output Sockets pairs from CAT5, re-wound into three wire sets instead of pairs (see reason above) can be see here used with an embedded BETA Opus power supply (yours) and components some 24ga PVC wire I picked up (stranded) __________________ Twisted Pear Audio

27th July 2007, 01:22 AM	#525
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	Before the transformers Good Luck __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

27th July 2007, 09:11 PM	#527
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	Are you using it with single-ended outputs? __________________ Twisted Pear Audio

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23rd July 2007, 05:16 PM	#522
DarrenWadsworth diyAudio Member Join Date: Feb 2005 Location: Tacoma, WA	What would you recc. for high quality (type of wire and gauge) to use as wiring between the: cd-player and receiver receiver and DAC DAC and Balanced Output Sockets power supply (yours) and components Thank you Darren

27th July 2007, 01:10 AM	#524
DarrenWadsworth diyAudio Member Join Date: Feb 2005 Location: Tacoma, WA	I am building a Cd player from scratch, but am new to this. I wanted to know where you think I should install the power switch. Should I have it switch the HV before the transformers? Have it Switch after the Transformers but before the PS? Have it switch after the ps (before the DAC)? Thank you Darren

27th July 2007, 09:00 PM	#526
fierce_freak diyAudio Member Join Date: Jul 2007	I've finally gotten around to doing some comparisons with the Opus. Against my Zhaolu D2.5a with a Zapfilter installed, I prefer the Opus in most cases, with the most common edge to the Zapfiltered Zhaolu being bass volume (not necesarrily quality). The Zhaolu might also do sax a little bit better, as well. I don't have any buffer installed in my Opus at the moment...would adding something like the Zapfilter make the bass more present? My guess is that it would, but I'm relatively new to this

27th July 2007, 09:20 PM	#528
fierce_freak diyAudio Member Join Date: Jul 2007	Balanced outs. The bass is there and is pretty good...I'm just a bit of a basshead

28th July 2007, 10:05 PM	#530
fierce_freak diyAudio Member Join Date: Jul 2007	Huh? Does anyone know where to source TORX? I need to add an optical input to my DAC but can't seem to find one of these anywhere. Also, can a simple DPDT switch be used to switch back and forth between coax and optical, or will I need a more complex circuit. Thanks, guys

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