Parasound D/AC-1000 tweaking

Cobra2 · 12th December 2003, 05:07 PM

I just got this old DAC in house, and plan to tweak it a bit.

I already have "K" grade DAC chip's, will implement the mandatory receiver-chip filter update, then my way of tube-rolling; swap op-amps.

Maybe a new clock too...

Anybody with experience here? ideas?

Arne K

rfbrw · 12th December 2003, 06:03 PM

If the digital filter is the SM5842, Guido Tent has a module that replaces it with the SM5847.

ray

Cobra2 · 12th December 2003, 06:12 PM

The digital filter is the older SM5813...

Arne K

Cobra2 · 12th December 2003, 06:37 PM

There also seems to be 2 versions of this DAC, one with Yamaha receiver-chip, and like mine, with CS8412....

Arne K

rfbrw · 12th December 2003, 06:41 PM

Quote:

Originally posted by Cobra2
The digital filter is the older SM5813...

Arne K

Any change to that will require more extensive surgery or the construction of a daughter board. The small size of the DF1704 and the SM5847 should make the construction of a daughter board fairly easy. You could also find out if there really is a difference between the DF1700P and the SM5813, the DF1700P being a rebadged SM5813. Lastly you could become a NOSser

and ditch the filter.

ray.

Cobra2 · 12th December 2003, 06:58 PM

I have not heard that the DF1700 is the same as SM5813...The NPC is supposed to be better...and pin-compatible...

The idea of a new type for replacement is more interesting, have sent Guido the question already...

Arne K

Cobra2 · 13th December 2003, 04:55 PM

It seems that the clock is recovered by the CS8412, and then sent to the dig. filter.
Can I just disconnect the output from the CS8412, and "inject" an external clock into the SM5813?

Arne K

rfbrw · 13th December 2003, 08:07 PM

You can do that but you might find the SM5813 out of sync with the CS8412. The correct way to do it would be to derive SCLK and FSYNC for the CS8412 from the new 256Fs clock and configure the CS8412 so that SCLK and FSYNC are inputs.

ray.

Cobra2 · 13th December 2003, 08:54 PM

I thaught so, having looked at other dac's...
But why are you clock-makers not making a clock for implementing when there is none?
I have not the time or parts making a board myself...

Arne K

rfbrw · 13th December 2003, 09:33 PM

It is such a simple circuit, they probably think it is not worth the effort.

12th December 2003, 06:12 PM	#3
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	The digital filter is the older SM5813... Arne K __________________ Ars longa, vita brevis

12th December 2003, 06:37 PM	#4
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	There also seems to be 2 versions of this DAC, one with Yamaha receiver-chip, and like mine, with CS8412.... Arne K __________________ Ars longa, vita brevis

12th December 2003, 06:58 PM	#6
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	I have not heard that the DF1700 is the same as SM5813...The NPC is supposed to be better...and pin-compatible... The idea of a new type for replacement is more interesting, have sent Guido the question already... Arne K __________________ Ars longa, vita brevis

13th December 2003, 04:55 PM	#7
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Adding clock It seems that the clock is recovered by the CS8412, and then sent to the dig. filter. Can I just disconnect the output from the CS8412, and "inject" an external clock into the SM5813? Arne K __________________ Ars longa, vita brevis

13th December 2003, 08:54 PM	#9
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Is there such a clock ? I thaught so, having looked at other dac's... But why are you clock-makers not making a clock for implementing when there is none? I have not the time or parts making a board myself... Arne K __________________ Ars longa, vita brevis


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12th December 2003, 06:03 PM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	If the digital filter is the SM5842, Guido Tent has a module that replaces it with the SM5847. ray

13th December 2003, 08:07 PM	#8
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	You can do that but you might find the SM5813 out of sync with the CS8412. The correct way to do it would be to derive SCLK and FSYNC for the CS8412 from the new 256Fs clock and configure the CS8412 so that SCLK and FSYNC are inputs. ray.

13th December 2003, 09:33 PM	#10
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	It is such a simple circuit, they probably think it is not worth the effort.

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