improving cs8412/14 lf jitter attenuation

Reina · 26th November 2005, 03:44 PM

hi,

the most impressive result of tuning my parasound d/ac-1600hd was this mod. the sound is clearly more powerful and agile, but low jitter sources still sound better. i would like to encourage all cs8412/14 user to try this mod, if they have not-tuned-clock-devices.

by default only high-frequency jitter is strongly attenuated by the cs8412/14. with the following mod jitter attenuation over the entire audio range is achieved. the settling time increased to round about 1 second, but who cares ? no synch problems with pc and cd-player digital optical out @44.1/48khz and 44.1khz cd-player cinch was flashy.

[schematic attached]

Reina · 26th November 2005, 03:45 PM

n.t.

Calimero · 26th November 2005, 04:16 PM

you use separate supplies for analog and digital supplies of CS8412 as well as a decent SPDIF input. Let us know to assess if your advise is worse trying.

If you don't have, separate supplies for VD and VA, doing so will give you a big improvement, especially if you use a decent (low noise) reg.
I have good results with the reg101-5 (for each) as close as possible on the supply pins.

Same accounts for the SPDIF-input.

Henk

Jocko Homo · 26th November 2005, 05:27 PM

Playing games with the RC vlaues will lower the corner frequency. At the risk of severe overshoot in the response.

IOW.......while it is tuned to a lower frequency, and takes longer to settle, it probably does so because it is underdamped and swings back and forth a few times.

Jocko

Reina · 26th November 2005, 07:02 PM

>At the risk of severe overshoot in the response.

I have still no low-jitter clock ready. my best source is a sony cdp-50xaes cd-player and its digital-out sound quality with this mod is improved. maybe the sound quality is slightly decreased when using a tuned low-jitter-clock+hq-out-device. that is still not tested.

even a single 47 uF BG-NX as filter cap is working great and sounds better than the 2 x 0.47 uF BG-NX alone. i tried to lower the r to 330 ohm, which was working for some days without problems also.

greetings.

CheffDeGaar · 27th November 2005, 06:13 AM

Long ago, Pete Goudreau experimented some values for the filter caps :

Here (7th §)

Also here

And finally here

Worth reading

Elso Kwak · 27th November 2005, 04:19 PM

Ever heard of the Wildmonkeysects loop-filter?
No monkey-business pls [joke]
http://db.audioasylum.com/cgi/m.mpl?...sects&session=

Reina · 27th November 2005, 06:35 PM

many thanks for the links, CheffDeGaar and Elso!

but it seems, that nobody tried a electrolytic as filter cap before. that is strange, cause a small electrolytic has less inductance than a big foil capacitor. i came to good results with unpolar black gate nx. but maybe a small rubycon za or even a simple tantalum could make a good job also ?

snowman · 13th December 2005, 03:54 PM

good!

maxlorenz · 14th December 2005, 02:58 AM

Reina:
I risk non friendly answers by asking this, but i lack knowledge and instruments to test it myself (i only tested "by ear"

) :

I have used the superE-cap configuration ( a pair of non-polar BG's in antiparallel way) with success in A and D power supply (save once that I got audible ringing

)
Have you experience with this?
It will only cost you the price of another BG-NX to test it

(I hope Jocko is not around

)

Good luck.
M

26th November 2005, 04:16 PM	#3
Calimero Banned Join Date: Aug 2003 Location: A farm on the prairie (protcted from foxes)	I can not tell from schema, that you use separate supplies for analog and digital supplies of CS8412 as well as a decent SPDIF input. Let us know to assess if your advise is worse trying. If you don't have, separate supplies for VD and VA, doing so will give you a big improvement, especially if you use a decent (low noise) reg. I have good results with the reg101-5 (for each) as close as possible on the supply pins. Same accounts for the SPDIF-input. Henk

27th November 2005, 06:13 AM	#6
CheffDeGaar diyAudio Member Join Date: Feb 2003 Location: This Universe, I think	Long ago, Pete Goudreau experimented some values for the filter caps : Here (7th §) Also here And finally here Worth reading __________________ /Cheff - Falling feels like flying, until you hit the ground

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26th November 2005, 05:27 PM	#4
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Playing games with the RC vlaues will lower the corner frequency. At the risk of severe overshoot in the response. IOW.......while it is tuned to a lower frequency, and takes longer to settle, it probably does so because it is underdamped and swings back and forth a few times. Jocko

26th November 2005, 07:02 PM	#5
Reina diyAudio Member Join Date: Jun 2005 Location: Berlin	>At the risk of severe overshoot in the response. I have still no low-jitter clock ready. my best source is a sony cdp-50xaes cd-player and its digital-out sound quality with this mod is improved. maybe the sound quality is slightly decreased when using a tuned low-jitter-clock+hq-out-device. that is still not tested. even a single 47 uF BG-NX as filter cap is working great and sounds better than the 2 x 0.47 uF BG-NX alone. i tried to lower the r to 330 ohm, which was working for some days without problems also. greetings.

27th November 2005, 06:35 PM	#8
Reina diyAudio Member Join Date: Jun 2005 Location: Berlin	many thanks for the links, CheffDeGaar and Elso! but it seems, that nobody tried a electrolytic as filter cap before. that is strange, cause a small electrolytic has less inductance than a big foil capacitor. i came to good results with unpolar black gate nx. but maybe a small rubycon za or even a simple tantalum could make a good job also ?

13th December 2005, 03:54 PM	#9
snowman diyAudio Member Join Date: Mar 2005 Location: macau	good!

14th December 2005, 02:58 AM	#10
maxlorenz diyAudio Member Join Date: Oct 2003 Location: osorno , Chile	Reina: I risk non friendly answers by asking this, but i lack knowledge and instruments to test it myself (i only tested "by ear" ) : I have used the superE-cap configuration ( a pair of non-polar BG's in antiparallel way) with success in A and D power supply (save once that I got audible ringing ) Have you experience with this? It will only cost you the price of another BG-NX to test it (I hope Jocko is not around ) Good luck. M

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