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Old 25th July 2013, 08:49 AM   #3501
AndrewT is offline AndrewT  Scotland
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Ste,
the low pass filters are correctly set up to achieve LR4.
The high pass have an error in that the 47k is not equal to 100k/2 This will change the Q of the filters
100k in many of the filters will give rise to avoidable noise.
You have 3 cascaded +6dB gain stages on all the outputs. This is an extra +18dB of gain. Do you need any of that extra gain? This will create avoidable noise.
You have no RF filtering on the input.
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Old 25th July 2013, 01:30 PM   #3502
stewin is offline stewin  Kenya
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hi andrew thanks for the reply. pls can you draw a schema or circle and replacement components in the schema with m.s. paint, with the correct values or if you are using eagle i have attached the .sch and the brd files

Last edited by stewin; 25th July 2013 at 01:37 PM.
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Old 26th July 2013, 11:09 AM   #3503
AndrewT is offline AndrewT  Scotland
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You have 100k & 47k in the high pass filters.
For a Q=sqrt(2) to give a Butterworth roll-off you should have 100k & 50k.
Cascading two Butterworth 2nd order filters is what gives you the LR4.

Compare to your low pass filters. You have single and double capacitors for that exact 1:2 ratio that is needed for the correct Q.
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Old 18th August 2013, 07:11 AM   #3504
Foxx510 is offline Foxx510  Australia
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My dcx has started to do the digital input cs8420 notch filter bug every time I use it lately. The ribbon cable doesn't seem to be the cause, even though that was faulty and causing dropouts before i reseated it. As far as I can tell there isn't an easy fix for this bug, is there? It's about to go out the window and be replaced with a minidsp.
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Old 18th August 2013, 07:42 AM   #3505
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Quote:
Originally Posted by Foxx510 View Post
My dcx has started to do the digital input cs8420 notch filter bug every time I use it lately. The ribbon cable doesn't seem to be the cause, even though that was faulty and causing dropouts before i reseated it. As far as I can tell there isn't an easy fix for this bug, is there? It's about to go out the window and be replaced with a minidsp.

well 2 ways,1 get a dac board off ebay and patch it in or 2 replace the chip,
I stood the board vertical and brushed the legs(pins) with a small torch ,the chip will fall off when it gets legs hot enough ,or cut the legs and pull them off one at a time ,A used motherboard is a good practice before the real deal,
works as it should now ,might also replace the caps around that area with oscons,Good luck!
NS
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Old 18th August 2013, 08:56 AM   #3506
Foxx510 is offline Foxx510  Australia
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Cheers NS. I have an old Ebay DAC here that uses a CS8416. What's involved in patching that in to the dcx? Thanks heaps for the help :-)

Edit: similar to this? http://freerider.dyndns.org/anlage/i..._IMGP2541.html

Last edited by Foxx510; 18th August 2013 at 09:12 AM.
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Old 18th August 2013, 03:56 PM   #3507
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Quote:
Originally Posted by Foxx510 View Post
My dcx has started to do the digital input cs8420 notch filter bug every time I use it lately. The ribbon cable doesn't seem to be the cause, even though that was faulty and causing dropouts before i reseated it. As far as I can tell there isn't an easy fix for this bug, is there? It's about to go out the window and be replaced with a minidsp.
if your unit does go south, PM me. I need a PS for my DEQ2496.
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Old 18th August 2013, 04:10 PM   #3508
Ryssen is offline Ryssen  Sweden
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Hey,I got 1 or 2 PSUs....
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Old 18th August 2013, 04:23 PM   #3509
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Hey,I got 1 or 2 PSUs....
Please PM me w/detail$ Tony
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Old 18th August 2013, 07:04 PM   #3510
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Quote:
Originally Posted by Foxx510 View Post
Cheers NS. I have an old Ebay DAC here that uses a CS8416. What's involved in patching that in to the dcx? Thanks heaps for the help :-)

Edit: similar to this? Neue Eingagsstufe fr DCX2496

I replaced the chip,but here's what I have for the add on CS board,
I did some serches and also yahoo groups got alot of info,Look up Linuxworks on this site.
here's a pic to wire it!
NS
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