Issue with SPDIF Input Circuit by Elso and Jocko

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300_baud

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Elso, Jocko at al,

My problem is that the spdif input circuit works beautifully with my Philips 963sa DVD Player and my Emu 1212M computer soundcard, but fails to work properly with my Musical Fidelity A3 CD player. I say "fails to work properly" because it *does* work, except the SPDIF cable has to be loose in that only the signal part of the connector is left connected and the ground part is left disconnected. Does anyone know why this is happening? The Musical Fidelity worked before with the stock CS8414 input cap set up. The cd player also works with my Denon Receiver, so I know the musical fidelity is working properly.

Thanks,
300_baud

Edit: This is the schematic i'm using: http://www.diyaudio.com/forums/attachment.php?s=&postid=44053&stamp=1026982395
 
tubenut

tubenut

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Joined 2002
croak.co.za
Musical Fiddle Tea as some technician friends call it often has odd ideas that may sound good in some applications but are not always universally compatible.....

One friend called their Odysseus amplifier the Audacius.... He found this beast to have too much feedback applied sending the amplifier into oscillations....

Anyway, just a guess but have you checked for DC on the MF digital out....

The denon used to "test" and isolate the problem is probably designed safe with either a transformer or cap blocking DC.....

G
 
3

300_baud

Member
Joined 2004
Jocko: I just read in the thread that you were somewhat involved with the schematic. Don't take it the wrong way if I misunderstood you :)

Tubenut: I've measured the DC offset from the Musical Fidelity A3, and it reads 0.448 volts. As per the spdif input schematic, I have input caps in between the AD8561 comparator and the CS8414. Should I have an input cap before the AD8561 instead?

Thanks
 
Elso Kwak

Elso Kwak

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Joined 2001
geocities.com/elsokwak/
300_baud said:
Elso, Jocko at al,

My problem is that the spdif input circuit works beautifully with my Philips 963sa DVD Player and my Emu 1212M computer soundcard, but fails to work properly with my Musical Fidelity A3 CD player. I say "fails to work properly" because it *does* work, except the SPDIF cable has to be loose in that only the signal part of the connector is left connected and the ground part is left disconnected. Does anyone know why this is happening? The Musical Fidelity worked before with the stock CS8414 input cap set up. The cd player also works with my Denon Receiver, so I know the musical fidelity is working properly.

Thanks,
300_baud

Edit: This is the schematic i'm using: http://www.diyaudio.com/forums/attachment.php?s=&postid=44053&stamp=1026982395
Click to expand...


You should use the improved schematic.
 

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Elso Kwak

Elso Kwak

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Joined 2001
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300_baud said:
Hi Elso,

Will the improved schematic work with my musical fidelity right away? or do i have to install an input cap before the comparator like what I did for the schematic that i used?

Thanks,
300_baud
Click to expand...

If the Musical Fidillity spits out DC you certainly need the cap before the comparator. This goes without saying if you know how this comparator thingie works.
:cool:
 
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300_baud

Member
Joined 2004
I believe in another thread, Elso stated that the "improved" spdif input circuit was more analog sounding. In this regard, I agree. The schematic I did initially was quicker sounding, and was quite dynamic. The latter is more relaxed, very analog. Kind of more on the warm side. The initial spdif input schematic was more neutral. They're both good, and it depends on what the end user wants.
 
tubenut

tubenut

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Joined 2002
croak.co.za
I have heard several of their products sounding good. By no means all, but a few years ago (10+) a lot of their stuff I had contact with sounded very good for the money. Midfi stuff like the A1, B1, A120 and the Kermit the Frogg cd player... (A portable in an A1 case with tubes ecc88 I think running at 40 volts or less). Sounded good at the time for the money.

The new kit is hardly represented here in South Africa so I have no experience with it.

Guillaume
 
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