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-   -   Fred D... can you confirm this... (http://www.diyaudio.com/forums/digital-source/15535-fred-d-can-you-confirm.html)

MWP 23rd May 2003 04:03 PM

Fred D... can you confirm this...
 
From a thread a while back talking about SPDIF COAX input buffers....

Quote:

The 74HC04 must be an unbuffered part such as a 74HCU04 for the 1 Meg bias resistor to work. Change R1 from 1Meg to 50K and put a 2K (or 2.2K 5%) resistor in series with the input cap C2 and the input connection to pin 1 and R1 and you will have a very good input circuit that has a gain of about 25 and will sound better than most comparators.
Is this what you meant by the above?

http://www.overclockers.com.au/~mwp/...pdif-input.gif

And i gather this wont work with a 74HC04, i do need the HCU part?

Thanks.

Fred Dieckmann 23rd May 2003 04:42 PM

Yep
 
Thats the circuit and you need the HCU, the unbuffered part

http://katalogi.iele.polsl.gliwice.p...41&szukaj.y=11

Elso Kwak 23rd May 2003 08:05 PM

Re: Fred D... can you confirm this...
 
2 Attachment(s)
Quote:

Originally posted by MWP
From a thread a while back talking about SPDIF COAX input buffers....



Is this what you meant by the above?

http://www.overclockers.com.au/~mwp/...pdif-input.gif

And i gather this wont work with a 74HC04, i do need the HCU part?

Thanks.


http://www.diyaudio.com/forums/showt...422#post143422

MWP 24th May 2003 06:31 AM

Great...
Thanks guys!


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