Fred D... can you confirm this...

[MWP]

From a thread a while back talking about SPDIF COAX input buffers....

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?

An externally hosted image should be here but it was not working when we last tested it.

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

Thanks.

 

[Fred Dieckmann]

Yep

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

http://katalogi.iele.polsl.gliwice....-all--&ile=50&start=0&szukaj.x=41&szukaj.y=11

 

[Elso Kwak]

From a thread a while back talking about SPDIF COAX input buffers....



Is this what you meant by the above?

An externally hosted image should be here but it was not working when we last tested it.

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

Thanks.

http://www.diyaudio.com/forums/showthread.php?postid=143422#post143422

 

[MWP]

Great...
Thanks guys!