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?



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

Thanks.

[Fred Dieckmann]

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

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

[Elso Kwak]

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



Is this what you meant by the above?



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]

Great...
Thanks guys!