Fred D... can you confirm this... - diyAudio
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Old 23rd May 2003, 04:03 PM   #1
MWP is offline MWP  Australia
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Default 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?

Click the image to open in full size.

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

Thanks.
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Old 23rd May 2003, 04:42 PM   #2
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Thats the circuit and you need the HCU, the unbuffered part

http://katalogi.iele.polsl.gliwice.p...41&szukaj.y=11
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Old 23rd May 2003, 08:05 PM   #3
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Default Re: Fred D... can you confirm this...

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?

Click the image to open in full size.

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

Thanks.

http://www.diyaudio.com/forums/showt...422#post143422
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File Type: gif f-interface-sm.gif (16.6 KB, 221 views)
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Old 24th May 2003, 06:31 AM   #4
MWP is offline MWP  Australia
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Location: Adelaide, South Australia
Great...
Thanks guys!
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