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Old 28th May 2009, 04:16 PM   #1
tomat is offline tomat  Indonesia
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Default digital interface transformer,help

can i directly replace the coupling capacitor on input dac ,usually 0.1uf with digital interface transformer such from audio note?
thanks ,hope anyone can help

cheers
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Old 29th May 2009, 12:20 AM   #2
tomat is offline tomat  Indonesia
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the coaxial input coupled with 0.1uf mylar capacitor to inverter ic tc74hcuo4ap ,i plan to replace that 0.1 mylar with digital interface transfrm
help please

thanks
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Old 4th June 2009, 02:19 AM   #3
Cliff45 is offline Cliff45  United States
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I'll bet this capacitor is simply used for "DC Blocking" in this application, because a excessive amount of DC bias voltage could cause any noise present on the input line to false-trigger the Toshiba TC74HC04AP CMOS inverter chip. I believe that this chip is more than likely being used as a "input buffer" for the S/PDIF input circuit, but I don't have the board schematics to look at so I am just stating the most obvious use of a chip like this one in a digital input circuit.

You should take a look at the web pages on the Scientific Conversion Inc. web site for more information on the various trade-offs of designing circuits with pulse transformers as inter-device coupling isolators. There are three papers in PDF format that are exceptionally good reading on this subject!

http://www.scientificonversion.com/

The links are on the lower part of the column on the left side of the main page.....



HTH-
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Old 4th June 2009, 05:10 AM   #4
tomat is offline tomat  Indonesia
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Thank very much for the info Mr Cliff
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