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3rd March 2005, 03:20 PM
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diyAudio Member
Join Date: Jan 2004
Location: Eindhoven
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S/Pdif coax out besides opto
Hi,
I've build a USB soundcard with an opto out. Now I would like to add a coaxial output. The driving IC delivers 3,3V with a max output current of 10 mA. Can I then simply connect a 75Ohm resistor to a 6,6:1 transformer? Some designs incorporate a resistor over the transformer at the output side (before the 75Ohm resistor). Why is that? Thanks in advance, Remco Poelstra |
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