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Peter VanDerWal wrote:
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cite="mid:4779.72.211.171.214.1215193763.squirrel@www.vanderwal.us"
type="cite">
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<pre wrap="">Why do I get sound if there is a zero volt signal?
I tested my voltmeter on a battery to verify it works.
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Not every mobo produces TTL levels on the S/PDIF header. Some produce -.5
to +.5
My ASUS S/PDIF module has no components between the RCA connetor and the
mobo header, just wire and PCB traces.
Since it produces the correct levels, it must be doing in on the mobo.
To answer your question. Assuming the output is swinging between -.5 and
+.5 the average DC voltage is zero. If your voltmeter is set for DC then
it will read 0V. Set it on AC and it will probably indicate something
near 1V
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My Voltmeter read something like 2 volts DC on my ASUS M3A MB. I
would look again for something on that module. Perhaps they are very
small surface mount components. Set to AC, it didn't register.
Frequency probably too high for the voltmeter.<br>
<br>
Anyway, that is how I knew that my MB was putting out TTL levels and
the circuit described worked great.<br>
<br>
Allen<br>
<br>
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