[mythtv-users] HDMI_SPDIF directly to reciever
allen.edwards at oldpaloalto.com
Sat Jul 5 05:09:12 UTC 2008
James Lockie wrote:
> Alen Edwards wrote:
>> James Lockie wrote:
>>> Brian Phillips wrote:
>>>> I think I can say why yours is working correctly.
>>>> Your signal is a purely electrical SPDIF signal. Even though it's not
>>>> according to the -0.5 to +0.5 spec, it works because SPDIF is pretty
>>>> versatile. I have driven SPDIF signals successfully with 0V to +5V
>>>> (not recommended, but it produces sound) and I have driven SPDIF
>>>> successfully with 0V to +250mV swings. Again, not recommended but it
>>>> produces sound.
>>> Am I risking frying my motherboard or receiver?
>>> mythtv-users mailing list
>>> mythtv-users at mythtv.org
>> You certainly are risking frying the receiver. If that goes, there
>> is a small chance it could take out the MB.
>> Build the network or buy the adapter.
> Yamaha said my receiver expects 5 volts.
> ASRock never answered (that was a month ago).
> There is 0 volts on the RCA.
> Why do I get sound if there is a zero volt signal?
> I tested my voltmeter on a battery to verify it works.
You should read 0 volts with a S/PDIF signal. They are 0 volts DC and
the AC is too high a frequency for my and apparently your voltmeter to
read. If you had a TTL signal, you would register about 2 volts with
the VM set to DC. If your RX expects 5 volts and your MB reads 0, I
would guess it would work and you won't hurt anything (don't sue me, I
can't pay anyway).
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