[mythtv-users] OT: Re: HDMI_SPDIF directly to reciever

[James]

OTAlen Edwards wrote:
>
>
> 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 swings
>>>>> (not recommended, but it produces sound) and I have driven SPDIF 
>>>>> signals
>>>>> successfully with 0V to +250mV swings.  Again, not recommended but it
>>>>> produces sound.
>>>>>
>>>>> Brian
>>>>>     
>>>> Am I risking frying my motherboard or receiver?
>>>>
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>>>>
>>>>   
>>>
>>> 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.
>>>
>>> Allen
>> 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).
>
>
> Allen
>
> .
>
I bought a new meter and it says 1.4V DC :-(
I put a picture up at: http://lockie.ca/test/voltage.jpg but I doubt it 
is very helpful.

So if my RX expects 5V (DC?) and it is getting 1.4V DC and I have sound, 
do I need the circuit?
TTL is +5V, and SPDIF is -.5 to +.5V so what is my MB outputting?