[mythtv-users] SPDIF Brackets building them for sale

[Adilson Oliveira]

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David George escreveu:

> 
> Your receiver must be tolerant of 5v input then.  The S/PDIF spec says 
> the data should be 1v peak to peak.  The PC output is usually TTL level 
> which is 0v to 5v.  This is why the capacitor resistor circuit is used.  
> The only requirement is that the PC must have enough current output to 
> drive the circuit.  If it doesn't you will need to use a more 
> complicated circuit that includes a buffer chip.
> 
> Also, there is an error in the capacitor/resistor circuit I posted 
> yesterday.  The capacitor should be 100nF as Adilson wrote.
> 

I was about to answer exactly that, you just beat me :)
I believe I wrote in a previous email that I made a mistake when I first
built this adapter and the TTL line was connected directly to my Denon
receiver resulting in a fried port. Fortunately, the only thing that was
actually damaged was a circuit board track and a diode so I was able to
repair it.
IIRC the board in discussion was the ASUS M2NPV-VM. For that it works
fine. It's the one I have here.

[]s

Adilson.
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