No wonder people can't hear the difference...
 

"Glenn Richards" wrote in message
. uk...
Eiron wrote:

This one?
A56AK
http://www.maplin.co.uk/Module.aspx?...34128&doy=28m7

Yup, that's the beast! Was £2 cheaper in store...

Thanks for pointing me in that direction. I bought one, not that I'm too
bothered about "bit perfection" for the application, but I needed an SPDIF
output from a laptop, and that seemed the easiest and cheapest way.
Unfortunately I needed a co-ax output rather than an optical one, but a
74HCU04, a couple of resistors and a phono socket sorted that.

David.

No wonder people can't hear the difference...
 

"Bob Latham" wrote in message
...
In article ,
David Looser wrote:

[Snip]

Unfortunately I needed a co-ax output rather than an optical one, but a
74HCU04, a couple of resistors and a phono socket sorted that.

Could you point me at any info on that please?

The logic-level SPDIF signal, as present at the drive pin of the optical
transmitter, is buffered by one section of the 74HCU04. The output of that
section drives three other sections in parallel. The outputs of those
sections are connected, via individual 1K resistors, to the output phono
socket. A 100 ohm resistor is connected across the output socket. The chip
(DIL) is mounted on a tiny off-cut of double-sided veroboard (groundplane on
the top). A 100nF X7R ceramic capacitor is connected as physically close as
possible between the chip's power pin and the groundplane.

OK, that's actually 2 resistors and one ceramic capacitor more than I said
above.

Hope that helps

David.