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Old 6th February 2008, 11:52 PM   #1
Ryssen is offline Ryssen  Sweden
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Default Optical 2 S/pdif converter?

I have optical out on my sattelite reciver and am going to use it on a s/pdif mixer,is there a converter?DIY maybe.
I am not going to open the reciver,I want it outside...
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Old 7th February 2008, 12:10 AM   #2
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I think it's as simple as powering an optical receiver and connecting it to your SPDIF input. See how Russ White does it:

http://www.twistedpearaudio.com/imag..._schematic.jpg
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Old 7th February 2008, 12:43 AM   #3
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Simple as that?Hmm,maybe if I open the case and take the signal before the transceiver it becomes even simpler?
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Old 7th February 2008, 12:50 AM   #4
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ooooh oooh oooh
ground loops with a satellite receiver???

I think this is the perfect application for optical!!
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Old 7th February 2008, 01:08 AM   #5
Ryssen is offline Ryssen  Sweden
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Ok,I will try the outside circuit...
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Old 9th February 2008, 11:04 PM   #6
Jambo is offline Jambo  United Kingdom
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Quote:
I think it's as simple as powering an optical receiver and connecting it to your SPDIF input.
Pretty much, except that the output from the optical receiver will be TTL (probably 3.3V) and a coaxial SPDIF input won't be wanting an input as high as that. It would probably be fine, but to be on the safe side use a potential divider to drop it down to ~1V.
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Old 10th February 2008, 12:38 PM   #7
Ryssen is offline Ryssen  Sweden
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Ok,then I have to take the impedans (75 ohm) in the equation?
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Old 10th February 2008, 03:25 PM   #8
Jambo is offline Jambo  United Kingdom
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Ideally, yes.

I worked out the following, I'm pretty sure it's right for a source impedance of 75Ohms, but please someone correct me if I'm wrong...

Click the image to open in full size.

Obviously you'll need to choose the nearest standard values to those, and also make sure that your optical receiver is happy with the relatively low impedance.

Hmm, actually the more I look at this the more I think that the transmission line will only 'see' R2 and as such R2 should be 75ohms, rather than the combination of R1 and R2 being 75 ohms, anyone? If that's the case then you need R1 to be around 170ohms.
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Old 10th February 2008, 07:16 PM   #9
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No, the output impedance of your circuit is R1 in parallel with R2. You had it right the first time.
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Old 10th February 2008, 09:35 PM   #10
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I thought so... thanks
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