Mr White's "Opus", designing a simple balanced DAC

[fierce_freak]

I've read that they're closer to 32-33 ohms. I forget the source, though.

[analog_sa]

Originally posted by Russ White
I wonder if anyone has tried using a wireless video sender (2.4 or 5.8ghz) to transmit SPDIF.

I have thought about it, but not tried it yet.

That would be a cheap easy way to do multi room audio.

Cheers!
Russ

For casual lo-fi listening? It might work. These devices have around 18MHz bandwidth which means any serious fidelity is out. It's difficult enough to make coax cables sound ok...

[analog_sa]

Originally posted by hbarki



Canare makes a 75-ohm RCA chassis jack:
http://www.canare.com/files/Cat11_p23.pdf

It has been previously discussed that these are not 75ohm in reality (outside the advertising brochures). The WBT NextGen are but only if used with corresponding male jacks. Somehow easier to use BNCs.

[Russ White]

Originally posted by analog_sa



For casual lo-fi listening? It might work.

Yeah, I had much the same thought.

[Russ White]

Originally posted by analog_sa
easier to use BNCs.

Have to agree, if true 75 ohm terminations are your aim that's what I would do.

For short cable runs its very likely not going to be critical.

[audiosteve]

You can use these to ship I2S across an Ethernet network.

http://www.atterotech.com/CobraNet-CO2-page.html

[audiosteve]

In the interest of full disclosure, I should note that I am an employee of Cirrus Logic that makes the CobraNet chips that go into the CO2 boards noted in my previous post. However, I didn't make the post to try to promote a Cirrus product, just to inform about a technology that seems to apply to the topic. I would have done the same for any other product I was aware of that is on topic. Thought I should say this to keep things on the level.

[Lucas Unger]

Russ,
for the converter you built you made a nice relay board to switch between input modules. Any chance you would want to share the PCB layout and a parts list? I would like to expand my opus with a USB board and i would prefer such a relay board over a front panel switch.

By the way, i've been happily listening to my dual mono opus for a few days now, especially imaging is truly great.

Regards,

L

[Carl_Huff]

AudioSteve please contact me offline about CobraNet. I've got a couple of questions at ... carl_dot_huff@yahoo_dot_com

[BrianDonegan]

Any chance you would want to share the PCB layout and a parts list? I would like to expand my opus with a USB board and i would prefer such a relay board over a front panel switch.

The board I used actually had an error on it (two of the I2S pins are reversed on the outputs). It also uses a relay that is not very common. We can probably redo it with something like G6H relays and fix the layout problem, then post it.