This is what I was thinking of doing with an OTTO II. In my previous testing, since Right DSD connected just to D2 of right channel DAC did not play anything, I'd just connect Right DSD just to D1.

Any issues that you can see here on this crude Paint drawing? Of course I'd do equal length wires to each DAC board. Grounds not pictured for simplicity but would be connected.

Thanks Russ.

Edited by user Sunday, June 30, 2013 10:24:12 PM(UTC)  | Reason: Not specified

Thanks Russ! I'll order another OTTO II and wire it up as pictured.

Its pretty simple. Connect D1 and D2 from PCM on the B1 side, and they are routed as normal to the two DACs.

I could have simply drawn as 1B1 being connected to 3B1 and 2B1 being connected to 4B1. :) That is how I actually wired it.

It works just as shown perfectly. I have tested it.

Also one way I could have drawn it was with 1B1 connected to 1B2 and 2B1 connected to 3B2. :) Depending on the source of course. :)

But not all sources have LRCK multiplexed with DSDL and PCM Data with DSDR :) So I just did not draw it that way. :)

Edited by user Tuesday, August 27, 2013 7:11:39 PM(UTC)  | Reason: Not specified

Routing will be much better my way.

Russ, I plan use an USB input (Amanero) and a S/PDIF 4:1 MUX for others PCM inputs. I think I´ll use two OTTOs to do the work (one OTTO to switch between MUX 4:1 and the USB input, and other to switch between PCM/DSD when signal came from the Amanero). What´s the way you would do it?

Really I´m concerned about the fact the signal go through two mux and, in the case of the switch between PCM/DSD, only D1 and D2 go through the mux (BCK will be direct to the DACs). I´m afraid at the end all this routing could be in detriment of sound quality.

I didn't look closely (because I have already shown how to do it) - but OTTO-II would be better for many reasons. Not the least of which is no need to drive relays. In any case if you mimic what I have already shown using relays there is no reason it won't work. :) You will just need to transistors and diodes to properly drive the relays.

Hi Danny,

I have never tried it with sidecar - but I do think it could be made to work. you would want the OTTO-II after the sidecar in this case.

The port expander is used to get the state of the switches for configuration. Only one can be active at a time or they would conflict. You install R7 so as to make one of the port expanders idle. This simply changes it's I2C address so it does not respond.

Cheers!
Russ

Yeah me to....... so far I don't think OTTO-II can be used at all...... maybe two of it after sidecard (one for each BIII). What about D4? It is connected to D2 on the sidecard!

On Port Expander : if R7 is not installed on both cards (expanders are monitoring switches) and I am using ARDUINO to control registers, do you know if on board switches can override register settings or not?
cheers
Danny

I know that there can be only one "master blaster" to control I2C bus, however as Brian already explained in another post if my ARDUINO code ignore both BIII port expanders I don't need to worry about it. Best bet would be to unsolder L5 on both cards thus disabling expanders altogether.

Re-OTTO-II
I think I've got it: OTTO-II should work (didn't try it yet-have two relays combo instead, and OTTO-II for switching I2S between AMANERO and DENON) in position after sidecard on Left<>Right part of the flat cable where Left side need D2 and D6 signal wire to be cut and D2 from sidecard connected to 1B1 and another end (from BIII) to be connected to 1A. For D1 just strip part of insulation (continuos connection from sidecard to L_BIII) and connect this to 1B2. Similar D6 from sidecard connect to 2B1 and BIII side of wire to 2B2 and so on......boy it looks ugly. Right part of the cable is opposite to this and D1/D5 have to be cut while leaving D2/D6 continuos and just strip part of insulation.

Russ, any chance TP come up with "DUAL MONO sidecard" incorporating this in it?
cheers
Danny

scrap this. I just remember D4 have to be switched (only on Left channel) as well and this rule out OTTO-II as possible solution.....one need 3x double relays (same as on sidecard) so this brings sidecard with heavy modification the best candidate!

Edited by user Friday, October 18, 2013 4:22:12 AM(UTC)  | Reason: Not specified