You're welcome! like the way you mounted the DAC and IVY!

Hello, I have now updated the model. This is what I want to do.

RCA (consumer level Sp-dif) +- to sp-dif mux input A +-.
BNC (consumer level Sp-dif) +- tp sp-dif mux input B +-.
Optical +- to sp-dif mux input C +-.
Optical +- to sp-dif mux input D +-.

Sp-dif mux BCK to BCK ("SPDIF 4") on Sidecar 1.
Sp-dif mux LRCK to D1 ("SPDIF 4") on sidecar 1.
Sp-dif mux DOUT to D2 ("SPDIF 4") on sidecar 1.
Sp-dif mux GND to GND ("SPDIF 4") on sidecar 1.

Teleporter 1 to "PCM/DSD" on sidecar 1.

Sidecar 1 "BUF3" to "SPDIF4" on sidecar 2 (BCK, D1, D2 and GND).

Teleporter 2 to "PCM/DSD" on sidecar 2.

Sidecar 2 "BCK" to Buffalo 2 "DCK".
Sidecar 2 "D1" to Buffalo 2 "D1".
Sidecar 2 "D2" to Buffalo 2 "D2".
Sidecar 2 "GND" to Buffalo 2 "GND".

Buffalo 2 stacked on Ivy3.

Ivy3 R27-R30 replaced by jumpers. Out L+- and Out R+- connected to XLR 4 pin Chassis connector ("balanced" Beyerdynamix T1).
Ivy3 Out L+-/R+- Through resistor R27-30 to Sidecar 3 and 4 ("PCM/DSD").
Ivy3 Out L and Out R SE to Sidecar 3 and 4 ("PCM/DSD").
External XLR and RCA connected to Sidecar 3 and 4 ("SPDIF 4").

The ground will not be switced in my setup with both SE and XLR switching.
I connected the dac to the "PCM/DSD" to be able to have protection against a
possible failure of the arduino controller at startup wich could cause damage to the
rest of my system (full volume on half the dacs).

The arduino controller will send a "I`m ok signal" to the triggers of sidecar 3 and 4 when it has
started and set volume and so on. The external source is a Surround reciever (will be replaced
with a balanced processor eventually). The XLR connectors wil be the front left/right (Audiophysic Virgo V) and the RCA will switch subwoofers (Audiophysic Rhea2).

Power and control signals are not included here. Possible shields placed between modules will be connected to chassis gnd
with wires to a common point(star ground).
Control will be done from the arduino. Power to the modules are:

1 Placid HD BP for the Ivy / legato.
1 Placid HD for the Buffalo 2 with tridents.
1 LCDPS for arduino / lcd.
1 LCDPS for the other modules at the input. The sidecar`s from one half, and the other modules from the other half.
I will have three transformers. One for analog (15V x 2) one for control (9Vx2) and one 9Vx2 for the last LCDPS.

It will be a tight fit. Any suggestions?
Are there any reason this will not work (I am not an engineer so any input is welcome)?

Best
Gunnar

Edited by user Saturday, May 5, 2012 6:13:26 PM(UTC)  | Reason: Not specified

The Sidecar 3 + 4 switch between Surround processor (when not energized) and the DAC (when "I`m Ok signal" is sent from the arduino).
The Sidecar 3 + 4 will also be switched off, when I select a Surround-pass through mode on the arduino (9+2 speakers wired as if the dac was never there).
The signal to the headphones will still be the dac, so this will also serve as way to mute speakers when listening to headphones.

I made a temporary front plate and started on the internal structure work. Lots to do, not much time to do it... At least the end is "in sight".

Some others also seem to have some difficulties with the optical module. If you look at the Buffalo DAC pages you'll find multiple topics with more or less the same issue.

It's not your poor eyesight, but all problems with the optical modules seem to be related to the B3.

Hello Brian, thank you for the reply.

I have totally forgotten the dip switches since I started with the arduino. That dip switch is proborably still used?
Will test and proborably get a lock later today :)

Thanks a lot Corpius. The modified code is great :D

Edit: I now have added code for triggering the sidecar.

Pin6 give 5V when I select the first input (exaU2I).
Pin6 give 0V when I select the second input (Toslink from HDMI switch).

Edited by user Sunday, May 20, 2012 12:08:41 AM(UTC)  | Reason: Not specified

Thank you. Will do :)

Here is the code I altered a little from glt`s

switch (value){
case 0:
lcd.print(no0);
digitalWrite(7, LOW); //GW-B2 Turn off relay (Sidecar 2)
digitalWrite(6, HIGH); //GW-B2 Turn on relay (Sidecar 1)
break;
case 1:
lcd.print(no1);
digitalWrite(6, LOW); //GW-B2 Turn off relay (Sidecar 1)
digitalWrite(7, HIGH); //GW-B2 Turn on relay (Sidecar 2)
break;
case 2:
lcd.print(no2);
digitalWrite(6, LOW); //GW-B2 Turn off relay
digitalWrite(7, LOW); //GW-B2 Turn off relay
digitalWrite(8, LOW); //GW-B2 via resistor to cs8416mux terminal 1
digitalWrite(9, LOW); //GW-B2 via resistor to cs8416mux terminal 0
break;
case 3:
lcd.print(no3);
digitalWrite(6, LOW); //GW-B2 Turn off relay
digitalWrite(7, LOW); //GW-B2 Turn off relay
digitalWrite(8, LOW); //GW-B2 via resistor to cs8416mux terminal 1
digitalWrite(9, HIGH); //GW-B2 via resistor to cs8416mux terminal 0
break;
case 4:
lcd.print(no4);
digitalWrite(6, LOW); //GW-B2 Turn off relay
digitalWrite(7, LOW); //GW-B2 Turn off relay
digitalWrite(8, HIGH); //GW-B2 via resistor to cs8416mux terminal 1
digitalWrite(9, LOW); //GW-B2 via resistor to cs8416mux terminal 0
break;
case 5:
lcd.print(no5);
digitalWrite(6, LOW); //GW-B2 Turn off relay
digitalWrite(7, LOW); //GW-B2 Turn off relay
digitalWrite(8, HIGH); //GW-B2 via resistor to cs8416mux terminal 1
digitalWrite(9, HIGH); //GW-B2 via resistor to cs8416mux terminal 0
break;
}

I will proborably have to add a delay command while I am still changing between sp-dif and i2s.
The above code will be used to switch between the 6 inputs I have planned in the model. The dac board then only see a i2s signal so there should be no need for the "i2s-sp-dif" switch sequence.

2 sidecars with teleporters
4 sp-dif via the cd8416mux if I can get it working again. I most likely fried the chip with static a while back :/

You should use a level shifter. A simple voltage divider to get ~3.3V should work.