Hi all,

I am working for weeks now and finally it begins to look like it won't have to take too long now before it will come to live

I haven't found many pictures about the Dual Mono config of the Buffalo III so I thought let's fill that gap here.

Please tell me if I'm heading the right way.

I am waiting for the transformers (3x 9V, 2x 15V) for over weeks now. But I have good hope they will arrive early next month.
Also I haven't got room anymore for the extra trafo I'd planned to place so I'll stick with 4 in totall.

The module on the left is the Hypex Softstart module. This module supplies a Bus Connection fot the trafo's and a circuit for the on/off button.
Above the softstart I hope I will have some room left to place the future AC2.

For the grounding I use a 'Star of Stars'
The Trafo's will be clustered together, the both HDBP's and the Signal grounds of the IVY, Ventus, DAC's and the S/Pdif Mux.

The RH DAC is feeding the Sidecar an the Sidecar is feeding the S/Pdif Mux. Also this one is the Master for the Vollume Control and Source Selection.
The LH DAC will feed the Toslink Module and is Slaved via the I2C.

From the Sidecar I've splitted the Clock's to the LH an RH DAC.

The Ventus' are now hooked up to draw power from the IVY's but I will re-route them to the direct powersupply of the HDBP's.

The yellow/black wires are connected to the SE output of the IVY. I am thinking about using a Twisted Pair here and connect one wire of the pair together with the ground. The XLR connectors will be situated right above the Ventus'.
I will have to use the same SE output as for the Ventus for the signalling to the XLR. Again, I might consider to use a twisted pair here unless someone can tell me that's absolutely not necessery. I will, on the other hand, use twisted pairs for the transport of the signal from the Ventus to the Headphone Jack.

Best regards,

Jordo


Ok, how do I add pictures here?....

Edited by user Saturday, January 21, 2012 3:01:48 AM(UTC)  | Reason: Not specified

It is possible you will have locking issues because TTL I2S/SPDIF cable are long. Try to have it as short as possible.

I think you meant I2S there...

It would be better to have the two dac assemblies nect yo each other, and the sidecar assembly im front of them. This would mean a rethinking of the transformer/psu layout.

Another option would be stacking the dac assemblies, if you have the case height to allow it.

Ok, I mix things up between I2C and I2S!

The I2C was the black/white/gray line of approx 20cm but that won't be an issue.

The problem is that the brown/orange I2S lines are a bit too long.
They are both 10cm now.

Here in my next set up I'm pushing the limits a bit further.
I now stacked the S/Pdif module (with the Sidecar stacked) on the both DAC's.
The heigth is a bit critical now but I will winn 5mm if the wooden plate will be removed in the final setup.

This setup provides even more ground space.
The I2S lines can be cut to 7cm.
The I2C will be 11cm.

Will that do the trick?

Edited by user Monday, January 23, 2012 10:47:46 AM(UTC)  | Reason: Not specified

Hi thx!

Ok, ik can do that.
I could give them approx 6-7mm spacing from each other. Spreading them out toghether with the Softstart module.

When the trafo's will finally arrive than I hope I would have approx. 1cm towards the front for spacing with the DAC's.

I have vantilated covers.

I just won another centimeter over the Clock wire bij placing the Sidecar on the other supports. Now the DIN connectors are in line ;)

Edited by user Monday, January 23, 2012 11:40:49 AM(UTC)  | Reason: Not specified

O, that's just an easy way for me to provide a Toggle On/Off (Standby/ Power On) circuit.
I don't really need the rush-in limiter normally used for heavy transformers. But there is also a powerbus provided for the distribution of the power inlet to the transformers.

Here you can see that I have been working on the Clock and data transfer lines from de Sidecar to the DAC's.

The lines are now between the 6,5-7 cm.

You may have problems with the I2S lines injecting noise into the power supply lines. Should be easy to test.

You could just use the included ribbon cables if you had to, I guess...

Another option would be to route the power from a different source location. The Vd lines at the header are directly connected to the Vd input terminals, so if it would help, you could tap it from there.

The Sidecar itself has also got a header for the VD instead of the VD via the DIN connector.
The Sidecas has a VD, B and GND connection.

What is B and do I have to connect the GND to the Signal Star ground?

I'm going to work with ground stars. I make a star for the transformers, one star for the HDBP's and one star for the grounds of the IVY's and Ventus'. Would it be wise to connect the GND of the Sidecar also to that star?