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

[BrianDonegan]

USB Module, DAC, Ballsie stack with supplies, getting ready to test the Ballsie out. Tested configs will be:

Balanced out, no filter (balanced output buffer)
SE out, no filter (Bal-SE converter/buffer)
Balanced out with Filter (filter/buffer)
SE out with filter (convert/filter/buffer)

[Russ White]

Just wanted to show my test rig using a uC to control the Opus. Basically it just initializes it and sets the volume via IR (phillips RC5). I also coded a mute function. It will also have rotary encoder(gray code) input as well.

This was just for kicks. Later I will interface the Opus with uber controller.

I have the DAC directly DC coupled to a TXO-2. This sounds freakin incredible.

Cheers!
Russ

[Dougie085]

Any idea when that LCD controller kit is going to be ready? I'm very interested in that thing

[Russ White]

Originally posted by Dougie085
Any idea when that LCD controller kit is going to be ready? I'm very interested in that thing

Well what you see there is really a hacked up Joshua Tree Controller.

Controlling the DAc is actually wicked easy if you can program a PIC. There are just 5 registers, and they are actually pretty intuitive.

I can send the code to anyone who is interested. It not yet perfected, for instance I have not used the interrupt pin effectively yet. But it is certainly serviceable and will get you going in the right direction.

Cheers!
Russ

[Dougie085]

Well I heard you were releasing a LCD controller sometime. Thats what I was curious about.

[Russ White]

Yes that is coming soon, probably the next few weeks I will have a PCB to play with.

[Dougie085]

Going to be building a preamp of some sort soon and very interested in your LCD controller. I'm guessing its a selector as well.

[fierce_freak]

Has anyone been able to get optical in functioning? I looked at the data sheets for my torx receiver and the cs8416 reference board to figure out how to hook it up. I've got the output of the torx going through a .1 or .01 uF x7r cap (forget which) and connected to the receiver side of C4 (easiest spot I could find for input directly to RX0). It doesn't work, so I thought I'd try to get some ideas here (yes, I have a voltage regulator using the proper circuit to power the torx).

[BrianDonegan]

I think you want to just tie the TORX output to the regular S/PDIF input (+) and GND.

[DarrenWadsworth]

Originally posted by Russ White


We are working on a I2S multiplexer for sharing multiple sources with a single DAC , its not done yet, but for now you could also just use a 4 pole switch.

The chain for USB could just be the USB module(very good but not optimal), or USB -> Opus DAC.

Good luck!

Cheers!
Russ

Russ,

I am new and was looking for the complete from input to whatever to the switch, to dac (or..?) eventually to the analog output. I want to share the OPUS.

Originally posted by Russ White


The chain for USB could just be the USB module(very good but not optimal),

Not sure what you mean by this.

Thank you for your time,

Darren