[Fpga-synth] Stereo Audio Interface

[Magnus Danielson]

Eric and the list,

Sorry for the stand-still, but someone else fucked up the Mailman 
installation. An hour, a cup of coffie and some homebaked apple pie 
later it works and there is a new bug-report on Debian.

Eric was also kind enought to friendly ask if this was allowed on the 
list. I think this DIY-level kind of sharing is tolerable as I have a 
long tolerance from the Synth-DIY community and have supported (and 
still does) the ASM-1 synth.

Eric Brombaugh wrote:
> Hey List -
> 
> I've designed a little I2S stereo audio codec board that will plug into 
> the 6-pin Digilent I/O connectors found on the S3Esk or Avnet S3A 
> boards. It's a very simple circuit - basically a 10-pin SMD with 
> 24-bit/196kHz specs and simple passive line-level outputs on a 3.5mm 
> jack. I did an initial prototype on grid board which worked nicely, so 
> I've designed a PCB, sent it off for fab and should have 5 prototypes 
> ready to test in a few weeks. Cost looks like about $20 or so for small 
> quantities.
> 
> I'm curious if there's any interest in the FPGA-synth community for 
> this. If I can get commitments for >20 units or so I'd be willing to 
> have a batch built up.
> 
> Let me know off-list if you're interested and I'll tally up the quantity 
> to report back if we've got a project or not. If so, I'll put up a web 
> page with further details on the design, how to integrate it and how to 
> get one.

As I have already indicated to Eric offlist, I would be interested in a 
pair. I have also agreed on porting Erics Verilog code to VHDL so that 
both worlds can enjoy this.

I would also enjoy seing the counterpart, a stereo 24-bit ADC/192 kHz 
showing up eventually.

While 3.5 mm stereo-jack is good enought for easy listening, I would try 
to fit some other jacks to it eventually. But that's the audio pro 
within me speaking.

Cheers,
Magnus