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|18th December 2012, 04:17 PM||#1|
Join Date: Oct 2011
New Design: remote controlled DAC
Merry Christmas to all!
(so called because it's based on Wolfson chipsets)
* 1x SPDIF input
* Stereo Line level outputs
* Digital attenuator with mute function
* All controlled via an old Apple Remote - just a single LED on the front panel to display power & remote command.
The design is split into two boards: WolfDAC and WolfBrains. The former contains the SPDIF receiver, DAC and pre-amp. It's about the size of a pack of fags. The latter is dinky, containing an MSP430 micro with IR receiver and LED. 10way IDC cable connects the two together. Both circuits fit onto single-sided PCBs using a combination of SMD (1206 size) and through-hole. Using solder paste, it's quite simple and straight forward to construct.
This design has been a while in the making. I got the first revision together in feburary, but been plagued with a couple of problems (especially software glitches which I've only just ironed out). Been running at home connected to a Tripath class-D board for a while.
The last glitch is the pre-amp circuit. This is a 3rd order Butterworth to drop out any remaining hysterics from the DAC. However, the gain is a little mucked up - would appreciate any analogue experts to cast their eyes over it (I am definitely not an analogue expert!)
Software-wise, I've included the TI CCS project. MSP430's are dead easy to program and you can pick up the programming kit for a couple of quid (MSP430 launchpad).
I've not included the gerbers because theres still a couple of tweaks to iron out from original prototype.
Enjoy and have a Merry Christmas...
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