Available as either a kit of parts or an assembled / tested unit here.
Updates since the article was written may also be found here.
The latest firmware & project file packages may also be downloaded here.
 

The mixer experimentation kits are ready for sale.  A full set of experimentation firmware with all sorts of user options in the code are available, for both the basic 8-channel mixer with knobs and the full-featured 8-channel mixer with DSP.  Test and debug firmware are both available for both CY8C27443 and CY8C29466 28-pin PSoCs.  All of these test project files & firmware is included on CD with every kit order, or can be downloaded on the page linked above.

The mixer kits make use of slightly different components than the article experiments used; mainly, 10k potentiometers are used for adjustment and their charge circuits have appropriate resistor & capacitor values to compensate.

First half: Oct 2008

Circuit Cellar Author Q&A
Chris Paiano – Author of Circuit Cellar Article Series "PSoC Design Techniques" (Circuit Cellar 216 and 217).

"My first MCU-based design was a universal direct replacement electric motor controller for golf carts. Coincidentally, this was also my first PSoC project. It consisted of a control PSoC that regulated current through an array of FETs to the motor with a closed loop, which communicated via infrared (directed through a fiber-optic cable) to a custom display application I wrote for the Palm family of handheld PDAs. This Palm handheld could be mounted to the golf cart dashboard or used for handheld diagnosis of the control unit. It would display information such as throttle position, battery voltage, motor current, tachometer reading, approximate speed in MPH, and any active errors. I had an electric go-cart that I used as a development test bed for this project. Testing was quite fun."

-More-

Second half: Nov 2008
(coming soon!).

Coming soon!