Cheep Mod II - a low cost platform for Euro-Rack digital audio.

Cheep Mod II

Cheep Mod II Front - fully assembled

What is it?

This is a small 6HP Euro-Rack format module with 3 CV inputs, 3 pots, Digital (Sync) input, 16-bit stereo audio outputs. It's a slight modification of the Cheep Mod I did earlier, but with a slightly more advanced MCU that provides I2S output and has more on-chip flash. One of the goals here was to test out the audio characteristics of one of the low-cost I2S DACs that are cropping up.


Software Development

The STM32 family of parts are supported by a variety of commercial IDEs, all of which are available in low-cost or limited free versions from the ST website.

I prefer to use open-source tools so I've set up a development environment based on the GNU C compiler for ARM, available for free from the Launchpad project. For downloading to the target I use OpenOCD and the ST-Link V2 SWD interface that's available on most all of the inexpensive STM32 Discovery boards. To accelerate development I also use the STM32 Standard Peripheral Library as a starting point for my code and then optimize out the heavyweight functions as required. Links to all of these are here:

Design Resources

Project Status

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Eric Brombaugh

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