USB Mixer

Status: Working but abandoned

I wanted a 3-channel stereo mixer for the school bus. I realized a fully analog one would just be tasteless and would also require stereo potentiometers. Instead, I found the PT2258 (for $1) 6ch i2c volume controller (1dB increments). It is controlled by a PIC18F2455, which would no longer require stereo pots. It's then trivial to mix the signals with some really cheap opamps.

The PIC18F2455 also has USB. I didn't need it, and didn't really want it, but why not make it controllable by USB? The 18F2455 was the cheapest (not 40-pin PDIP) chip I had lying around that supported i2c master mode in hardware.

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