brain machine
This is an improved version of Mitch Altman’s Brain Machine.The hardware is based on an ATMega8.It uses only very few of the I/O ports: two for audio, two for LEDs, one for a pushbutton, so it should be easy to use another controller that has an 8bit timer with two PWM channels (OCxA, OCxB).Add a piece of prototyping PCB, four capacitors, two resistors, a switch, connectors for headphones and glasses, and two AA cells, and you’re done.
   brain machine
Full description at brain machine website
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