I'm looking for a circuit or schematic of a reasonably efficient biofeedback device.
This should be one that will either sound a tone or give some sort of auditory indication when a certain range of brain states have been achieved.
I had one from about 15 years ago, but that ONE file folder appears to be missing (of course) from my collection of "useless electronic thingies".
Thus far, the net has been somewhat useless, since there are only devices to purchase, not assemble. The one I originally owned was augmented somewhat from the original design.
Regards,
CC
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