Brain Actuated Technologies
Thomas F Collura PhD.
tom at ccfadm.eeg.ccf.org
Tue Mar 21 16:20:37 EST 1995
Brian Thiel/Lois Henry-Thiel (thielbl at primenet.com) wrote:
: > From: tom at ccfadm.eeg.ccf.org (Thomas F Collura PhD.)
: > I am initiating a project where people will share design and other
: > information, for setting up their own PC-based EEG systems, and this
: > is one of the application areas. The near-term goal is an under $200
: > system that works with Windows, to provide the basic functions.
: I am wondering about the $200 goal. It seems to me that just the electrodes,
: cables and minimal amps before you get to the analog-digital signal processing
: would consume all the money. What is the secret?
The HC11 EVBU microprocessor board with breadboard area is $120. The IC's
for the front-end are about $40-$50. That leaves $10-$20 for a battery
case and miscellaneous parts. I didn't count electrodes, although
I am making some from saline-soaked sponge for about $5 each.
It is a two-channel system. If you were thinking of 8 or 16 channels,
then definitely, it would be $20/channel for the amps alone.
I may have neglected the RS-232 cable, and one or two other things.
The Circuit Cellar HAL kit has about the same hardware, and is sold for
I think about $300 these days, which includes their markup.
So the $200 is aggressive but not unreasonable.
It does, however, assume a PC on hand.
Newer HC11 prototype boards are out there for $49 and $69, that I want
to evaluate. That could get us well below the $200 mark.
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