The Programmable Chip EEG BCI 
The downloads link should have the newest Eagle Cad board and schematic
files & parts lists.
Analog to Digital Converter &
Right Leg Driver
Analog to Digital Converter & Right Leg Driver
If you intend to build
a PCEEG it is helpful to know about the Analog to Digital Converter
& Right Leg Driver board.
- The analog to digital converter changes the analog signal
from the intstramentation amplifier to a digital output
signal.
- The right leg driver circuit is where many
amplifier board circuits common signals are summed and inverted though
the Right Leg Driver circuit & sent back to the body to cancil
out common voltages. This ground point could be a ear lobe.
- Their also is a 3 Volt to 5 Volt level converter that is to
communicate between the A-D converter that outputs 3 volts digital and
the microcontroler that runs at 5 volts.
- Their is a 2 Volt refrence source that is buffered
& filtered on this board also to setup a center
voltage point for the circutry.
The downloads link should have the newest Eagle Cad board and schematic
files & parts lists.
Parts List New
Design
Parts List
Old Design
Refrence Designs & Ideas:
- Open EEG mailing list
- Modular EEG
- Monolith EEG
- Arduino
- Boarduino
(Thanks modular eeg designers for this warning document.)
Made 2008/09/07
by Joshua Wojnas, the open source community, modular EEG, monolith EEG,
Arduino, Boarduino & the design & designers of
thowse
projects.
