Difference between revisions of "Programmable Chip EEG"

From OpenCircuits
Jump to navigation Jump to search
Line 4: Line 4:
  
 
Parts used in the PCEEG:
 
Parts used in the PCEEG:
* [[LT1168|LT1168 Programmable-Gain Precision Instrumentation Amplifier]] is used to amplify the weak electric signals coming from the brain through electrodes attached to the scalp, etc.
+
* [http://opencircuits.com/LT1168 LT1168 Programmable-Gain Precision Instrumentation Amplifier] is used to amplify the weak electric signals coming from the brain through electrodes attached to the scalp, etc.
 
* Several [[LT1114|LT1114 Low Power Precision OP-Amps]] are used for amplification and filtering of the signal
 
* Several [[LT1114|LT1114 Low Power Precision OP-Amps]] are used for amplification and filtering of the signal
 
* The [http://opencircuits.com/Digitally_Programmable_Potentiometers Digitally Programmable Potentiometers AD5204] 4-Channel Digitally Controlled Potentiometer is used to make calibration of this device easier.  (Historically, a weak point of homebrew designs has been their sensitivity to component value; tolerance and drift have made them require constant tweaking for good results.)
 
* The [http://opencircuits.com/Digitally_Programmable_Potentiometers Digitally Programmable Potentiometers AD5204] 4-Channel Digitally Controlled Potentiometer is used to make calibration of this device easier.  (Historically, a weak point of homebrew designs has been their sensitivity to component value; tolerance and drift have made them require constant tweaking for good results.)

Revision as of 10:16, 20 July 2006

The Programmable Chip EEG is a dual channel electroencephalograph that could be a brain-computer interface.

The Programmable Chip EEG is programmable because it uses Digitally Programmable Potentiometers. They are used to set the Gain, frequency range, and can calibrate multiple analog boards for different EEG tests.

Parts used in the PCEEG:

To reduce noise in the readout of the analog part of this circuit, a common-mode feedback is passed back into the body by the driver right leg circuit. Band reject filter may also be used (to reject, for example, 60Hz noise from nearby A/C power wiring).

The resulting analog signals will be passed into a digital circuit, based on the Cypress PSoC microcontrollers, which will digitize the signals, further process them, and provide an interface to a computer.