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− | + | [http://pceeg.sourceforge.net The Programmable Chip EEG] is a dual channel electroencephalograph that could be a brain-computer interface. | |
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− | + | [http://pceeg.sourceforge.net The Programmable Chip EEG] is programmable because it uses [http://opencircuits.com/Programmable_Potentiometers Digitally Programmable Potentiometers]. They are used to set the Gain, frequency range, and can calibrate multiple analog boards for different EEG tests. | |
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+ | 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. | ||
+ | * 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.) | ||
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). | 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 analog | + | 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. |
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