Editing Programmable Chip EEG
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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: | |
− | The | + | * The digital POT made by analog devices ([[AD5204]]) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. |
− | The | + | * The differential analog signals are amplified by the [LT1114] opamp. |
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− | + | * Then the signal is amplified and conditioned by high pass and low pass filters. | |
− | + | The common mode signal is inverted summed and sent back to the body to decrese common mode signal thsi is done by the driver right leg circuit. | |
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− | + | Band reject filters may be added soon in the future. | |
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− | + | Then the analog signals are simultaniously digitized and the digital values can be clocked to the digital board. | |
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