1. Group N3: Digital Control Mary Nsunwara Reshun Gethers Wayne Blake

2. Project Goals Duplicate Circuit designed last semester Test New and Old Board Compare and Contrast signals acquired from both boards Find solutions to old and new problems Commence A/D Conversion

3. Building Procedure EEG Amplifier Circuit from Last Semester Reduced Accuracy and Cost of Circuit Components 5% Resistors in place of 1% Resistors 50V Capacitors in place of 400 V Capacitors Utilized Adapters to Connect Surface- Mount OP 90 Amplifier Chips to Board

4. Carbon Copy Old AmplifierNew Amplifier

5. Testing Electrical Signals generated from Blinking, Heartbeats Examination of Noise Artifacts Sensitivity of Electrode Leads Head Movements

6. Results - Blinking Old AmplifierNew Amplifier

7. Results - Heartbeat Old AmplifierNew Amplifier

8. Results - Noise Old AmplifierNew Amplifier

9. Problems Encountered Expected and Unexpected Noise Sources Head Movement Touching Electrodes Oscillation of Output Signals Caused by 60 Hz Electrical Source, E.g., Lamp Solve by Testing in the Dark

10. Final Goals Clean up Output Signals Digitize Control Data Operate a Remote Control Car