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Unformatted text preview: The correct operation of this circuit must be demonstrated during the second week. 1 For the second stage use a resonant bandpass filter from Lab 3. Try the following component values: C = 0.1 F; R 1 = 159 k, R 2 = 22 k, and R 3 = 318 k For the third stage use the full-wave rectifier from Lab. 3. For the Threshold circuit use the Schmitt trigger from Lab 3 and a modified version of the peak detector as shown below. The pot sets the fraction of the rectified EEG peak that will be used as threshold for the QRS signal. This circuit should track amplitude changes in the ECG signal. + V in _ LF 356 300 kP 1 kP + _ LF 356 1 MP 330 kP 100 kP 1 MP 10 PF + V out Threshold Adjust For the display use the classic 555 timer configured as a monostable driving an LED. 2 V out V in 1 MP 555 2 3 8 4 1 5 6 7 +15 V LED +15 V .1 PF .01 PF 100 kP 330 P .1 PF 3...
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- Spring '08