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When we discussed the work of Galvani and Volta, we noted that Galvani's work was not fully appreciated until the development of instruments capable of detecting and amplifying the small biopotentials present in living organisms. Think about the cell models we have discussed in this course, and the experimental work of researchers like Hodgkin and Huxley. Describe an experiment that Galvani could have performed to help convince physicists like Volta of the existence of "animal electricity."
What are the impedances of an inductor and a capacitor (of any value) at a frequency of 0 Hz (DC) and at infinite frequency. Once we know what they are , how can this information help us in analyzing a circuit.
Sketch the complete Nyquist diagram for the following open-loop transfer function. Determine the effect of K on the closed-loop stability. Explain how the "shortcuts" contribute to the diagram.
A box contains 50 diodes of which 10 are known to be bad. If the first diode drawn from the box was good, what is the probability that a second diode drawn will be good
a. Sketch the spectrum of the sampled signal up to 20 KHz. b. Sketch the recovered analog signal if an ideal (brick wall) low pass filter with a cutoff frequency of 4 KHz is used to filter the sampled signal in order to recover the orig..
Frequency multiplers are used at the transmitter to bring up the frequency level to the transmitter level frequency. Why don't we use the crystal oscillator to generate the transmitter level frequency
Consider a signal x(t) = 10 cos(2pi*fct + 4 cos 2pi*fmt). Assume frequency modulation. The message frequency fm = 2:3 kHz. Calculate the modulation index and find the bandwidth when.
A three-phase induction motor has been tested, and has small stator resistance. At 230 V, 60 Hz, the motor produces 40 N-m at 1740 RPM.a) Given a 40 N-m load, input of 115 V and 30 Hz, what operating speed do you expect
Draw the logic diagram for the following Boolean expressions. The diagram should correspond exactly to the equation. Assume that the complements of the inputs are not available. a.) XYZ+X'Y'+X'Y'
A balanced three-phase load is connected to a balanced three-phase supply via a transmission line. What must be the readings on the two wattmeters, the ammeter, and the voltmeter
use GPS and they are useful for many reasons. GPS receivers use signals from more than three satellites so that cheap quartz clocks can be used instead of expensive atomic clocks. The quartz clocks tend to drift up to + or -1 ns/s.
A binary waveform of 53000 bits/sec is converted into an 8192 level waveform that is passed through a channel with a raised cosine-rolloff filter characteristic with r = 0.33. The channel bandwidth is what
Given a DSP system in which a sampling rate of 8000 Hertz is used and the antialiasing filter is a second order Butterworth low pass filter with a cutoff frequency of 3.2 KHz determine a. The percentage of aliasing level at cutoff frequency
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