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Low-cost audio power amplifiers often avoid direct coupling of the loudspeaker to the output stage because any resulting dc bias current in the speaker can use up (and thereby waste) its limited mechanical dynamic range. Unfortunately, the coupling capacitor needed can be large! But feedback helps. For example, for an 8ohm loud speaker and fL=100Hz, what size capacitor is needed?Now, if feedback is arranged around the amplifier speaker so that a closed-loop gain Af=10V/V is obtained from an amplifier whose open-loop gain is 1000V/V, what value of fLf results? if the ultimate product-design specification requires a 50Hz cutoff, what capacitor can be used?
Calculate the E-field generated at all points by concentric spheres of surface charge that are centered at the origin. Assume that inner and outer sphers have radii ra and rb and surface charge densities Psa and Psb, respectively.
During an all-night cram session, a student heats up a 0.491 liter (0.491 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.7 °C, and the beaker is filled to the brim.
Design a five section high pass lumped element filter with 1 dB equal-ripple response, a cut-off frequency of 1 GHz and an impedance of 50 Ohms. Plot the amplitude and phase response of the filter.
given the equation: τ=(t2-t1)/ln(v1/v2) and need to derive this equation: v(t)=(const)(e-t/τ) in order to do so. How to derive the second equation properly to get the first equation
find values of resistance, voltage, and current for total and all 3 voltage drops where only certain information is given out of three voltage drops info given total voltage is 12v, resistance 1 is 2.2KO, resistance 2 is 1.6KO, and resistance 3 is..
What happens to the program counter (PC) when a subroutine is called. What register is used to keep track of the return point. What happens to the register that keeps track of the return point if a subroutine calls another subroutine
A Gaussian random process having a mean value of 2 and a variance of 4 is passed through an ideal half-wave rectifier. a) Let Xp (t) represent the random process at the output of the half-wave rectifier
Calculate: a. The rated primary and secondary currents b. The secondary voltage if it is connected at full load of 2000 kW c. The voltage regulation from no-load to full load. Voltage regulation is given by: (E(no-load)-E (full-load))/E(full-load)..
A six pole,60 Hz synchronous motor is connected to an infinit bus of 15 KV through a transmission line.The synchronous reactance of the motor is 5 ohm ,and the inductive reactive reactance of the transmission line is 2 ohm
A continuous time system is described by y(t) = t tan(x(t)). The continuous time system is sampled every T seconds to obtain a discrete time system y[n]. determine the mathematical expression for y[n].
A 360 nm thick film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with monochromatic light.
The profits per unit of solutions per unit of solutions A and B are $8 and $10, respectively. The daily demand for solution A lies between 30 and 150 units, and that for solutions B between 40 and 200 units. Find the optimal production amounts of ..
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