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design a microphone preamplifier for a publuc address amplification system. The output signal from a magnetic voice coilmiscrophone typically has an output resistance of 100 ohms and apeak value of about 10mV under normal speaking conditions. Yourcircuit should amplify the microphone signal to a 1-V level forinput to the systems power amplifier and should include a volumecontrol to adjust the microphone signal over the complete rangefrom zero to maximum. To help reduce the coupling of 60 Hz noisesignals from power wiring into the microphone, the input resistanceof the amplifier should match the output resistance of themicrophone. Note that including a variable resistor orpotentiometer on the input side of the circuit is not a good ideabecause any electrical noise generated by the wiper arm will beamplified by the preamplifier circuit and fed in amplified form tothe power amplifier.
A listener increases his distance from a sound source by a factor of 4.11. Assuming that the source emits sound uniformly in all directions, what is the change in the sound intensity level in dB
Use rail voltages of +/-15V. Sketch the circuit diagram and the voltage transfer characteristic (Vout vs Vin) Discuss how you chose the values of the components and comment on how accurately you think you can achieve the specification.
1. Find the volume of a frustum of a pyramid with square base of side 17, square top of side 9 and height 14.2. The base of a solid is a circular disk with radius3. Parallel cross sections perpendicular to the base are squares.
Two random variables have zero mean and variance of 16 and 36. Their correlation coefficient is 0.5. A). find the variance of the sum. B). find the variance of their difference C). Repeat (a) and (b) if the correlation coefficient is -0.5
A message signal 0.01e^(-5000*t^2) phase modulates a carrier signal 3 cos(240000 pi t) with a modulation constant 600*sqrt(e). (a) Determine the expression, the power, and the bandwidth of the modulated signal.
A process has dynamics G(s)=1/(4s^s+s+1). Apply a unity negative feedvack controller of the form G.c(s)=1/(s+b). (a) Report the transfer function T(s) of the closed-loop system. (b) Report T(s) to 2nd order and report the reduced transfer function T..
Consider the following signal y[n]; y[n] = X1[n+3] * X2[n] The signals X1 and X2 are defined as X1[n]=((1/2)^n) u[n] X2[n]= ((1/3)^n u[n] Determine the Z transform of y[n].
The problem has two parts(a and b) and it asks: Find the power and rms value of each of the following signals: a) x(t) = 5 + Ccos(ωot+θ) b) x(t) = 2+7cos(1/2t+θ1)+3cos(2/3t+θ2)+5cos(6t+θ3)
determine that the total field B within the sample is one tesla. Calculate M and determine what percentage of the volume now consists of domains with magnetization parallel to the field.
A capacitor in an RC circuit with R = 5.00 ohm and C = 6.00 mF is being charged. What is the time required for the capacitor voltage to reach 86.5 percent of its steady-state value
In a circuit, there is a resister, a conductor and a capacitor connected to voltage source. R = 25 ohms, L = 20 milliH, and C = 50 microF. a) Find the total impedance of the network if the frequency is 60 Hz.
(a) A Ge bar 0.1 cm long and 100 m2 in cross-sectional area is doped with 1×1017 cm-3 gallium. Find the current at 300 K with 10 V applied. (b) Upon a steady illumination uniform excess carriers are generated in the Ge bar.
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