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Unformatted text preview: HW # 5 1. Speakers are designed to have an equivalent impedance of 8Ω over the audio frequencies (roughly 500 Hz – 20 kHz). For the circuit below: a. Determine the impedance, Zmatch, such that the Thevenin impedance of the circuit is equal to the impedance of the speaker, Zload at 5 kHz. Include Zmatch in the circuit when answering the remaining parts of the question. b. Calculate the value of the Norton current source c. Write an equation for the voltage transfer characteristic, H(f). d. Calculate the power dissipated by the load impedance with respect to the power generated by the voltage source in dB at 500 Hz, 5 kHz, and 20 kHz. 2. Find a) the Thevenin and b) the Norton equivalent circuit with respect to the boxed component for the circuit shown below. 3. Find a) the Thevenin and b) the Norton equivalent circuit with respect to the boxed component for the circuit shown below. 4. For the circuit below, Determine the resonance frequency. Calculate the quality factor. Calculate the resonance bandwidth. Determine the value of R1 for a circuit in which R1, a 0.5μH inductor, and 220nF capacitor are in parallel and your answers for parts a‐c remain the same. 5. Forgetting how nonideal inductors are, an engineer designed a high pass filter using a 10 kΩ resistor and a 30μH inductor. a. Determine fB for the RL filter. b. Redesign this circuit so that it is a RC circuit using the same 10 kΩ resistor . What value capacitor should be used such that the fB is unchanged ? c. Calculate the current flowing through the resistor and the voltage across the resistor in the RC high pass filter in phasor notation if the input voltage source is 1V cos(2πfBt). a. b. c. d. ...
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This note was uploaded on 07/05/2010 for the course ECE 2984 taught by Professor Meehan during the Spring '10 term at Virginia Tech.
 Spring '10
 MEEHAN
 Impedance

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