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Download ETEE3211 Fall 2005 Test #1
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ETEE3211 Fall 2005 Test #1 Name:__________________ Show all work. Clearly indicate final answer(s). 1. (50 pts) Assume no resistor, RF, is used in the circuit below and the transformer is a 4:1 center tapped transformer with a 120Vrms 60Hz input. Assume the minimum voltage allowed at the regulator input is 14V: a. What value of Ri would be needed to maintain 10V across a load whose current varies from 50mA to 200mA? b. What value of capacitor is needed in the regulator in order to maintain a minimum voltage of 14V? 2. (30 pts) For the circuit to the right, sketch the output voltage, vo, when the input voltage vs=9sint V. Assume the VON of the diode is 0.6V and Rf=0. 3. (20 pts) A silicon diode is placed in a circuit and is operating at 85oC. At 25oC, the diode has a 0.68V drop. What is the voltage drop of the diode when in the circuit? Extra Credit: (20 points max) What type of circuit is needed to obtain the waveforms shown below? Assume the input is 10sint V. Draw the circuits and label them.