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Unformatted text preview: MASSACHVSETTS INSTITVTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science 6.002 - Electronic Circuits Fall 2000 Homework #8 Handout F00-041 Issued 10/26/2000 - Due 11/3/2000 Readings: Exercise 8.1: Chapter 10 , Exercise 1 0.24 , assuming RC time constants are small (on page 5 75 ). Problem 8.1: LemE.Tweakit Lem E. Tweakit, a junior in course VI, wants to control his dorm-room lights from his personal computer. He proposes to use a data line from the parallel port on the computer to control the lights, because it is easy to write a program that controls the signal on the parallel port. A TTL parallel port is guaranteed to put out a HIGH signal of greater than V OH = 2.4 Volts and it is guaranteed to put out a LOW signal of less than V OL = 0.4 Volts. However, the lights are 110 Volts at 60 Hz AC, so of course, he cannot directly control the lights from the parallel port. Lem wants to use a relay to work the lights, but the only relay that Lem has in his junkbox is requires 100 mA to reliably close the switch. Unfortunately the only relay that Lem has in his junkbox is requires 100 mA to reliably close the switch....
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