ps11 - UNIVERSITY OF CALIFORNIA College of Engineering...

This preview shows pages 1–2. Sign up to view the full content.

College of Engineering Department of Electrical Engineering and Computer Sciences EE 42 / 100 Problem Set 11 Spring 2008 1. A capacitor C 1 is used to power a model airplane, represented in the circuit diagram below by resistor R 1 . Initially the capacitor is charged to voltage V 1 . Calculate the fraction r of the initial energy remaining on the capacitor when the current i 1 has decreased to 3 4 of its initial value. 2. In the circuit below C 1 represents a touch sensor. The comparator controls the position of the switch as follows: Whenever V o reaches the value V re f , the switch is set to position a . After V o drops to zero, the switch is set to position b . Touch is detected by measuring the frequency f o at which the switch position changes from position a to position b . (a) Derive an analytical expression for f o . Assume that the operational ampliﬁer is ideal. Suggestion: sketch

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

ps11 - UNIVERSITY OF CALIFORNIA College of Engineering...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online