CURRENT ISSUE
Contests
Test your eq
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Issue #222 January 2009
Problem 1—There’s a standard way to hook-up a resistor and a PNP transistor to boost the current capacity of a three-terminal linear regulator, as shown below. How does this circuit work, and how do you select the value of the resistor?
Problem 2—What effect does this circuit have on the quiescent power consumption of the regulator, which might be important in battery-powered applications?
Problem 3—What is the difference between “/” and “\” in a Universal Resource Identifier (URI)?
Problem 4—Some web pages contain URIs that contain “\” characters where they should have had “/” for path separators. What should a browser do with these?
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