Discussion
What is line regulation?
Answer: D
Line regulation is how much the output moves when the input moves, and in a shunt regulator it is set by the ratio of the diode's dynamic resistance to the series resistor. Load regulation is the response to load change, temperature coefficient the response to heat, and ripple factor a separate measure. Each specification isolates one influence, and quoting the wrong one is a common way to make a supply sound better than it is. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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