Discussion
Which of the following IC does not belong to voltage regulator class ?
Answer: D
The IC that is not a voltage regulator is NE536.
The other three are standard voltage regulators. The 7805 is a three-terminal fixed positive regulator giving +5 V. The 7905 is its negative counterpart, giving -5 V. The LM723 is the classic adjustable precision regulator, used with external resistors and a pass transistor to give a range of output voltages and currents.
The NE536 does not belong to the regulator class, so by elimination it is the answer. The 78xx and 79xx numbering is itself a guide: 78 for positive and 79 for negative fixed regulators, with the last two digits giving the output voltage.
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