Which of the following IC does not belong to voltage regulator class ?
NE536
NE536 option is correct.
The NE536 is a monolithic FET-input operational amplifier (JFET-input op-amp with high input impedance), not a voltage regulator. It belongs to the general-purpose amplifier family, alongside devices like the LF356/LF357.
The 7805 is the standard 78xx three-terminal positive fixed regulator delivering +5 V; the 7905 is its 79xx negative-rail counterpart delivering −5 V. The LM723 is a classic adjustable precision linear voltage regulator IC introduced by Fairchild in the late 1960s that is still used as a reference for series-pass regulator designs. All three of these are voltage regulators; only the NE536 falls outside the class, making it the odd one out.
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Codes:
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