This post explains for the semiconductor MAA723.
The Part Number is MAA723 ( = LM723 ).
The function of this semiconductor is Voltage Regulator.
The LM723/LM723C is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA; but external transistors can be added to provide any desired load current. The circuit features extremely low standby current drain, and provision is made for either linear or foldback current limiting.
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