This post explains for the regulator.
The Part Number is MAA723 ( = LM723 ).
The function of this semiconductor is Voltage Regulator.
Manufacturer: Tesla
Image
Description
The MAA723 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.
A voltage regulator is an electronic device that is used to maintain a constant voltage level, regardless of changes in load or input voltage.
Block Diagram
Features:
1. 150 mA output current without external pass transistor
2. Output currents in excess of 10A possible by adding external transistors
3. Input voltage 40V max
4. Output voltage adjustable from 2V to 37V
MAA723 PDF Datasheet
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