Alternator Regulator Circuit

This alternator regulator uses a 3-transistor dc amplifier, and is designed for a pulled up field system, where one side of the alternate field returns to the +12-Vsupply, and the other end is pulled toward ground.
Alternator Regulator Circuit - schematic

The circuit monitors the state of the battery through a resistive divider and causes the voltage to change at the field terminal.

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