R448 voltage regulator of a sealed electronic devices, by adjusting the excitation current in order to stabilize the output voltage of the brushless generator.
Generator output voltage is adjusted by using the voltage adjustment potentiometer on the AVR. Cutting excitation current is accomplished by switching off the supply power to AVR.

Voltage sensing 5VA insulated transformer with input voltages taps at:
Terminals 0-110V=95-140V
Terminals 0-220V=170-260V
Terminals 0-380V=340-520V
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