The software was revised to include multiple menus by pressing a button. This allows the operator to control settings like tolerance of the desired value vs. the read value and reaction time for the realays. It also includes a calibration sequence that saves values into EEPROM to be accessed during the main routine.
A switching mode power supply was used to power the controller and power the pair or relays needed for the actuation of the motor.
As can be seen in the video the autotransformer is now a voltage stabilizer. The voltage feedback loop allows it to turn the voltage up or down depending on the set point. A quick search for an autotransformer similar to this one priced at ~$800. A voltage stabilizer with similar characteristics to this one costs about $4,000.