Hi
I don't know what effect the inductor may have, sorry.
Assuming that the Arudino only needs a smallish current and that the input for Arduino voltage is going too high, try a voltage divider across the output from your power supply.
A Zener diode may be another option
From
https://en.wikipedia.org/wiki/Zener_diodeVoltage shifter A Zener diode can be applied to a circuit with a resistor to act as a voltage shifter. This circuit lowers the output voltage by a quantity that is equal to the Zener diode's breakdown voltage.