In situations where an accidental change in a potentiometer setting can cause catastrophic problems, change the potentiometer out for fixed resistors.
Make a resistor substitution board ahead of time to use it to determine what the values of these resistors should be.
All the standard resistor values (SMD 1026) have been placed on the substitution PCB.
One end of all the resistors are common and would represent the wiper on a potentiometer.
Female headers on the other side of the resistors would be the top and bottom terminals of our potentiometer.
In the images below, a $1.00 DC to DC Boost regulator is connected to a 12-volt computer fan.
Input to the regulator is 5-volt.
