I want to be able to measure voltage of a battery pack which exceeds 36v. To reduce voltage to the point where it could be measured with an ADC a voltage divider can be used.
To reduce losses on a divider a large values of resistors can be used together with a capacitor to ground, which would provide the necessary current for ADC to take meaningful readings.
A pair of multiturn potentiometers of different values should allow for accurate adjustment.
I wonder.. What if to simply use fixed 0.1% resistors instead of potentiometers?
Or what if to use a pair of fixed resistors and a smaller value potentiometer at the 'bottom' to still have it adjustable..
Or perhaps there is an alternative to a voltage divider - some kind of 'high-voltage' ADC or a dedicated voltage supervisor IC?
Any suggestions are welcome.