High Voltage ADC Measurements using a PIC and OpAmp
You may want to put a protection diode on the input of the op amp, the high voltage could easily burn up the op amp if it somehow crossed the barrier of the resistor. Take care while routing, sometimes through hole parts can be advantageous to avoid arcing and to provide separation as creepage and clearance for 100V is 0.71mm. 







simulate this circuit &ndash; Schematic created using CircuitLab