I have this circuit for having measurements like with a multimeter diode function.
The ADS1115 result is reported to PC software and stored in a database for later reference comparison.
I could protect the ADC INPUT by Zener diode and op-amp buffer. but if the user measures two points carrying voltage higher than 3.3V, the 3.3V regulator will destroyed.
How can I protect my circuit against that scenario?
I want to keep the 3.3V at the measurements probes so I could not use a diode which will lower down that voltage at the probes end.