I'm trying to measure Mains AC voltage of 230V RMS/50Hz with the ADC of a MCU. Therefore I need some isolation and voltage division (+/-325Vp down to +/- 1V).
The voltage division is easy to solve, but for the isolation I was thinking about using a Common mode Choke.
The idea is to use the Common mode choke as a small transformer, by connecting it to the Mains power (230V RMS), in series with a resistor.
On the secondary side I would place a resistor, and hopefully the voltage across this resistor would be dependent on the 230V RMS.
But can I use a Common mode choke in this way (at 50Hz)? These chokes are normally for RF.