What I need to do is sense if the AC voltage is between about 10V and 120V. It doesn’t actually need to measure at all, I need a simple on or off. Also the upper limit isn’t really needed either.
Basically, I need to know if there AC voltage is above or below 10V or so (this number isn’t set in stone).
To make things complicated: must be a simple digital on or off. No analog, i2c, spi etc.
Space is also limited, so minimal component count is ideal. This project is contained and inaccessible so isolation from mains is not needed, but if its practical would be preferred.