shunt

The crude diagram represents a current limiting ("dim bulb") setup. The mains pass through a DPST light switch, then onto a duplex outlex, where the bridge between the Line terminals has been broken. The box at the top (4 circles) represents a power strip which allows various bulb combinations...

I have a common inverting integrators made using opamp (capacitor in negative feedback, +input to GND). I would like to have all these integrators saturate at the same exact voltage. Adding a zener diode in parallel to the cap works, but zeners are 2% tolerance at best and temperature dependent...