This circuit is first a difference amplifier that filters and attenuates the input voltage.
Next is a second order low pass filter with a Butterworth response: (Q=1/sqrt(2)). A third RC filter is set at the same (10 Hz) corner frequency.
Input under voltage ( <20 V ) and input over voltage ( >50 V ) conditions are indicated with logic signals.
The simulation can be used in interactive mode to trigger the active low voltage limits.
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