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Yes u need a 2 voltage dividers and u can still use a zener diode tapped on the dividers as the reference voltage, the other voltage divider you can precalculate the resistor values using the voltage divider formula or use a potentiometer to vary and test the circuit, to make the comparator work u need to use a voltage regulator chip like the LM340T, sorry when off track above , use a suitable resistor in front the IC to reduce the current, enough as to not kill it, or u could use a buck converter board to reduce the voltage to the ic
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