Simplified-voltage-level-sensor

  
This circuit uses only one JC, either 1, LM393 dual comparator or 1/z, LM339 quad comparator. RV1 and RV3 set the full scale reference voltage, and RV2 and RV4 set the switching thresholds to a value between 0 V and the full-scale reference.
Simplified-voltage-level-sensor - schematic

The change in input voltage needed to fully switch the output state is less than 0.05 mV (typical).




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