Dual-limit-microvolt-comparator

  
When the upper or lower limit is exceeded, the LED lights up. Positive feedback to one of the nulling terminals creates 5 to 20 p,V of hysteresis on both amplifiers. This feedback changes to offset voltage of the LT1002 by less than 5 p,V.
Dual-limit-microvolt-comparator - schematic

Therefore, the basic accuracy of the comparator is limited only by the low offset voltage of the LT1002.




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