Comparator

Comparator circuits look at 2 input voltages. The output state of the comparator is determined which voltage is higher.

LM393 dual comparator integrated circuit non inverting demonstration circuit schematic symbol and pin layout by electronzap
LM393 dual comparator integrated circuit non inverting demonstration circuit schematic symbol and pin layout by electronzap
Open collector output discharge terminal illustrated diagram by electronzap electronzapdotcom
Open collector output discharge terminal illustrated diagram by electronzap electronzapdotcom

The LM393 integrated circuit (IC) is a commonly available dual (2 circuits in one IC) comparator.  They have open collector outputs.

  • + pin V greater than – pin V = High output.
  • – pin V greater than + pin V = Low output.
  • Open collector output means that the output connects to ground while low. but it does not provide a positive voltage while high. It is like a switch that is turned off when it is high.
  • A pull up resistor can be used to provide positive output voltage while the output is high.

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