Comparator

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

Comparator integrated circuits (ICs) are just intended to look at 2 input voltages, and respond to which one is a higher voltage than he other.

Open collector output discharge terminal illustrated diagram by electronzap electronzapdotcom
Open collector output discharge terminal illustrated diagram by electronzap electronzapdotcom

The LM393 is a commonly available dual comparator (2 of them in one component) integrated circuit. It has 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. Instead, a pull up resistor is used to provide the positive voltage while the output is high.

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