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