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f-alpha.net » Electronics » Basic Circuits » Schmitt Trigger » Let's go... » Experiment 5 - Voltage Comparator

Experiment 5 - The Voltage Comparator

A voltage comparator compares two voltages and returns as a result which voltage is higher.

Consider the circuit with the LM311 voltage comparator...

Circuit diagram voltage comparator.

 

Voltage comparator circuit. (Enlarge)

Turning on the potentiometer P1...

  • If the voltage at the (+) input is greater than that at the (-) input, LED1 remains dark.
  • If the voltage at the (+) input is smaller than that at the (-) input, LED1 lights up.

The switch-on and switch-off points coincide...

The voltage comparator is therefore not a Schmitt trigger!

How do you turn a voltage comparator into a Schmitt trigger...?

Note

You find more information about the LM311 and more voltage comparator circuits under the topic "comparator".

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