LM393 Voltage Comparator Circuits

The comparator component has 2 inputs that monitor the voltage delivered to them. One input is called the – (inverting) input, and the other is called the + (non inverting) input.

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  • Noninverting input voltage > Inverting voltage = High output
  • Noninverting input voltage < Inverting input = Low output

The comparator’s output goes high (close to the rail + voltage) when the non inverting input (+) is at a higher voltage than the inverting (-) input. Whereas, the comparator’s output goes low (close to the rails – voltage), when the non inverting (+) input has a lower voltage than the non inverting input (-).

LM393 Non Inverting Comparator Demonstration Circuit With A Manually Controlled Trimpot Signal video below Click here to watch directly on YouTube!

LM393 Non Inverting Comparator Demonstration Circuit With A Manually Controlled Trimpot Signal diagram by electronzap electronzapdotcom
LM393 Non Inverting Comparator Demonstration Circuit With A Manually Controlled Trimpot Signal diagram by electronzap electronzapdotcom

LM393 Inverting Comparator Demonstration Circuit Trimpot Controlled by Electronzapdotcom video below: Click here to watch directly on YouTube!

LM393 Inverting Comparator Demonstration Circuit Trimpot Controlled diagram by electronzap electronzapdotcom
LM393 Inverting Comparator Demonstration Circuit Trimpot Controlled diagram by electronzap electronzapdotcom

Video below: High temperature alarm electronics circuit step by step build LM393 comparator NTC thermistor buzzer Click here to watch directly on YouTube!

LM393 Comparator High Temperature Alarm using Thermistsor plus Active Buzzer and 2N2222 or other NPN Bipolar Junction Transistor BJT diagram by electronzap electronzapdotcom
LM393 Comparator High Temperature Alarm using Thermistsor plus Active Buzzer and 2N2222 or other NPN Bipolar Junction Transistor BJT diagram by electronzap electronzapdotcom


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