Table of Contents
Non inverting op amp comparator circuits have an output that looks more like the signal voltage than the reference voltage. Comparing which one is higher or lower, and then outputting as close to the rail voltage that it can, in the direction of the signal voltage, compared to the reference voltage.
- A fixed voltage is applied to the inverting (-) input. In the diagram, it is half of whatever the supply voltage (Vcc) is (in relationship to ground). The – input voltage only changes if the supply voltage changes.
- The adjustable voltage (signal) is applied to the non inverting input (+).
- A higher + input voltage than the – input results in a high output.
- Lower + input voltage than the – input results in a low output.
- LM358 output
- Is pretty much 0V ground when low.
- About 1.5V shy of the positive supply when high.
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