A recent question on the Electrical Engineering Stack Exchange site got me thinking about some interesting window comparator circuits. Here’s how to detect three different input voltage levels with just one op-amp!
References and additional reading:
|Simplified window comparators||Applications of Operational Amplifiers, Third-Generation Techniques, Jerald G. Graeme, Chapter 4.1.2|
|Tri Level Voltage Detector||LVM821 Datasheet, Texas Instruments, Section 8.2.3|